The Problem with Disruption

Back in January 1995 Clayton Christensen and Joseph Bower wrote an article, Disruptive Technologies: catching the wave, in the Harvard Business Review, in which they argued: No matter the industry, a corporation consists of business units with finite life spans: the technological and market bases of any business will eventually disappear. Good businesses will often be adept at managing a process of incremental improvement, but this kind of incremental change, what they call sustaining technologies, is not the focus of this paper but rather disruptive technologies, which change the rules and leave established businesses with nowhere to go.     

Network computing

Network computing represents a new computing paradigm in which all information, data and software applications reside on a network and are accessed on demand by users. This approach to computing offers the potential for users to access everything from anywhere, removing the constraints of localised storage of information and applications, and, based on evolving standards, allowing access from a range of information appliances. This paper introduces the basic ideas behind network computing, and examines a range of forms it could take. It describes the current status of commercial network computing approaches, with particular emphasis on the use of the Java language, and examines the associated benefits and technical issues. A prototype BT system, developed using Java client software and CORBA-based middleware, is described.     

Performance Analysis of Distributed-Antenna Communication Systems Using Beam-Hopping Under Strong Directional Interference

In order to efficiently mitigate the interference of directional jammers, we investigate a beam-hopping (BH) communication scheme, which includes slow beam-hopping (SBH) and fast beam-hopping (FBH) schemes. In the BH communication scheme, only one pair of the beams is used for transmission and it hops from one to the next according to an assigned BH pattern. In this contribution, a range of expressions in terms of the symbol error rate (SER) performance of the BH and conventional single-beam (SB) schemes have been derived, when both the downlink and uplink are considered. The SER performance of the BH scheme is compared with that of the SB scheme, for M-ary phase-shift keying (MPSK) and M-ary quadrature amplitude modulation (MQAM) signals under composite log normal shadowing/Nakagami-m fading channels. Our analysis and results show that the proposed BH scheme is suitable for communications, when several distributed antenna arrays are available around a mobile.Honglin Hu received his Ph.D in Communications and Information System from the University of Science and Technology of China, 2004. Currently he is with Future Radio, Siemens AG Communications in Munich, Germany. In Siemens, he makes researches mainly on SDMA and OFDM techniques, also on the cross-layer design and optimization for future wireless communication systems. Dr. Hu is a member of IEEE.Jinkang Zhu is a professor of Department of Electronic Engineering & Information Science of University of Science and Technology of China (USTC). Now he is director of Personal Communication Network and Spread Spectrum Lab. of USTC, Chair of the Academic Committee of School of Information Science & Technology of USTC, Vice-Chair of the Academic Committee of USTC.He was Permanent V-President of School of Information Science & Technology of USTC, Chairman of PCN Experts Group of Communication Project of National R&D on High-Technology Programme of China, Member of Information Technology Expert Group of the Chinese Academy of Sciences, Member (Representation of China Mainland) of Technical Forum on Wireless Communications of Asia Pacific Region, Member of Technical Advisory Committee of IEEE VTC99 Fall, Member of Technical Program Committee of IEEE VTC2000, Member of Technical Program Committee of SCI2001.His research area is Wireless and Mobile Communications, CDMA and Spread Spectrum Communications, Signal Process of Communications, and Wireless Networks. He got two awards of Ministry of Science & Technology of China, three awards of Chinese Academy of Science. He published five books and 100 papers, where synchronous CDMA method proposed is used in TD-SCDMA Standard of 3G as basic technology.     

Detection of Defects Using Fault Model Oriented Test Sequences

This paper analyzes the possibilities and limitations of defect detection using fault model oriented test sequences. The analysis is conducted through the example of a short defect considering the static voltage test technique. Firstly, the problem of defect excitation and effect propagation is studied. It is shown that the effect can be either a defective effect or a defect-free effect depending on the value of unpredictable parameters. The concept of Analog Detectability Interval (ADI) is used to represent the range of the unpredictable parameters creating a defective effect. It is demonstrated that the ADIs are pattern dependent. New concepts (Global ADI, Covered ADI) are then proposed to optimize the defect detection taking into account the unpredictable parameters. Finally, the ability of a fault oriented test sequence to detect defect is discussed. In particular, it is shown that the test sequence generated to target the stuck-at faults can reasonably guarantee short defect detection till a limit given by the Analog Detectability Intervals.     

Pervasive Home Environments

For decades, technologists have been promising the intelligent house. The vision is usually portrayed as a house filled with technology which will do the dweller's bidding and take all domestic drudgery out of their lives. The truly intelligent house is still some way off, but the emergence of broadband, availability of faster, smaller and ever cheaper computing equipment and a variety of wired and wireless network technologies are enabling technologies that bring this vision closer to reality. These technology trends lead to the concept that computing and other smart devices will become pervasive, fully networked and disappear into the infrastructure of the home. People will carry out their tasks unaware of the complexity of the infrastructure that supports their activities in much the same way as people today use mains electricity.This paper introduces these concepts and discusses the technological challenges to be overcome. We present our vision of the pervasive home environment where inhabitants can focus on tasks rather than the technology: I need to create X and send it to Y rather than I need to use this computer and this application which needs access to service A and resource B. Although this sounds simple, the environment needs to understand who I is, and who or what Y is. Appropriate permissions must be in place and resources allocated, if available. The most appropriate interface for the task and user must be determined.The pervasive, intelligent home will make available new ways to access and share information. It will herald new services, such as care and support of people in the home, entertainment, educational and security services. The final part of the paper discusses the commercial opportunities and challenges which must be met, not least the need for industry to agree on open standards and interfaces.     

On the performance of packet-switched cellular networks for wireless data communications

Cellular frequency reuse is known to be an efficient method to allow many wireless telephone subscribers to share the same frequency band. However, for wireless data and multi-media communications optimum cell layouts differ essentially from typical solutions for telephone systems. We argue that wireless radio systems for bursty message traffic preferably use the entire bandwidth in each cell. Packet queuing delays are derived for a network with multipath fading channels, shadowing, path loss and discontinuously transmitting base stations. Interference between cells can be reduced by appropriately scheduling transmissions or by spatial collision resolution.Portions of this paper have been presented at the IEEE International Conferences on Personal Indoor Mobile Radio Communications (PIMRC) of 1993 in Yokohama and 1994 in The Hague.     

New Models of Prefix Adder Topologies

This paper introduces a variety of approaches for assessing logarithmic-depth parallel prefix adders: a delay model based on a slight modification to the Logical Effort methodology is derived; a simple area model based on wire pitch is described; a new parameter, span(i), is defined that provides a mechanism for determining cell count and whether a prefix tree exhibits idempotency. The models are tested against Knowles Family of Adders and found to give results that are within 5% of those reported by Knowles, as well as allowing a full assessment of the family to be made. Finally, the delay and area models are used to assess the Flagged Prefix Adder, an enhanced adder capable of computing absolute differences.Neil Burgess Ph.D., M.Sc., B.Sc., was awarded a PhD by Southampton University (U.K.) in 1986 for his work on graph theoretic techniques to model failure mechanisms in MOS VLSI circuits. He then spent two years designing DSP VLSI chips at GECs Hirst Research Labs in Wembley, London, before moving to academia to lecture in Microelectronic Systems, first at Brunel University, London, then for 6 years at the University of Adelaide, Australia. In 1996, he was appointed Director of the University of Adelaides Centre for High-Performance Technology and Systems, whose major research activity was centred on the design of high-performance digital microelectronic circuits. In 1999, he returned to the U.K. to take up a Professorial Research Fellowship in the Division of Electronics at Cardiff Universitys School of Engineering. His research activities in these posts have revolved around digital VLSI design in both CMOS and GaAs, and high-speed arithmetic processing, expanding this work to address applications including cryptography, image compression, and DSP. In October 2003, he left the academic sector to join Icera Semiconductor, a silicon start-up company whose design office is in Bristol, UK. He has published over 80 papers and is an associate editor of the IEEE Transactions of Computers. He co-chaired the 14th and 15th IEEE Symposia on Computer Arithmetic (in 1999 and 2001), the 13th IEEE International Conference on Application-Specific Systems Architectures and Processors (2002), and the 37th and 38th IEEE Asilomar Conference on Signals, Systems and Computers (2003 and 2004).     

Year 2000 — a Sytems Integration challenge

BT, along with virtually every other IT-dependent business worldwide, is tackling a problem which is quite unique and if not corrected could be disastrous. The problem, sometimes known as the Year 2000 bug or millennium time bomb, has been caused by the use of two digits to represent the year in the majority of our systems and applications. The problem is technically not difficult to fix but the volume of changes occurring, and the need to potentially test every system to ensure that it is year 2000 proof, presents unique and challenging difficulties for integration and testing. Why this is the case, what problems need to be addressed, and an overview of some of the proposed integration and test strategies to tackle these problems, is the subject of this paper.     

Performance Monitoring for In-life Capacity Management

The key to providing a meaningful management view of the performance of complex systems lies in having a co-ordinated process for data collection, analysis and presentation. TeleMarketing Services, such as the Freefone service, provide a good example. Managers of diverse, remote subsystems receive summarised performance and customer service information, mostly in the form of simple graphs, in exchange for providing reliable data. The aim is to bring together a structured view of all the components, including a red-amber-green status table, for use by senior customer-facing staff. Generally, the analyses focus on capacity, forecast and measurement, covering a flexible range of parameters. Managers then have an early view of service degradation, potential capacity exhaustion, workload imbalance and resource wastage, enabling timely remedial action, fault clearance and system enhancements.     

Why ‘Current Mode’ Does Not Guarantee Good Performance

It is often said that there is a fundamental difference between current-mode and voltage-mode circuits. This conjecture is discussed in technical and philosophical terms, and it is shown that there is no such performance difference to be found, and that it is not possible to make a clear divide between voltage mode and current mode.And yet performance differences appear in the literature. It is shown that they come from the different design practices of the current-mode and the voltage-mode research groups. The conclusion of this paper is that the practical knowledge of the current-mode research groups should be re-integrated into main-stream IC design, and that all propaganda of the type current-mode is better than voltage-mode should be stopped immediately.     

Fully Complex Multi-Layer Perceptron Network for Nonlinear Signal Processing

Designing a neural network (NN) to process complex-valued signals is a challenging task since a complex nonlinear activation function (AF) cannot be both analytic and bounded everywhere in the complex plane . To avoid this difficulty, splitting, i.e., using a pair of real sigmoidal functions for the real and imaginary components has been the traditional approach. However, this ad hoc compromise to avoid the unbounded nature of nonlinear complex functions results in a nowhere analytic AF that performs the error back-propagation (BP) using the split derivatives of the real and imaginary components instead of relying on well-defined fully complex derivatives. In this paper, a fully complex multi-layer perceptron (MLP) structure that yields a simplified complex-valued back-propagation (BP) algorithm is presented. The simplified BP verifies that the fully complex BP weight update formula is the complex conjugate form of real BP formula and the split complex BP is a special case of the fully complex BP. This generalization is possible by employing elementary transcendental functions (ETFs) that are almost everywhere (a.e.) bounded and analytic in . The properties of fully complex MLP are investigated and the advantage of ETFs over split complex AF is shown in numerical examples where nonlinear magnitude and phase distortions of non-constant modulus modulated signals are successfully restored.     

The Supply Chain

One of the most visible examples of ubiquitous computing poised for implementation can be found in the retail industry. Radio frequency identification (RFID) tags are being billed as the replacement for barcoding, the all-pervasive technology which has underpinned supply chains for the past 35 years. The standards allow for up to thirty trillion, trillion, trillion unique addresses, and the ultimate goal is to create an Internet of things in which everyday physical items are networked together. Concerted research effort over the past five years has developed the technology and reduced cost to a point where deployment is now possible. However, the recent heated debate centred on spy chips has highlighted the fact that one person's ubiquitous computing is another person's Big Brother state.     

Controlling Inductive Coupling in Wide Global Signal Busses Through Swizzling

Recent advances in Deep Submicron (DSM) design and manufacturing technologies have brought to the forefront the importance of inductive coupling amongst long interconnect in high performance microprocessors. Inductive coupling has been shown to depend directly on the overlap length between adjacent signal wires, the activity on these wires and the distance separating them. This paper presents a technique—known as swizzling—that exploits the inductive coupling dependence on distance to reduce the effect of any particular attacker on any of its victims. In the swizzling technique, the order of signal wires in global signal busses is continuously re-arranged to move attackers and victims away from each other. This paper shows that this technique significantly reduces the inductive coupling for the most vulnerable wires neighboring the attacker with zero area and routing resource penalty.Bassel Soudan (S89, M94) received his B.Sc. degree in Electrical Engineering with highest honors from the Department of Electrical Engineering and Computer Science at the University of Illinois at Chicago in 1986. He received his M.Sc. and Ph.D. degrees in 1988 and 1994 respectively from the Department of Electrical and Computer Engineering at the Illinois Institute of Technology.From 1994 through 1996, he was with Design Technology group at Intel Corporation in Hillsboro Oregon where he was involved in the development of Intels Athena suite of EDA CAD tools. He was particularly involved with the design of full chip layout tools and then the verification and validation effort of the suite. From 1996 through 1999, he was with the Merced Microprocessor Design Team at Intel in Santa Clara California. He was a member of the Full-Chip Layout Design Automation team responsible for developing, maintaining, and supporting the suite of full chip layout tools utilized by the project. In the last six months of the project, he was part of the team responsible for assembling and verifying the design. Since 1999, he is an assistant professor at the Department of Electrical/Electronics and Computer Engineering at the University of Sharjah in the United Arab Emirates. His primary research interests include interconnect design, high performance computer architecture and design of new EDA tools and methodologies.He is a member of the IEEE, the IEEE Circuits and Systems Society, the IEEE Computer Society, the ACM, the ACM Special Interest Group on Design Automation, and the ACM Special Interest Group on Microarchitecture.     

Fast Converging Adaptive MMSE Multiuser Detector for DS-CDMA System

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.     

Long-Term Business Modelling Using System Dynamics

This paper presents an overview of the methodology used to model the resource allocation decisions of a research organisation using system dynamics. The resulting model combined the concept of aging chains and co-flows of System Dynamics with conventional spreadsheet analysis, and included representations of staff development and turnover; patent development and licensing revenue; and revenue from other sources. Using the model, senior management were able to evaluate the impact over the coming years of different resource allocation strategies.     

Iterative Decoding of Orthogonal Space-Time Coded CPM Systems

We present an iterative decoding/demodulation technique for an orthogonal space-time coded continuous-phase modulation (OST-CPM) system. A low-complexity soft input and soft output (SISO) demodulator is developed based on the bidirectional soft output Viterbi algorithm (BSOVA) for the multiple antennas CPM systems. By taking advantage of the orthogonal structure, the complexity of extrinsic information extraction can be significantly reduced at each iteration.Shengli Fu received the B.S. and M.S. degree in telecommunication engineering from Beijing University of Posts and Telecommunications, Beijing, China, in 1994 and 1997, respectively. In 2000, he enrolled at the Wright State University, Dayton, OH, where he received the M.S. degree in Computer Engineering. He currently pursues his Ph.D. degree in the Department of Electrical and Computer Engineering at the University of Delaware.His research interests include information and coding theory, MIMO wireless communication systems, and acoustic and visual signal processing.Genyuan Wang received B.Sc and MS. degrees in Mathematics from the Shanxi Normal University, Xian, China, in 1985 and 1988, respectively, and his Ph.D. degree in Electrical Engineering from Xidian University, Xian China, in 1998.From July, 1988 to September 1994, he worked at Shanxi Normal University as an Assistant Professor and then an Associate Professor. From September 1994 to May 1998, he worked at Xidian University as a research assistant. Currently, he is Post-Doctoral Fellow at Department of Electrical and Computer Engineering, University of Delaware. His research interests are radar imaging and radar signal processing, adaptive filter, OFDM system, channel equalization and space-time coding.Xiang-Gen Xia (M97,S00) received his B.S. degree in mathematics from Nanjing Normal University, Nanjing, China, and his M.S. degree in mathematics from Nankai University, Tianjin, China, and his Ph.D. degree in Electrical Engineering from the University of Southern California, Los Angeles, in 1983, 1986, and 1992, respectively.He was a Senior/Research Staff Member at Hughes Research Laboratories, Malibu, California, during 1995--1996. In September 1996, he joined the Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware, where he is a Professor. He was a Visiting Professor at the Chinese University of Hong Kong during 2002–2003. Before 1995, he held visiting positions in a few institutions. His current research interests include space-time coding, MIMO and OFDM systems, and SAR and ISAR imaging. Dr. Xia has over 100 refereed journal articles published, and 6 U.S. patents awarded. He is the author of the book Modulated Coding for Intersymbol Interference Channels (New York, Marcel Dekker, 2000).Dr. Xia received the National Science Foundation (NSF) Faculty Early Career Development (CAREER) Program Award in 1997, the Office of Naval Research (ONR) Young Investigator Award in 1998, and the Outstanding Overseas Young Investigator Award from the National Nature Science Foundation of China in 2001. He also received the Outstanding Junior Faculty Award of the Engineering School of the University of Delaware in 2001. He is currently an Associate Editor of the IEEE Transactions on Mobile Computing, the IEEE Signal Processing Letters, the IEEE Transactions on Signal Processing, the International Journal of Signal Processing, and the EURASIP Journal of Applied Signal Processing. He was a guest editor of Space-Time Coding and Its Applications in the EURASIP Journal of Applied Signal Processing in 2002. He is also a Member of the Signal Processing for Communications Technical Committee and the Sensor Array and Multichannel (SAM) Technical Committee in the IEEE Signal Processing Society.     

Downlink Dimensioning for the HSDPA Standard

We present an analytic derivation of downlink dimensioning for a wireless network employing the High Speed Downlink Packet Access (HSDPA) standard [Moulsley, Conference Publication No. 477, IEE 2001], currently being developed by the 3rd Generation Partnership Project (3GPP) [http://www.3gpp.org] as part of the next stage in the evolution of the WCDMA standard. We determine the maximum possible cell radius such that the probability of outage, P_out, at the cells worst location does not exceed a preset value under full load condition. The results of the paper are presented in the form of curves obtained by numerical integration of integral expressions. The results can be used, for instance, to find the increase in cell radius achievable by a certain reduction in the threshold value of the Signal to Interference plus Noise Ratio (SINR) defining outage.Parts of this work were presented at the 2002 IEEE Wireless Personal Multimedia Communications conference (WPMC), Hawaii.Dan Avidor was born in Tel Aviv, Israel, on October 18, 1936. He received the B.Sc. degree in electrical engineering from the Technion-Israel Institute of Technology, Haifa, Israel, in 1958 and the M.Sc. and Ph.D. degrees in engineering from the University of California, Los Angeles, (UCLA) in 1970 and 1981, respectively. After completing his studies for the Ph.D. degree, he returned to Israel, where he served as a Research and Development Department Head in the Israeli defense forces. He is currently a Distinguished Member of Technical Staff in the Wireless Research Laboratory, Bell Labs, Lucent Technologies, NJ, USA. His current research interests are in adaptive arrays, signal processing, and simulation techniques for wireless systems.Sayandev Mukherjee (M92) was born in Bangalore, India in 1970. He received the Bachelor of Technology degree in electrical engineering from the Indian Institute of Technology, Kanpur, India, in 1991, and the M.S. and Ph.D. degrees in electrical engineering from Cornell University, Ithaca, NY, in 1994 and 1997, respectively. Since 1996, he has been a Member of Technical Staff in the Wireless Research Laboratory, Bell Labs, Lucent Technologies, NJ, USA. His research interests include stochastic models, wireless system simulations, and intelligent resource allocation in wireless systems.     

VLSI Architecture for Lifting-Based Shape-Adaptive Discrete Wavelet Transform with Odd-Symmetric Filters

In this paper, a VLSI architecture for lifting-based shape-adaptive discrete wavelet transform (SA-DWT) with odd-symmetric filters is proposed. The proposed architecture is comprised of a stage-based boundary extension strategy and the shape-adaptive boundary handling units. The former could reduce the complexity of multiplexers that are introduced to solve the shape-adaptive boundary extension. The latter consists of two multiplexers and can solve the shape-adaptive boundary extension locally without any additional register. Two case studies are presented, including the JPEG 2000 default (9, 7) filter and MPEG-4 default (9, 3) filter. According to comparison results with previous architectures, the efficiency of the proposed architectures is proven.Chao-Tsung Huang was born in Kaohsiung, Taiwan in 1979. He received the B.S. degree from the Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan in 2001. He is currently working toward the Ph.D. degree at the Graduate Institute of Electronics Engineering, National Taiwan University. His major research interests include VLSI design and implementation for 1-D, 2-D, and 3-D Discrete Wavelet Transform. cthuang@video.ee.ntu.edu.twPo-Chih Tseng was born in Tao-Yuan, Taiwan in 1977. He received the B.S. degree in Electrical and Control Engineering from National Chiao Tung University in 1999 and the M.S. degree in Electrical Engineering from National Taiwan University in 2001. He currently is pursuing the Ph.D. degree at the Graduate Institute of Electronics Engineering, Department of Electrical Engineering, National Taiwan University. His research interests include VLSI design and implementation for signal processing systems, energy-efficient reconfigurable computing for multimedia systems, and power-aware image and video coding systems. pctseng@video.ee.ntu.edu.twLiang-Gee Chen (S84–M86–SM94–F01) received the B.S., M.S., and Ph.D. degrees in electrical engineering from National Cheng Kung University, Tainan, Taiwan, R.O.C., in 1979, 1981, and 1986, respectively.In 1988, he joined the Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, R.O.C. During 1993–1994, he was a Visiting Consultant in the DSP Research Department, AT&T Bell Labs, Murray Hill, NJ. In 1997, he was a Visiting Scholar of the Department of Electrical Engineering, University of Washington, Seattle. Currently, he is Professor at National Taiwan University, Taipei, Taiwan, R.O.C. His current research interests are DSP architecture design, video processor design, and video coding systems.Dr. Chen has served as an Associate Editor of IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY since 1996, as Associate Editor of the IEEE TRANSACTIONS ON VLSI SYSTEMS since 1999, and as Associate Editor of IEEE TRANSACTIONS CIRCUITS AND SYSTEMS II since 2000. He has been the Associate Editor of the Journal of Circuits, Systems, and Signal Processing since 1999, and a Guest Editor for the Journal of Video Signal Processing Systems. He is also the Associate Editor of the PROCEEDINGS OF THE IEEE. He was the General Chairman of the 7th VLSI Design/CAD Symposium in 1995 and of the 1999 IEEE Workshop on Signal Processing Systems: Design and Implementation. He is the Past-Chair of Taipei Chapter of IEEE Circuits and Systems (CAS) Society, and is a member of the IEEE CAS Technical Committee of VLSI Systems and Applications, the Technical Committee of Visual Signal Processing and Communications, and the IEEE Signal Processing Technical Committee of Design and Implementation of SP Systems. He is the Chair-Elect of the IEEE CAS Technical Committee on Multimedia Systems and Applications. During 2001–2002, he served as a Distinguished Lecturer of the IEEE CAS Society. He received the Best Paper Award from the R.O.C. Computer Society in 1990 and 1994. Annually from 1991 to 1999, he received Long-Term (Acer) Paper Awards. In 1992, he received the Best Paper Award of the 1992 Asia-Pacific Conference on circuits and systems in the VLSI design track. In 1993, he received the Annual Paper Award of the Chinese Engineer Society. In 1996 and 2000, he received the Outstanding Research Award from the National Science Council, and in 2000, the Dragon Excellence Award from Acer. He is a member of Phi Tan Phi. lgchen@video.ee.ntu.edu.tw     

Unified IP Networks

Corporations are looking to harness the flexibility and ubiquity of IP as a means of automating key business transactions and increasing efficiency. As part of this eRevolution corporate businesses are looking at migrating new applications on to their existing IP infrastructures.Computer/telephony integration and unified messaging are applications that will drive forward the integration of voice and data networks for BT's corporate customers, enabling the use of a flexible, shared IP infrastructure for voice and data.While voice over IP is widely seen as the obvious way forward there are many issues to be resolved before this can deliver the anticipated benefits. This paper provides an insight into the building blocks required to enable the development/deployment of shared infrastructure, for quality of service (QoS) capable, unified, IP network solutions. It highlights the detailed understanding and careful design approach required (particularly in the complex area of network QoS) to engineer custom voice solutions as part of a unified IP network design based on today's technology. Emerging protocols and technology, which may turn the unified network dream into reaility, are identified.     

A General Approach for Image and Co-Channel Interference Suppression in Diversity Wireless Receivers Employing ICA

In this contribution, a general approach to suppress image signal and co-channel interference in a wireless receiver is presented. The technique employs diversity reception, and the algorithm is based on complex-valued independent component analysis (ICA). The proposed ICA method increases the channel capacity through greater frequency reuse, and it simplifies the receivers front end by eliminating the need for analog image filtering. Also, the new technique is computationally efficient and has attractive implementation features in terms of the requirement for A/D converters speed and bandpass filters selectivity. Simulation results show that the performance is robust over a wide range of input signal-to-interference ratios, and the algorithm has fast convergence.