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1.
The convergence of heterogeneous wireless access technologies has been envisioned to characterize the next generation wireless
networks. In such converged systems, the seamless and efficient handoff between different access technologies (vertical handoff)
is essential and remains a challenging problem. The heterogeneous co-existence of access technologies with largely different
characteristics results in handoff asymmetry that differs from the traditional intra-network handoff (horizontal handoff)
problem. In the case where one network is preferred, the vertical handoff decision should be carefully executed, based on
the wireless channel state, network layer characteristics, as well as application requirements. In this paper, we study the
performance of vertical handoff using the integration of 3G cellular and wireless local area networks as an example. In particular,
we investigate the effect of an application-based signal strength threshold on an adaptive preferred-network lifetime-based
handoff strategy, in terms of the signalling load, available bandwidth, and packet delay for an inter-network roaming mobile.
We present an analytical framework to evaluate the converged system performance, which is validated by computer simulation.
We show how the proposed analytical model can be used to provide design guidelines for the optimization of vertical handoff
in the next generation integrated wireless networks.
This article is the extended version of a paper presented in IFIP Networking 2005
Ahmed H. Zahran is a Ph.D. candidate at the Department of Electrical and Computer Engineering, University of Toronto. He received both his
M.Sc. and B.Sc. in Electrical Engineering from Electronics and Electrical Communication Department in the Faculty of Engineering,
Cairo University in 2002 and 2000 respectively, where he was holding teaching and research positions. Since September 2003,
he has been working as a research assistant in the Department of Electrical and Computer Engineering, University of Toronto
under the supervision of Professor Ben Liang. His research interest is wireless communication and networking with an emphasis
on the design and analysis of networking protocols and algorithms.
Ben Liang received honors simultaneous B.Sc. (valedictorian) and M.Sc. degrees in Electrical Engineering from Polytechnic University
in Brooklyn, New York, in 1997 and the PhD degree in Electrical Engineering with Computer Science minor from Cornell University
in Ithaca, New York, in 2001. In the 2001–2002 academic year, he was a visiting lecturer and post-doctoral research associate
at Cornell University. He joined the Department of Electrical and Computer Engineering at the University of Toronto as an
Assistant Professor in 2002. His current research interests are in the areas of mobile networking and wireless multimedia
systems. He is a member of Tau Beta Pi, IEEE, and ACM and serves on the organization and technical program committees of a
number of major conferences each year.
Aladdin Saleh earned his Ph.D. degree in Electrical Engineering from London University, England. Since March 1998, Dr. Saleh has been working
in the Wireless Technology Department of Bell Canada, the largest service provider of wireless, wire-line, and Internet in
Canada. He worked as a senior application architect in the wireless data group working on several projects among them the
wireless application protocol (WAP) and the location-based services. Later, he led the work on several key projects in the
broadband wireless network access planning group including planning of the IEEE 802.16/ Wimax, the IEEE 802.11/ WiFi, and
the integration of these technologies with the 3G cellular network including Mobile IP (MIP) deployment. Dr. Saleh also holds
the position of Adjunct Full Professor at the Department of Electrical and Computer Engineering of Waterloo University, Canada
since January 2004. He is currently conducting several joint research projects with the University of Waterloo and the University
of Toronto on IEEE 802.16-Wimax, MIMO technology, interworking of IEEE 802.11 WLAN and 3G cellular networks, and next generation
wireless networks. Prior to joining Bell Canada, Dr. Saleh worked as a faculty member at different universities and was Dean
and Chairman of Department for several years. Dr. Saleh is a Fellow of IEE and a Senior Member of IEEE. 相似文献
2.
This paper presents a new fully differential CMOS class AB transmitter for 10 Gb/s serial links. The transmitter consists
of a fully differential multiplexer, a rail-to-rail configured pre-amplification stage, and a push-pull output stage. The
multiplexer achieves a high multiplexing speed by using modified pseudo-NMOS logic where pull-up networks are replaced with
self-biased active inductors. The rail-to-rail configured pre-amplification stage with active inductors amplifies the signals
from the multiplexer. The fully differential output current is generated by a class AB output stage operated in a push-pull
mode. High data rates of the transmitter are obtained by ensuring that the transistors in both the pre-amplification and output
stages are always in saturation and the voltage swing of all critical nodes is small. The fully differential configuration
of the transmitter effectively suppresses common-mode disturbances, particularly those coupled from the power and ground rails,
the electro-magnetic interference exerted from channels to neighboring devices is also minimized. The transmitter minimizes
switching noise by drawing a constant current from the supply voltage.
The transmitter has been implemented in TSMC 0.18 μm 1.8 V 6-metal CMOS technology and analyzed using Spectre from Cadence
Design Systems with BSIM3.3 device models. Simulation results demonstrate that the transmitter provides a 5 mA peak-to-peak
differential output current with 100 ps eye-width and >5 mA eye-height at 10 Gb/s. The transmitter consumes 18 mW with a total
transistor area of 100 μm2 approximately.
Jean Jiang received the B.Eng. degree in Electrical Engineering from Wuhan University of Technology, Wuhan, China in 1995, and the M.A.Sc.
degree in Electrical and Computer Engineering from Ryerson University, Toronto, Ontario, Canada in 2004. From 1999 to 2001,
she worked for Ericsson Global IT Services where she was a technical staff to maintain computer networks. From 2002 to 2004,
she was a research assistant and a M.A.Sc. student with the Microsystem Research Laboratory in the Department of Electrical
and Computer Engineering at Ryerson University. She is now with Intel Corp., CA. as an IC design engineer. Her research interests
are in analog CMOS circuit design for high-speed data communications. Jean Jiang was awarded the Ontario Graduate Scholarship
in 2003–2005 for academic excellence.
Fei Yuan received the B.Eng. degree in electrical engineering from Shandong University, Jinan, China in 1985, the M.A.Sc. degree in
chemical engineering and Ph.D. degree in electrical engineering from University of Waterloo, Waterloo, Ontario, Canada in
1995 and 1999, respectively. During 1985–1989, he was a Lecturer in the Department of Electrical Engineering, Changzhou Institute
of Technology, Jiangsu, China. In 1989 he was a Visiting Professor at Humber College of Applied Arts and Technology, Toronto,
Ontario, Canada, and Lambton College of Applied Arts and Technology, Sarnia, Ontario, Canada. He was with Paton Controls Limited,
Sarnia, Ontario, Canada as a Controls Engineer during 1989–1994. Since 1999 he has been with the Department of Electrical
and Computer Engineering, Ryerson University, Toronto, Ontario, Canada, where he is currently an Associate Professor and the
Associate Chair for Undergraduate Studies and Faculty Affairs. He is the co-author of the book Computer Methods for Analysis of Mixed-Mode Switching Circuits (Springer-Verlag, 2004, with Ajoy Opal).
Dr. Yuan received the Ryerson Research Chair award from Ryerson University in Jan. 2005, the Research Excellence Award from
the Faculty of Engineering and Applied Science of Ryerson University in 2004, the post-graduate scholarship from Natural Science
and Engineering Research Council of Canada during 1997–1998, and the Teaching Excellence Award from Changzhou Institute of
Technology in 1988. Dr. Yuan is a senior member of IEEE and a registered professional engineer in the province of Ontario,
Canada. 相似文献
3.
This paper presents a new class AB transmitter with a low supply voltage/ground bouncing sensitivity for 10 Gb/s serial links.
The low sensitivity of the output current to supply voltage fluctuation and ground bouncing is achieved by operating the system
in a rail-to-rail swing mode. High data rates are obtained by multiplexing at low-impedance nodes and inductive shunt peaking
with active inductors. The fully differential configuration and bipolar signaling of the transmitter minimize the effect of
both common-mode disturbances and electro-magnetic interferences exerted from channels to neighboring devices. The class AB
operation of the transmitter minimizes its static power consumption. The proposed transmitter is implemented in a 1.2 V 0.13μm CMOS technology and analyzed using Spectre from Cadence Design Systems with BSIM3v3 device models. Both pre and post-layout
simulation results demonstrate that the transmitter conveys a sufficiently large differential output current that is insensitive
to supply voltage fluctuation and ground bouncing at 10 Gb/s.
Fei Yuan received the B.Eng. degree in electrical engineering from Shandong University, Jinan, China in 1985, the M.A.Sc. degree in
chemical engineering, and Ph.D. degree in electrical engineering from University of Waterloo, Waterloo, Ontario, Canada in
1995 and 1999, respectively. During 1985–1989, he was a Lecturer in the Department of Electrical Engineering, Changzhou Institute
of Technology, Jiangsu, China. In 1989 he was a Visiting Professor at Humber College of Applied Arts and Technology, Toronto,
Ontario, Canada, and Lambton College of Applied Arts and Technology, Sarnia, Ontario, Canada. He was with Paton Controls Limited,
Sarnia, Ontario, Canada as a Controls Engineer during 1989–1994. Since 1999 he has been with the Department of Electrical
and Computer Engineering, Ryerson University, Toronto, Ontario, Canada, where he is currently an Associate Professor and the
Associate Chair for Undergraduate Studies and Faculty Affairs. He is the co-author of the book Computer Methods for Analysis of Mixed-Mode Switching Circuits (Springer-Verlag, 2004, with Ajoy Opal). Dr. Yuan received the Ryerson Research Chair award from Ryerson University in Jan.
2005, the Research Excellence Award from the Faculty of Engineering and Applied Science of Ryerson University in 2004, the
post-graduate scholarship from Natural Science and Engineering Research Council of Canada during 1997–1998, and the Teaching
Excellence Award from Changzhou Institute of Technology in 1988. Dr. Yuan is a senior member of IEEE and a registered professional
engineer in the province of Ontario, Canada.
Minghai Li received the B.Eng. (96) and M.A.Sc (06) degrees from North University of China and Ryerson University, Toronto, Ontario,
Canada, respectively, both in Electrical and Computer Engineering. During 1996–2001, he was with Motorola Semiconductor (China)
as a MCU product engineer. He was involved with MCU new product design, simulation, and test program development. He was a
research assistant and a M.A.Sc student with the Microsystems Research Laboratory in the Department of Electrical and Computer
Engineering at Ryerson University. He is now with Micron Technology Inc., Boise, Idaho, USA as a design engineer. His research
interest is in the design of CMOS mixed-signal circuits for high-speed data transmission, including multiplexer, driver, pre-emphasis,
and VCOs. 相似文献
4.
Ricardo A. Aroca C. Andre T. Salama 《Analog Integrated Circuits and Signal Processing》2006,48(3):167-174
This paper presents the design and implementation of a new wide dynamic range parallel feedback (PF) transimpedance amplifier
(TIA) for 10 Gb/s optical links. The wide dynamic range is attributed to the novel TIA architecture employing both shunt-shunt
and shunt-series feedback networks. The outstanding features of the TIA are wide dynamic range, high gain, low power consumption
and design simplicity. A prototype implemented in a 0.5 μm SiGe BiCMOS technology and operating at −3.3 V power supply features
an 18.4 dBm dynamic range with a BER less than 10−12, an optical sensitivity of −16 dBm, optical overload of +2.4 dBm, a bandwidth of 8.27 GHz, a gain of 950 Ω and a power consumption
of 189 mW. The new parallel feedback architecture offers improved overload and noise performance when compared to previously
reported, state of the art, single feedback TIA designs and meets all the 10 Gigabit Ethernet and short-reach OC-192 SONET
specifications.
Ricardo Andres Aroca received the B.S. (Hons) degree in electrical engineering from the University of Windsor, Canada, and the M.S. degree from
the University of Toronto, Canada, in 2001 and 2004, respectively. In 2000 he spent two 4 month internships with Nortel Networks
in the Microelectronics Department. Mr. Aroca received the Natural Sciences and Engineering Research Counsel of Canada (NSERC)
Postgraduate Scholarship award in 2002. He is currently working toward the Ph.D. degree at the University of Toronto where
his research interests lie in the area of high-frequency integrated circuits for wireless and wireline communication systems.
C. Andre T. Salama received the B.A.Sc. (Hons.) M.A.Sc. and Ph. D. degrees, all in Electrical Engineering, from the University of British Columbia
in 1961, 1962 and 1966 respectively. From 1962 to 1963 he served as a Research Assistant at the University of California,
Berkeley. From 1966 to 1967 he was employed at Bell Northern Research, Ottawa, as a Member of Scientific Staff working in
the area of integrated circuit design. Since 1967 he has been on the staff of the Department of Electrical and Computer Engineering,
University of Toronto where he held the J.M. Ham Chair in Microelectronics from 1987 to 1997. In 1992, he was appointed to
his present position of University Professor for scholarly achievements and preeminence in the field of microelectronics.
In 1989-90, he was awarded the ITAC/NSERC Research Fellowship in information technology. In 1994, he was awarded the Canada
Council I.W. Killam Memorial Prize in Engineering for outstanding career contributions to the field of microelectronics. In
2000, he received the IEEE Millenium Medal. In 2003, he received the Outstanding Lifetime Achievement Award from the Canadian
Semiconductor Technology Conference for seminal and outstanding contributions to semiconductor device research and promotion
of Canadian University research in microelectronics. In 2004, he received the NSERC Lifetime Achievement Award of Research
Excellence for outstanding and sustained contributions to the field of microelectronics and the Networks of Centres of Excellence
(NCE) Recognition Award for research excellence and outstanding leadership.He was associate editor of the IEEE Transactions
on Circuits and Systems in 1986–88 and a member of the International Electron Devices Meeting (IEDM) Technical Program Committeein
1980–82, 1987–89 and 1996–98. He was the chair of the Solid State Devices Subcommittee for IEDM in 1998 and was a member of
the editorial board of Solid State Electronics from 1984 to 2002. He is presently a member of the editorial board of the Analog
IC and Signal Processing Journal and the Technical Program Committee of the International Symposium on Power Semiconductor
Devices and ICs (ISPSD) and the Technical ProgramCommittee of the International Symposium on Low Power Electronics and Design
(ISLPED). He chaired the technical program committee of ISPSD in 1996 and was the general chair for the conference in 1999.Dr.
Salama is the Scientific Director of Micronet, a network of centres of excellence focussing on microelectronics research and
funded by the Canadian Government and Industry. He has published extensively in technical journals, is the holder of eleven
patents and has served as a consultant to the semiconductor industry in Canada and the U.S. His research interests include
the design and fabrication of semiconductor devices and integrated circuits with emphasis on deep submicron devices as well
as circuits and systems for high speed, low power signal processing applications. Dr. Salama is a Fellow of the Institute
of Electrical and Electronics Engineers, a Fellow of the Royal Society of Canada, a Fellow of the Canadian Academy of Engineering,
a member of the Association of Professional Engineers of Ontario, the Electrochemical Society and the Innovation Management
Association of Canada. 相似文献
5.
Yu Cheng Xinhua Ling Lin X. Cai Wei Song Weihua Zhuang Xuemin Shen Alberto Leon-Garcia 《Wireless Networks》2009,15(1):73-86
This paper presents an analytical model for evaluating the statistical multiplexing effect, admission region, and contention
window design in multiclass wireless local area networks (WLANs). We consider distributed medium access control (MAC) which
provisions service differentiation by assigning different contention windows to different classes. Mobile nodes belonging
to different classes may have heterogeneous traffic arrival processes with different quality of service (QoS) requirements.
With bursty input traffic, e.g. on/off sources, our analysis shows that the WLAN admission region under the QoS constraint
can be significantly improved, when the statistical multiplexing effect is taken into account. We also analyze the MAC resource
sharing between the short-range dependent (SRD) on/off sources and the long-range dependent (LRD) fractional Brownian motion
(FBM) traffic, where the impact of the Hurst parameter on the admission region is investigated. Moveover, we demonstrate that
the proper selection of contention windows plays an important role in improving the WLAN’s QoS capability, while the optimal
contention window for each class and the maximum admission region can be jointly solved in our analytical model. The analysis
accuracy and the resource utilization improvement from statistical multiplexing gain and contention window optimization are
demonstrated by extensive numerical results.
Yu Cheng received the B.E. and M.E. degrees in Electrical Engineering from Tsinghua University, Beijing, China, in 1995 and 1998,
respectively, and the Ph.D. degree in Electrical and Computer Engineering from the University of Waterloo, Waterloo, Ontario,
Canada, in 2003. From September 2004 to July 2006, he was a postdoctoral research fellow in the Department of Electrical and
Computer Engineering, University of Toronto, Ontario, Canada. Since August 2006, he has been with the Department of Electrical
and Computer Engineering, Illinois Institute of Technology, Chicago, Illinois, USA, as an Assistant Professor. His research
interests include service and application oriented networking, autonomic network management, Internet performance analysis,
resource allocation, wireless networks, and wireless/wireline interworking. He received a Postdoctoral Fellowship Award from
the Natural Sciences and Engineering Research Council of Canada (NSERC) in 2004.
Xinhua Ling received the B. Eng. degree in Radio Engineering from Southeast University, Nanjing, China in 1993 and the M. Eng. degree
in Electrical Engineering from the National University of Singapore, Singapore in 2001. He is currently pursuing the Ph.D.
degree in the Department of Electrical and Computer Engineering at the University of Waterloo, Ontario, Canada. From 1993
to 1998, he was an R&D Engineer in Beijing Institute of Radio Measurement, China. From February 2001 to September 2002, he
was with the Centre for Wireless Communications (currently Institute for Infocom Research), Singapore, as a Senior R&D Engineer,
developing the protocol stack for UE in the UMTS system. His general research interests are in the areas of cellular, WLAN,
WPAN, mesh and ad hoc networks and their internetworking, focusing on protocol design and performance analysis.
Lin X. Cai received the B.Sc. degree in computer science from Nanjing University of Science and Technology, Nanjing, China, in 1996
and the MASc. degree in electrical and computer engineering from the University of Waterloo, Waterloo, Canada, in 2005. She
is currently working toward the Ph.D. degree in the same field at the University of Waterloo. Her current research interests
include network performance analysis and protocol design for multimedia applications over wireless networks.
Wei Song received the B.S. degree in electrical engineering from Hebei University, China, in 1998 and the M.S. degree in computer
science from Beijing University of Posts and Telecommunications, China, in 2001. She is currently working toward the Ph.D.
degree at the Department of Electrical and Computer Engineering, University of Waterloo, Canada. Her current research interests
include resource allocation and quality-of-service (QoS) provisioning for the integrated cellular networks and wireless local
area networks (WLANs).
Weihua Zhuang received the Ph.D. degree in electrical engineering from the University of New Brunswick, Canada. Since October 1993, she
has been with the Department of Electrical and Computer Engineering, University of Waterloo, Canada, where she is a Professor.
Dr. Zhuang is a co-author of the textbook Wireless Communications and Networking (Prentice Hall, 2003). Her current research interests include multimedia wireless communications, wireless networks, and
radio positioning. She received the Outstanding Performance Award in 2005 and 2006 from the University of Waterloo and the
Premier’s Research Excellence Award in 2001 from the Ontario Government for demonstrated excellence of scientific and academic
contributions. She is the Editor-in-Chief of IEEE Transactions on Vehicular Technology and an Editor of IEEE Transactions on Wireless Communications.
Xuemin (Sherman) Shen received the B.Sc.(1982) degree from Dalian Maritime University (China) and the M.Sc. (1987) and Ph.D. degrees (1990) from
Rutgers University, New Jersey (USA), all in electrical engineering. He is a Professor and the Associate Chair for Graduate
Studies, Department of Electrical and Computer Engineering, University of Waterloo, Canada. His research focuses on mobility
and resource management in interconnected wireless/wired networks, UWB wireless communications systems, wireless security,
and ad hoc and sensor networks. He is a co-author of three books, and has published more than 300 papers and book chapters
in wireless communications and networks, control and filtering. Dr. Shen serves as the Technical Program Committee Chair for
IEEE Globecom’07, General Co-Chair for Chinacom’07 and QShine’06, the Founding Chair for IEEE Communications Society Technical
Committee on P2P Communications and Networking. He also serves as a Founding Area Editor for IEEE Transactions on Wireless Communications; Associate Editor for IEEE Transactions on Vehicular Technology; KICS/IEEE Journal of Communications and Networks; Computer Networks (Elsevier); ACM/Wireless Networks; and Wireless Communications and Mobile Computing (John Wiley), etc. He has also served as Guest Editor for IEEE JSAC, IEEE Wireless Communications, and IEEE Communications Magazine. Dr. Shen received the Excellent Graduate Supervision Award in 2006, and the Outstanding Performance Award in 2004 from the
University of Waterloo, the Premier’s Research Excellence Award in 2003 from the Province of Ontario, Canada, and the Distinguished
Performance Award in 2002 from the Faculty of Engineering, University of Waterloo. Dr. Shen is a registered Professional Engineer
of Ontario, Canada.
Alberto Leon-Garcia received the B.S., M.S., and Ph.D. degrees in electrical engineering from the University of Southern California, in 1973,
1974, and 1976 respectively. He is a Full Professor in the Department of Electrical and Computer Engineering, University of
Toronto, ON, Canada, and he currently holds the Nortel Institute Chair in Network Architecture and Services. In 1999 he became
an IEEE fellow for “For contributions to multiplexing and switching of integrated services traffic”.
Dr. Leon-Garcia was Editor for Voice/Data Networks for the
IEEE Transactions on Communications from 1983 to 1988 and Editor for the IEEE Information Theory Newsletter from 1982 to 1984. He was Guest Editor of the September 1986 Special Issue on Performance Evaluation of Communications Networks
of the IEEE Selected Areas on Communications. He is also author of the textbooks Probability and Random Processes for Electrical Engineering (Reading, MA: Addison-Wesley), and Communication Networks: Fundamental Concepts and Key Architectures (McGraw-Hill), co-authored with Dr. Indra Widjaja. 相似文献
6.
There is no theoretical time or frequency restrictions on capacity in DS-CDMA systems. In these systems, the signal to interference
ratio (SIR) has a major effect on capacity. Since an increase in the user SIR at the base station (BS) leads to higher capacity,
transmission power control is employed. The nonuniform distribution of users in the network causes different quality of service
(QOS) in distinct regions, therefore network resources may not be utilized properly. A dynamic distribution algorithm can
be employed to balance the QOS delivered in different regions of the network. In this paper, a novel dynamic distribution
algorithm is introduced. The proposed algorithm deactivates certain users when the network encounters an overload. By applying
this policy, the required SIR can be maintained for the remaining users.
F. Hendessi received a B.Sc. degree from Baluchestan University, Iran in 1986, and an M.Sc. degree from Isfahan University of Technology,
Iran in 1988, both in Electrical Engineering. In 1993 he received a Ph.D. in Electrical Engineering from Carleton University,
Ottawa, Ontario, Canada. He is currently an Assistant Professor in the Department of Electrical Engineering at Isfahan University
of Technology.
A. Ghayoori received B.Sc. and M.Sc. degrees in Electrical Engineering from Isfahan University of Technology, Isfahan, Iran, in 2001
and 2003, respectively. He is currently a Research Engineer with the ICT research center at IUT.
T. A. Gulliver received a Ph.D. degree in Electrical and Computer Engineering from the University of Victoria, Victoria, BC, Canada in 1989.
From 1989 to 1991 he was employed as a Defence Scientist at Defence Research Establishment Ottawa, Ottawa, ON, Canada. He
has held academic positions at Carleton University, Ottawa, and the University of Canterbury, Christchurch, New Zealand. He
joined the University of Victoria in 1999 and is a Professor in the Department of Electrical and Computer Engineering.
He is a Senior Member of the IEEE and a member of the Association of Professional Engineers of Ontario, Canada. In 2002, he
became a Fellow of the Engineering Institute of Canada. His research interests include information theory and communication
theory, algebraic coding theory, cryptography, construction of optimal codes, turbo codes, spread spectrum communications,
space-time coding and ultra wideband communications. 相似文献
7.
This paper presents an in-depth study of the pros and cons of voltage-mode multiplexers for Gbps serial links and exploits the advantages of multiplexing in current domain. In addition, it proposes a new fully differential CMOS current-mode multiplexer where a high multiplexing speed is achieved by multiplexing at a low-impedance node. Multiplexing speed is further improved by inductive shunt peaking with active inductors. The differential configuration of the multiplexer minimizes the effect of common-mode disturbances, particularly those coupled from the power and ground rails. The flow of the output currents in the opposite directions minimizes the effect of electro-magnetic interference from channels, making the multiplexer particularly attractive for high-speed data transmission over long interconnects and printed-circuit-board (PCB) traces. The proposed multiplexer draws a constant current from the supply voltage, thereby minimizing both switching noise and noise injected to the substrate. A fully differential CMOS current-mode 8-to-l multiplexer has been implemented in TSMC’s 1.8 V 0.18 μm CMOS technology and analyzed using Spectre from Cadence Design Systems with BSIM3.3v device models. Simulation results demonstrate that the multiplexer offers sufficiently large eye-opening when multiplexed at 10 Gbps.Jean Jiang received the B.Eng. degree in Electrical Engineering from Wuhan University of Technology, Wuhan, China in 1995. From 1999 to 2001, she worked for Ericsson Global IT Services where she was a technical staff to maintain computer networks. Since 2002, she has been a research assistant with the System-on-Chip research lab of Ryerson University. She is currently a M.A.Sc candidate under the supervision of Dr. Fei Yuan in the Department of Electrical and Computer Engineering, Ryerson University, Toronto, Canada. Her research interests are in analog CMOS circuit design for high-speed data communications. She was awarded the Ontario Graduate Scholarship (OGS) in 2003–2005 for academic excellence.Fei Yuan received the B.Eng. degree in electrical engineering from Shandong University, Jinan, China in 1985, the MASc. degree in chemical engineering and PhD. degree in electrical engineering from University of Waterloo, Waterloo, Ontario, Canada in 1995 and 1999, respectively.During 1985–1989, he was a Lecturer in the Department of Electrical Engineering, Changzhou Institute of Technology, Jiangsu, China. In 1989 he was a Visiting Professor at Humber College of Applied Arts and Technology, Toronto, Canada. During 1989–1994, he worked for Paton Controls Limited, Sarnia, Ontario, Canada as a Controls Engineer. Since July 1999 he has been with the Department of Electrical and Computer Engineering, Ryerson University, Toronto, Ontario, Canada, where he is currently an Associate Professor and the Associate Chair for Undergraduate Studies and Faculty Affairs. He is the co-author of the book “Computer Methods for Analysis of Mixed-Mode Switching Circuits” (Kluwer Academic Publishers, 2004, with Ajoy Opal). Dr. Yuan received an “Excellence of Teaching” award from Changzhou Institute of Technology in 1988, a post-graduate scholarship from Natural Science and Engineering Research Council (NSERC) of Canada during 1997–1998. He is a senior member of IEEE and a registered professional engineer in the province of Ontario, Canada. 相似文献
8.
This paper presents Quality of Service (QoS) based routing and priority class assignment algorithms. It introduces an end-to-end
delay margin balancing approach to routing, and uses it to formulate a nonlinear optimization problem. In a single-class network,
the formulation is shown to be convex; however in a multi-class priority network, it is only convex within specific regions,
and is infeasible otherwise. A centralized off-line computation technique is proposed to calculate both the route configuration
and end-to-end priority assignment. A gradient-based solution in the convex region and a heuristic to overcome the multi-class
discontinuity are derived. An approximation of the optimization problem is developed for on-line distributed processing is
then presented. Using the approximation, arriving traffic flows can use vector routing tables to search for routes. Compared
with minimum-hop, minimum-delay, and min-interference routing algorithms, the proposed approach enables the single-class network
to accommodate more users of different end-to-end delay requirements. In a multi-class priority network, results show that
using the objective function to combine route and priority class assignment further increases the supportable network traffic
volume.
Mohamed Ashour received his B.Sc. (1991) and M.Sc. (1997) in Electrical Engineering from Ain Shams University, Cairo, Egypt. He worked for
Hughes and General Dynamics as a Telecommunications Engineer. Currently, he is a Ph.D. Candidate in the Department of Electrical
and Computer Engineering of McGill University, Montreal, Quebec, Canada. His current area of research is focused on traffic
engineering, routing, and QoS provisioning in DiffServ and MPLS Networks. He is also interested in multi-class queuing analysis
of long-range traffic, and QoS provisioning in ad hoc networks and satellite communications.
Tho Le-Ngoc obtained his B. Eng. (with Distinction) in Electrical Engineering in 1976, his M.Eng. in Microprocessor Applications in 1978
from McGill University, Montreal, and his Ph.D. in Digital Communications 1983 from the University of Ottawa, Canada.
During 1977–1982, he was with Spar Aerospace Limited as a Design Engineer and then a Senior Design Engineer, involved in the
development and design of the microprocessor-based controller of Canadarm (of the Space Shuttle), and SCPC/FM, SCPC/PSK, TDMA
satellite communications systems.
During 1982–1985, he was an Engineering Manager of the Radio Group in the Department of Development Engineering of SRTelecom
Inc., developed the new point-to-multipoint DA-TDMA/TDM Subscriber Radio System SR500. He was the System Architect of this
first digital point-to-multipoint wireless TDMA system.
During 1985–2000, he was a Professor the Department of Electrical and Computer Engineering of Concordia University. Since
2000, he has been with the Department of Electrical and Computer Engineering of McGill University.
His research interest is in the area of broadband digital communications with a special emphasis on Modulation, Coding, and
Multiple-Access Techniques. He is a Senior Member of the Ordre des Ingénieur du Quebec, a Fellow of the Institute of Electrical
and Electronics Engineers (IEEE), a Fellow of the Engineering Institute of Canada (EIC), and a Fellow of the Canadian Academy
of Engineering (CAE). He is the recipient of the 2004 Canadian Award in Telecommunications Research, and recipient of the
IEEE Canada Fessenden Award 2005. 相似文献
9.
In this paper, we present modifications to the constant-gm bias circuit and Miller-lead compensation of operational amplifiers which eliminate or minimize some of their shortcomings. First, we demonstrate how parasitic pad capacitance can cause instability in the constant-gm bias circuit, and show that the transconductance is constant only for specific bias conditions. Next, we suggest a new circuit topology that requires 75% less compensation capacitance to achieve stability. We also discuss problems with Miller-lead compensation that arise from temperature, process, and load variations. Finally, we present a new biasing technique to correct these problems, and, through simulation, demonstrate a 40∘ improvement in phase margin over load current variations.Sean Nicolson received the B.A.Sc. degree in 2000 from Simon Fraser University, Vancouver, Canada, and the M.A.Sc. degree in 2003 from the University of Toronto, Toronto, Canada. In 2001, he was an design engineer for NeuroStream Technologies, Inc., where he developed implantable electronic systems.Currently, he is working on his PhD degree in the Edward S. Rogers Senior Department of Electrical and Computer Engineering, University of Toronto. His research interests include integrated circuits for biomedical applications, RF communication systems, and millimeter-wave circuits.Khoman Phang (M’00) received the B.A.Sc., M.A.Sc., and Ph.D. degrees in 1990, 1992, and 2001 respectively from the University of Toronto, On, Canada. In 1993, he was a visiting researcher at Sony headquarters in Tokyo, Japan. He joined the Microelectronics Division of IBM, Toronto, Canada in 1994, where he was involved in the development of infrared wireless networking products.In 2000, he joined the University of Toronto where he is currently an Assistant Professor in the Edward S. Rogers Senior Department of Electrical and Computer Engineering. His research interests include analog integrated circuits, optical communication systems, and integrated circuits for biomedical applications. 相似文献
10.
Farsheed Mahmoudi C. Andre T. Salama 《Analog Integrated Circuits and Signal Processing》2006,48(3):185-197
The design and implementation of an 8 GHz CMOS quadrature downconverter, achieving simultaneously low voltage supply operation
and good linearity is presented in this paper. This is achieved by relaxing the inherent tradeoff between power conversion
gain and linearity governing all active mixers and implementing a mixer using a new version of the bias-offset technique.
The quadrature generator uses active inductors embodied in the LO buffer, and provides easy tuning by relaxing the coupling
between amplitude and phase tuning of the outputs. It also provides reduced power consumption by eliminating the buffers located
between the quadrature generator and the mixers. A prototype implemented in a 0.18 μm CMOS technology occupies an area of
0.44 × 0.3 mm2, operates from a 1V power supply and features an IIP3 of +3.5 dBm, an IIP2 of better than +48 dBm, an input compression point
of −5.5 dBm, a power conversion gain of +6.5 dB for the mixers and a quadrature phase and amplitude matching of better than
1.5° and 1 dB respectively over a bandwidth of 100 MHz after tuning. The overall power consumption of the quadrature downconverter
is 25.8 mW.
Farsheed Mahmoudi was born in Tehran, Iran. He received his B.Sc. and M.Sc. degrees in Electronics from the University of Tehran, Tehran, Iran
in 1997 and 2000 respectively. He is currently working toward the Ph.D. degree at the University of Toronto, Toronto, Canada.
His research interests include the design and analysis of RF circuits and systems for wireless applications.
C. Andre T. Salama received the B.A.Sc. (Hons.) M.A.Sc. and Ph. D. degrees, all in Electrical Engineering, from the University of British Columbia
in 1961, 1962 and 1966 respectively.
From 1962 to 1963 he served as a Research Assistant at the University of California, Berkeley. From 1966 to 1967 he was employed
at Bell Northern Research, Ottawa, as a Member of Scientific Staff working in the area of integrated circuit design. Since
1967 he has been on the staff of the Department of Electrical and Computer Engineering, University of Toronto where he held
the J.M. Ham Chair in Microelectronics from 1987 to 1997. In 1992, he was appointed to his present position of University
Professor for scholarly achievements and preeminence in the field of microelectronics. In 1989–90, he was awarded the ITAC/NSERC
Research Fellowship in information technology. In 1994, he was awarded the Canada Council I.W. Killam Memorial Prize in Engineering
for outstanding career contributions to the field of microelectronics. In 2000, he received the IEEE Millenium Medal. In 2003,
he received the Outstanding Lifetime Achievement Award from the Canadian Semiconductor Technology Conference for seminal and
outstanding contributions to semiconductor device research and promotion of Canadian University research in microelectronics.
In 2004, he received the NSERC Lifetime Achievement Award of Research Excellence for outstanding and sustained contributions
to the field of microelectronics and the Networks of Centres of Excellence (NCE) Recognition Award for research excellence
and outstanding leadership.
He was associate editor of the IEEE Transactions on Circuits and Systems in 1986–88 and a member of the International Electron
Devices Meeting (IEDM) Technical Program Committee in 1980–82, 1987–89 and 1996–98. He was the chair of the Solid State Devices
Subcommittee for IEDM in 1998 and was a member of the editorial board of Solid State Electronics from 1984 to 2002. He is
presently a member of the editorial board of the Analog IC and Signal Processing Journal and the Technical Program Committee
of the International Symposium on Power Semiconductor Devices and ICs (ISPSD) and the Technical Program Committee of the International
Symposium on Low Power Electronics and Design (ISLPED). He chaired the technical program committee of ISPSD in 1996 and was
the general chair for the conference in 1999.
Dr. Salama is the Scientific Director of Micronet, a network of centres of excellence focussing on microelectronics research
and funded by the Canadian Government and Industry.
He has published extensively in technical journals, is the holder of eleven patents and has served as a consultant to the
semiconductor industry in Canada and the U.S. His research interests include the design and fabrication of semiconductor devices
and integrated circuits with emphasis on deep submicron devices as well as circuits and systems for high speed, low power
signal processing applications.
Dr. Salama is a Fellow of the Institute of Electrical and Electronics Engineers, a Fellow of the Royal Society of Canada,
a Fellow of the Canadian Academy of Engineering, a member of the Association of Professional Engineers of Ontario, the Electrochemical
Society and the Innovation Management Association of Canada. 相似文献
11.
In this paper, we develop an analytical model to evaluate the delay performance of the burst-frame-based CSMA/CA protocol
under unsaturated conditions, which has not been fully addressed in the literature. Our delay analysis is unique in that we
consider the end-to-end packet delay, which is the duration from the epoch that a packet enters the queue at the MAC layer
of the transmitter side to the epoch that the packet is successfully received at the receiver side. The analytical results
give excellent agreement with the simulation results, which represents the accuracy of our analytical model. The results also
provide important guideline on how to set the parameters of the burst assembly policy. Based on these results, we further
develop an efficient adaptive burst assembly policy so as to optimize the throughput and delay performance of the burst-frame-based
CSMA/CA protocol.
Kejie Lu received the B.E. and M.E. degrees in Telecommunications Engineering from Beijing University of Posts and Telecommunications,
Beijing, China, in 1994 and 1997, respectively. He received the Ph.D. degree in Electrical Engineering from the University
of Texas at Dallas in 2003. In 2004 and 2005, he was a postdoctoral research associate in the Department of Electrical and
Computer Engineering, University of Florida. Currently, he is an assistant professor in the Department of Electrical and Computer
Engineering, University of Puerto Rico at Mayagüez. His research interests include architecture and protocols design for computer
and communication networks, performance analysis, network security, and wireless communications.
Jianfeng Wang received the B.E. and M.E. degrees in electrical engineering from Huazhong University of Science and Technology, China, in
1999 and 2002, respectively, and the Ph.D. degree in electrical engineering from University of Florida in 2006. From January
2006 to July 2006, he was a research intern in wireless standards and technology group, Intel Corporation. In October 2006,
he joined Philips Research North America as a senior member research staff in wireless communications and networking department.
He is engaged in research and standardization on wireless networks with emphasis on medium access control (MAC).
Dapeng Wu received B.E. in Electrical Engineering from Huazhong University of Science and Technology, Wuhan, China, in 1990, M.E. in
Electrical Engineering from Beijing University of Posts and Telecommunications, Beijing, China, in 1997, and Ph.D. in Electrical
and Computer Engineering from Carnegie Mellon University, Pittsburgh, PA, in 2003.
Since August 2003, he has been with Electrical and Computer Engineering Department at University of Florida, Gainesville,
FL, as an Assistant Professor. His research interests are in the areas of networking, communications, multimedia, signal processing,
and information and network security. He received the IEEE Circuits and Systems for Video Technology (CSVT) Transactions Best
Paper Award for Year 2001, and the Best Paper Award in International Conference on Quality of Service in Heterogeneous Wired/Wireless
Networks (QShine) 2006.
Currently, he serves as the Editor-in-Chief of Journal of Advances in Multimedia, and an Associate Editor for IEEE Transactions
on Wireless Communications, IEEE Transactions on Circuits and Systems for Video Technology, IEEE Transactions on Vehicular
Technology, and International Journal of Ad Hoc and Ubiquitous Computing. He is also a guest-editor for IEEE Journal on Selected
Areas in Communications (JSAC), Special Issue on Cross-layer Optimized Wireless Multimedia Communications. He served as Program
Chair for IEEE/ACM First International Workshop on Broadband Wireless Services and Applications (BroadWISE 2004); and as a
technical program committee member of over 30 conferences. He is Vice Chair of Mobile and wireless multimedia Interest Group
(MobIG), Technical Committee on Multimedia Communications, IEEE Communications Society. He is a member of the Best Paper Award
Committee, Technical Committee on Multimedia Communications, IEEE Communications Society.
Yuguang Fang received a Ph.D. degree in Systems Engineering from Case Western Reserve University in January 1994 and a Ph.D. degree in
Electrical Engineering from Boston University in May 1997. He was an assistant professor in the Department of Electrical and
Computer Engineering at New Jersey Institute of Technology from July 1998 to May 2000. He then joined the Department of Electrical
and Computer Engineering at University of Florida in May 2000 as an assistant professor and got an early promotion to an associate
professor with tenure in August 2003 and to a full professor in August 2005. He has published over 200 papers in refereed
professional journals and conferences. He received the National Science Foundation Faculty Early Career Award in 2001 and
the Office of Naval Research Young Investigator Award in 2002. He has served on several editorial boards of technical journals
including IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEE Transactions on Mobile Computing
and ACM Wireless Networks. He have also been actively participating in professional conference organizations such as serving
as The Steering Committee Co-Chair for QShine, the Technical Program Vice-Chair for IEEE INFOCOM’2005, Technical Program Symposium
Co-Chair for IEEE Globecom’2004, and a member of Technical Program Committee for IEEE INFOCOM (1998, 2000, 2003–2007). He
is a senior member of the IEEE. 相似文献
12.
Mohammed Smadi Terence D. Todd Vytas Kezys Vahid Azhari Dongmei Zhao 《Wireless Networks》2008,14(6):815-829
In this paper we consider vertical handoff for enterprise-based dual-mode (DM) cellular/WLAN handsets. When the handset roams
out of WLAN coverage, the DM's cellular interface is used to maintain the call by anchoring it through an enterprise PSTN
gateway/PBX. Soft handoff can be achieved in this case if the gateway supports basic conference bridging, since a new leg
of the call can be established to the conference bridge while the existing media stream path is active. Unfortunately this
requires that all intra-enterprise calls be routed through the gateway when the call is established. In this paper we consider
a SIP based architecture to perform conferenced dual-mode handoff and propose a much more scalable mechanism for short-delay
environments, whereby active calls are handed off into the conference bridge prior to the initiation of the vertical handoff.
Results are presented which are taken from a dual-mode handset testbed, from analytic models, and from simulations which characterize
the scalability of the proposed mechanism.
Mohammed Smadi received the B.Eng and Mgmt and M.A.Sc degrees in Computer Engineering from McMaster University in Hamilton, Ontario, Canada.
Mohammed received an NSERC doctoral award in 2005 and is currently a Ph.D. student at the Wireless Networking Group at McMaster
University.
Terence D. Todd received the B.A.Sc, M.A.Sc and Ph.D. degrees in Electrical Engineering from the University of Waterloo, Waterloo, Ontario,
Canada. While at Waterloo he spent 3 years as a Research Associate with the Computer Communications Networks Group (CCNG).
He is currently a Professor of Electrical and Computer Engineering at McMaster University in Hamilton, Ontario, Canada.
Professor Todd spent 1991 on research leave in the Distributed Systems Research Department at AT&T Bell Laboratories in Murray
Hill, NJ. He also spent 1998 on research leave at The Olivetti and Oracle Research Laboratory in Cambridge, England. While
at ORL he worked on the piconet project which was an early embedded wireless network testbed.
Dr. Todd’s research interests include metropolitan/local area networks, wireless communications and the performance analysis
of computer communication networks and systems. He is a past Editor of the IEEE/ACM Transactions on Networking and currently
holds the NSERC/RIM/CITO Chair on Pico-Cellular Wireless Internet Access Networks.
Dr. Todd is a Professional Engineer in the province of Ontario and a member of the IEEE.
Vytas Kezys was born in Hamilton, Canada in 1957. He received the B.Eng. degree in Electrical Engineering from McMaster University, Canada,
in 1979.
From 1979 to 1998, Mr. Kezys was involved in radar and communications research as Principal Research Engineer at the Communications
Research Laboratory, McMaster University. While at McMaster, his research activities included array signal processing for
low-angle tracking radar, radar signal processing, and smart antennas for wireless communications. Mr. Kezys was founder and
President of TalariCom Inc., a start-up company that developed cost effective smart antenna technologies for broadband wireless
access applications.
Currently, Mr. Kezys is Director of Advanced Products at Research in Motion in Waterloo, Canada.
Vahid S. Azhari received his B.S. and M.S. from the Department of Electrical and Computer Engineering, IUST and University of Tehran, Iran,
in 2000 and 2003 respectively. His M.S. research focused on designing scheduling algorithms for switch fabrics. He also worked
for two years for the Iranian Telecommunication Research Centre on developing software for SDH switches. He is currently pursuing
his Ph.D. degree at the Wireless Networking Laboratory, McMaster University, Canada. His main area of research includes handoff
management in integrated wireless networks, WLAN deployment techniques, and wireless mesh networks.
Dongmei Zhao received the Ph.D. degree in Electrical and Computer Engineering from the University of Waterloo, Waterloo, Ontario, Canada
in June 2002. Since July 2002 she has been with the Department of Electrical and Computer Engineering, McMaster University,
Hamilton, Ontario, Canada where she is an assistant professor. Dr. Zhao’s research interests include modeling and performance
analysis, quality-of-service provisioning, access control and admission control in wireless cellular networks and integrated
cellular and ad hoc networks. Dr. Zhao is a member of the IEEE. 相似文献
13.
Todays digital signal processing (DSP) applications use computationally complex and/or adaptive algorithms and have stringent requirements in terms of speed, size, cost, power consumption, and throughput. Efficient hardware implementation techniques should be employed to meet the requirements of these applications. Run-Time Reconfiguration (RTR) is a promising technique for reducing the hardware required for implementing DSP systems as well as improving the performance, speed and power consumption of these systems. In this survey, we explain different issues in run-time reconfigurable systems and list the implemented systems which support run-time reconfiguration. We also describe different applications of run-time reconfiguration and discuss the improvements achieved by applying run-time reconfiguration.Alireza Shoa received his B.Sc degree in Electrical Engineering from Sharif University of Technology, Tehran, Iran in 2001 and M.A.Sc degree in Electrical Engineering from McMaster University, Hamilton, Canada in 2003. Currently, he is a PhD candidate in Electrical Engineering at McMaster University. His research interests include VLSI circuits for signal processing and communication applications and image and video processing.Shahram Shirani received his B.S. in Electrical Engineering from Isfahan University of Technology, Isfahan, Iran, and M.Sc. in Biomedical Engineering from Amirkabir University of Technology, Tehran, Iran, and Ph.D. in Electrical Engineering from University of British Columbia, Vancouver, Canada, in 1989, 1994 and 2000 respectively. Since 2000 he has been with the department of Electrical and Computer Engineering, McMaster University, where he is an assistant professor. His research interests include image and video compression, multimedia communications, and ultrasonic imaging. He is a member of technical committee of IEEE International Conference on Image Processing (ICIP). He is a licensed professional engineer and a member of Institute of Electrical and Electronics Engineers (IEEE). 相似文献
14.
Energy use is a crucial design concern in wireless ad hoc networks since wireless terminals are typically battery-operated.
The design objectives of energy-aware routing are two folds: Selecting energy-efficient paths and minimizing the protocol
overhead incurred for acquiring such paths. To achieve these goals simultaneously, we present the design of several on-demand
energy-aware routing protocols. The key idea behind our design is to adaptively select the subset of nodes that are required
to involve in a route-searching process in order to acquire a high residual-energy path and/or the degree to which nodes are
required to participate in the process of searching for a low-power path in networks wherein nodes have transmission power
adjusting capability. Analytical and simulation results are given to demonstrate the high performance of the designed protocols
in energy-efficient utilization as well as in reducing the protocol overhead incurred in acquiring energy-efficient routes.
Baoxian Zhang received his B.S., M.S., and Ph.D. degrees in Electrical Engineering from Northern Jiaotong University, Beijing, China in
1994, 1997, and 2000, respectively. From January 2001 to August 2002, he was working with Department of Electrical and Computer
Engineering at Queen’s University in Kingston as a postdoctoral fellow. He is currently a research scientist with the School
of Information Technology and Engineering (SITE) of University of Ottawa in Ottawa, Ontario, Canada. He has published over
40 refereed technical papers in international journals and conference proceedings. His research interests include routing
algorithm and protocol design, QoS management, wireless ad hoc and sensor networks, survivable optical networks, multicast
communications, and performance evaluation. He is a member of the IEEE.
Hussein Mouftah joined the School of Information Technology and Engineering (SITE) of the University of Ottawa in September 2002 as a Canada
Research Chair (Tier 1) Professor in Optical Networks. He has been with the Department of Electrical and Computer Engineering
at Queen’s University (1979-2002), where he was prior to his departure a Full Professor and the Department Associate Head.
He has three years of industrial experience mainly at Bell Northern Research of Ottawa, now Nortel Networks (1977-79). He
has spent three sabbatical years also at Nortel Networks (1986-87, 1993-94, and 2000-01), always conducting research in the
area of broadband packet switching networks, mobile wireless networks and quality of service over the optical Internet. He
served as Editor-in-Chief of the IEEE Communications Magazine (1995-97) and IEEE Communications Society Director of Magazines
(1998-99) and Chair of the Awards Committee (2002-2003). He is a Distinguished Speaker of the IEEE Communications Society
since 2000.
Dr. Mouftah is the author or coauthor of five books, 22 book chapters and more than 700 technical papers and 8 patents in
this area. He is the recipient of the 1989 Engineering Medal for Research and Development of the Association of Professional
Engineers of Ontario (PEO), and the Ontario Distinguished Researcher Award of the Ontario Innovation Trust. He is the joint
holder of the Best Paper Award for a paper presented at SPECTS’2002, and the Outstanding Paper Award for papers presented
at the IEEE HPSR’2002 and the IEEE ISMVL’1985. Also he is the joint holder of a Honorable Mention for the Frederick W. Ellersick
Price Paper Award for Best Paper in the IEEE Communications Magazine in 1993. He is the recipient of the IEEE Canada (Region
7) Outstanding Service Award (1995). Also he is the recipient of the 2004 IEEE Communications Society Edwin Howard Armstrong
Achievement Award, and the 2004 George S. Glinski Award for Excellence in Research of the Faculty of Engineering, University
of Ottawa. Dr. Mouftah is a Fellow of the IEEE (1990) and Fellow of the Canadian Academy of Engineering (2003). 相似文献
15.
This paper presents a Computational Memory architecture for MPEG-4 applications with mobile devices. The proposed architecture
is used for real-time block-based motion estimation, which is the most computational intensive task in the video encoder.
It uses the exhaustive block-matching algorithm (EBMA) for motion estimation. The proposed architecture consists of embedded
SRAMs and a number of block-matching units working in parallel to process video data while stored in the memory. The block-matching
units access the embedded SRAMs simultaneously, which increases the speed of the architecture.
The architecture processes CIF format video sequences (i.e., the frame size is 352 × 288 pixels) with block size of 16 × 16
pixels and ±15 pixels search range. The proposed architecture has been designed, prototyped, and simulated for 0.18 μm TSMC
CMOS technology. The simulation shows that the proposed architectures processes up to 126 CIF frames per second with clock
frequency 100 MHz. The synthesized prototype of the proposed architecture includes 200 KB memory and it has an area of 33.75
mm2 and consumes 986.96 mW @100 MHz.
Mohammed Sayed received his B.Sc. degree from Zagazig University, Zagazig, Egypt, in 1997 and a postgraduate diploma in VLSI design from
the Information Technology Institute (ITI), Cairo, Egypt, in 1998. In 2003 he received his M.Sc. degree from University of
Calgary, Calgary, Canada. From 1998 to 2001 he was a research and teaching assistant at the Electronics & Communications Engineering
Department, Zagazig University, Egypt. In 2001 he became a research assistant at the Department of Electrical and Computer
Engineering, University of Calgary, Canada. His current research interests are System-on-Chip, Embedded Memories, and Digital
Video Processing.
Mr. Sayed received a number of scholarships and awards such as iCORE Scholarship from 2003 to 2005, SMC Industrial Collaboration
Award in June 2003, and the Micronet Annual Workshop Best Paper Award in April 2002. He has a number of journal and conference
publications and a number of contributions to the MPEG-4 standard (ISO/IEC JTC1/SC29/WG11 MPEG2002/ M8562 and M8563).
Wael Badawy is an associate professor in the Department of Electrical and Computer Engineering. He holds an adjunct professor in the
Department of Mechanical Engineering, University of Alberta.
Dr. Badawy's research interests are in the areas of: Microelectronics, VLSI architectures for video applications with low-bit
rate applications, digital video processing, low power design methodologies, and VLSI prototyping. His research involves designing
new models, techniques, algorithms, architectures and low power prototype for novel system and consumer products. Dr. Badawy
authored and co-authored more than 100 peer reviewed Journal and Conference papers and about 30 technical reports. He is the
Guest Editor for the special issue on System on Chip for Real-Time Applications in the Canadian Journal on Electrical and
Computer Engineering, the Technical Chair for the 2002 International Workshop on SoC for real-time applications, and a technical
reviewer in several IEEE journals and conferences. He is currently a member of the IEEE-CAS Technical Committee on Communication.
Dr. Badawy was honored with the “2002 Petro Canada Young Innovator Award”, “2001 Micralyne Microsystems Design Award” and
the 1998 Upsilon Pi Epsilon Honor Society and IEEE Computer Society Award for Academic Excellence in Computer Disciplines.
He is currently the Chairman of the Canadian Advisor Committee (CAC) and Head of the Canadian Delegation on ISO/IEC/JTC1/SC6
“Telecommunications and Information Exchange Between Systems”. Member, The Canadian Advisory Committee for the Standards Council
of Canada—Subcommittee 29: Coding of Audio, Picture Multimedia and Hypermedia Information, and Canadian Delegate, The ISO/IEC
MPEG standard committee. He is a voting Member on the VSI Alliance. He is also the Chair of the IEEE-Southern Alberta Society-Computer
Chapter. 相似文献
16.
In this paper we study connection admission control (CAC) in IEEE 802.11-based ESS mesh networks. An analytical model is developed
for studying the effects of CAC on mesh network capacity. A distributed CAC scheme is proposed, which incorporates load balancing
when selecting a mesh path for new connections. Our results show that connection level performance, including both average
number of connections and connection blocking probability, can be greatly improved using the proposed mechanism compared to
other admission control schemes.
Dongmei Zhao received the Ph.D. degree in Electrical and Computer Engineering from the University of Waterloo, Waterloo, Ontario, Canada
in June 2002. Since July 2002 she has been with the Department of Electrical and Computer Engineering, McMaster University,
Hamilton, Ontario, Canada where she is an assistant professor. Dr. Zhao’s research interests include modeling and performance
analysis, quality-of-service provisioning, access control and admission control in wireless networks. Dr. Zhao is a member
of the IEEE.
Jun Zou received his B. Eng. and M. Eng. Degrees from Tianjin University, China in 1999 and 2002, respectively. He worked at Siemens
Communication Networks Ltd., Beijing from 2002 to 2004. Currently, he is a PhD. student at McMaster University, Canada. His
research interests include wireless networking, routing protocols, architecture of next generation networks and network security.
Terence D. Todd received the B.A.Sc., M.A.Sc. and Ph.D. degrees in Electrical Engineering from the University of Waterloo, Waterloo, Ontario,
Canada. While at Waterloo Dr. Todd spent 3 years as a Research Associate with the Computer Communications Networks Group (CCNG).
He is currently a Professor of Electrical and Computer Engineering at McMaster University in Hamilton, Ontario, Canada. At
McMaster he has been the Principal Investigator on a number of projects in the optical networks and wireless networking areas.
Professor Todd spent 1991 on research leave in the Distributed Systems Research Department at AT&T Bell Laboratories in Murray
Hill, NJ. He also spent January-December 1998 on research leave at The Olivetti and Oracle Research Laboratory in Cambridge,
England. While at ORL he worked on the piconet project which was an early embedded wireless network testbed. Dr. Todd’s research
interests include metropolitan/local area networks, wireless communications and the performance analysis of computer communication
networks and systems. Dr. Todd is a past Editor of the IEEE/ACM Transactions on Networking and currently holds the NSERC/RIM/CITO
Chair on Pico-Cellular Wireless Internet Access Networks
Dr. Todd is a Professional Engineer in the province of Ontario and a member of the IEEE. 相似文献
17.
A fast converging adaptive minimum-mean-squared-error (MMSE) multiuser detector is proposed for direct-sequence code-division multiple-access (DS-CDMA) systems with severe near-far problem where the convergence rate of adaptive MMSE detectors for distinct users can be very different. It is shown that by successively cancelling the interference signals of strong power users, the convergence rate of the proposed detectors for weak power users can be significantly increased, which helps to reduce the length of training sequence for tracking. It is also shown that the order of cancellation and several important parameters required for interference cancellation can be determined from the convergence behavior of the proposed detector. Numerical results are presented to show that the proposed detector offers improved performance in various DS-CDMA environments.Zhiwei Mao received the B.Sc. degrees from Beijing University of Posts and Telecommunications (BUPT), Beijing, China in 1996 and 1999, respectively. Since 2000, she had been a Research Assistant and graduate student in the Department of Electrical and Coumputer Engineering, University of Victoria, Victoria, BC, Canada. She received the Ph.D. degree in electrical engineering in 2003. Currently, she is an Assistant Professor at Lakehead University, Thunder Bay, Ontario, Canada.Her research interests include wireless communications, multiuser detection, digital communications and digital singal processing.Vijay K. Bhargava received the B.Sc., M.Sc., and Ph.D. degree from Queens University, Kingston, ON, Canada in 1970, 1972 and 1974 respectively.Currently, he is a Professor and Head of the Department of Electrical and Computer Engineering at the University of British Columbia, Vancouver, Canada. Previously he was with the Univeristy of Victoria (1984–2003) and with Concordia University in Montréal (1976–1984). He is a co-author of the book Digital Communications by Satellite (New York: Wiley, 1981), co-editor of Reed-Solomon Codes and Their Applications (New York: IEEE, 1994) and co-editor of Communications, Information and Network Security (Boston: Kluwer, 2002). His research interest are in wireless communications.Dr. Bhargava is a Fellow of the B.C. Advanced Systems Institute, Engineering Institute of Canada (EIC), the IEEE, the Canadian Academy of Engineering and the Royal Society of Canada. He is a recipient of the IEEE Centennial Medal (1984), IEEE Canadas McNaughton Gold Medal (1995), the IEEE Haraden Pratt Award (1999), the IEEE Third Millennium Medal (2000), IEEE Graduate Teaching Award (2002), and the Eadie Medal of the Royal Society of Canada (2004).Dr. Bhargava is very active in the IEEE and was nominated by the IEEE Board of Director for the Office of IEEE President-Elect. Currently he serves on the Board of Communications Society. He is an Editor for the IEEE Transactions on Wireless Communications. He is a Past President of the IEEE Information Theory Society. 相似文献
18.
Erkan Yuce Oguzhan Cicekoglu Shahram Minaei 《Analog Integrated Circuits and Signal Processing》2006,46(3):287-291
A new circuit employing second-generation current conveyors (CCIIs), and unmatched resistors for converting a grounded immittance
to the corresponding floating immittance with either positive or negative adjustable multiplier, is presented. Moreover, the
proposed circuit can also realize a synthetic floating inductance employing a grounded capacitor depending on the passive
element selection. Simulation results using 0.35 μ m TSMC CMOS technology parameters are given.
Erkan Yuce was born in 1969 in Nigde, Turkey. He received the B.Sc. from Middle East Technical University and M.Sc. degrees from Pamukkale
University in 1994 and 1998 respectively. He is a Ph.D. student at Bogazici University all in Electrical and Electronics Engineering.
He is currently Research Assistant at the Electrical and Electronics Engineering Department of Bogazici University. His current
research interests include analog circuits, active filters, synthetic inductors, and current-mode circuits. He is the author
or co-author of about 10 papers published in scientific journals or conference proceedings.
Oguzhan Cicekoglu was born in 1963 in Istanbul, Turkey. He received the B.Sc. and M.Sc. degrees from Bogazici University and the Ph.D. degree
from Istanbul Technical University all in Electrical and Electronics Engineering in 1985, 1988 and 1996 respectively. He served
as lecturer at the School of Advanced Vocational Studies Electronics Prog. of Bogazici University where he held various administrative
positions between 1993 and 1999, and as part time lecturer at various institutions. He was with Biomedical Engineering Institute
between 1999 and 2001. He is currently Associate Professor at the Electrical and Electronics Engineering Department of Bogazici
University. His current research interests include analog circuits, active filters, analog signal processing applications
and current-mode circuits. He is the author or co-author of about 150 papers published in scientific journals or conference
proceedings. Oguzhan Cicekoglu is a member of the IEEE.
Shahram Minaei received his B.Sc. degree in Electrical and Electronics Engineering from Iran University of Science and Technology in 1993.
He received his M.Sc. and Ph.D. degrees in Electronics and Communication Engineering from Istanbul Technical University in
1997 and 2001, respectively. He is currently an Associate Professor at the Electronics and Communication Engineering Department
of Dogus University in Istanbul, Turkey. He has more than 50 journal or conference papers in scientific review. He served
as reviewer for a number of international journals and conferences. His current field of research concerns current-mode circuits
and analog signal processing. Shahram Minaei is a member of the IEEE. 相似文献
19.
We study the time synchronization problem for large-scale wireless sensor networks in the high-density regime. Our interest in this problem arises from a sensor networking application, where a large number of power-constrained radio transmitters coordinate their access to a Gaussian multiple access channel to cooperate in generating a waveform stronger than any individual node would be able to generate. In a companion paper to this one, we study theoretical aspects of a time synchronization mechanism that is optimal in the limit of asymptotically high network densities. In this work we summarize those results, and explore practical implementation issues of that mechanism in the context of networks with large, but finite, numbers of nodes. Through simulations, we find that the synchronization mechanism performs very well for finite (and relatively small) networks, maintaining tight clock synchronization indefinitely.Work supported by the National Science Foundation, under awards CCR- 0238271 (CAREER), CCR-0330059, and ANR-0325556.
An-swol Hu was born in Mt. Kisco, New York on February 24, 1980. He received his B.S. in Electrical Engineering from Stanford University in 2002. Currently he is a Ph.D. candidate in the School of Electrical and Computer Engineering at Cornell University. His research interests include information theory and statistical signal processing, with applications to sensor networks.
Sergio D. Servetto was born in Argentina, on January 18, 1968. He received a Licenciatura en Informática from Universidad Nacional de La Plata (UNLP, Argentina) in 1992, and the M.Sc. degree in Electrical Engineering and the Ph.D. degree in Computer Science from the University of Illinois at Urbana-Champaign (UIUC), in 1996 and 1999. From 1991 to 1994 he worked as a programmer for IBM Argentina. From 1994 to 1999 he was a Graduate Research Assistant at UIUC. From 1999 to 2001 he worked at the Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland. Since Fall 2001, he has been an Assistant Professor in the School of Electrical and Computer Engineering, Cornell University. He is also a member of the field of Applied Mathematics at Cornell. His research interests are centered around information theoretic aspects of networked systems, with a current emphasis on problems that arise in the context of large-scale sensor networks.Sergio was the recipient of the 1998 Ray Ozzie Fellowship, given to “outstanding graduate students in Computer Science”, and of the 1999 David J. Kuck Outstanding Thesis Award, for the best doctoral dissertation of the year, both from the Dept. of Computer Science at UIUC. He is also the recipient of a 2003 NSF CAREER Award. He has served on the technical program committee of various conferences (IEEE Infocom, Globecom, ICC, SECON; ACM MobiCom, MobiHoc, SenSys, WSNA). He will present a tutorial at ACM MobiHoc 2004, on the topic of “Efficient Architectures for Information Transport in Wireless Sensor Networks”. He is currently writing a book, tentatively entitled “Digital Communications over Packet-Switched Networks”, to be published by Kluwer.This revised version was published online in August 2005 with a corrected cover date. 相似文献
20.
Parvathinathan Venkitasubramaniam Srihari Adireddy Lang Tong 《The Journal of VLSI Signal Processing》2005,41(3):329-344
We consider a distributed medium access protocol, Opportunistic ALOHA, for reachback in sensor networks with mobile access
points (AP). We briefly discuss some properties of the protocol, like throughput and transmission control for an orthogonal
CDMA physical layer. We then consider the incorporation of necessary side information like location into the transmission
control and numerically demonstrate the loss in throughput in the absence of such information. Through simulations, we discuss
the robustness and sensitivity of the protocol under various modeling errors and propose strategies to allow for errors in
estimation of some parameters without reduction in the throughput. For networks, where the sensors are allowed to collaborate,
we consider three coding schemes for reliable transmission: spreading code independent, spreading code dependent transmission
and coding across sensors. These schemes are compared in terms of achievable rates and random coding error exponents. The
coding across sensors scheme has comparable achievable rates to the spreading code dependent scheme, but requires the additional
transmission of sensor ID. However, the scheme does not require the mobile AP to send data through the beacon unlike the other
two schemes. The use of these coding schemes to overcome sensitivity is demonstrated through simulations.
Parvathinathan Venkitasubramaniam was born in India in 1981. He received his B.Tech. degree from the department of Electrical Engineering, Indian Institute
of Technology, Madras in 2002. He joined the School of Electrical and Computer Engineering, Cornell University, Ithaca, NY,
in 2002 and he is working toward his Ph.D. degree. He is a recipient of the 2004 Leonard G. Abraham Award (with S. Adireddy
and L. Tong) from the IEEE Communications Society. His research interests include random-access protocols,sensor networks,
and information theory.
Srihari Adireddy was born in India in 1977. He received the B.Tech. degree from the Department of Electrical Engineering, Indian Institute
of Technology, Madras, and M.S. and Ph. D. degrees from the School of Electrical and Computer Engineering, Cornell University,
Ithaca, NY in 2001 and 2003 respectively. Currently, he is working at Silicon Laboratories, Austin, TX. He is a recipient
of the 2004 Leonard G. Abraham Award (with P. Venkitasubramaniam and L. Tong) from the IEEE Communications Society. His research
interests include signal processing, information theory, and random-access protocols.
Lang Tong received the B.E. degree from Tsinghua University, Beijing, China, in 1985, and M.S. and Ph.D. degrees in electrical engineering
in 1987 and 1990, respectively, from the University of Notre Dame, Notre Dame, Indiana. He was a Postdoctoral Research Affiliate
at the Information Systems Laboratory, Stanford University in 1991. Currently, he is a Professor in the School of Electrical
and Computer Engineering, Cornell University, Ithaca, New York.
Dr. Tong received Young Investigator Award rom the Office of Naval Research in 1996, and the Outstanding Young Author Award from the IEEE Circuits and Systems Society in 1991, the 2004 IEEE Signal Processing Society Best Paper Award (with M. Dong),
the 2004 Leonard G. Abraham Prize Paper Award from the IEEE Communications Society (with P. Venkitasubramaniam and S. Adireddy).
His areas of interest include statistical signal processing, adaptive receiver design for communication systems, signal processing
for communication networks, and information theory. 相似文献