基于软件无线电的WCDMA仿真平台

本文介绍了一种关于3G的仿真平台的研究、开发和验证。结合软件无线电思想,参照3GPP协议,在COSSAP软件包中搭建起一个具有通用结构的、基于第三代WCDMA、FDD方式的下行链路物理层的仿真平台,并进行了Turbo编译码、RAKE接收机等3G关键技术的研究和单路数据业务、单路话音业务及多业务复用时系统性能的仿真验证。仿真结果与相关文献拟合得较好,结果证明可以把它作为进一步研究软件无线电中关键技术的基础平台。     

Instructions and hardware designs for accelerating SNOW 3G on a software-defined radio platform

Software-defined radio (SDR) is a new technology transitioning from research into commercial markets. SDR moves hardware-dominant baseband processing of multiple wireless communication protocols into software on a single chip. New cellular standards, such as HSPA+, LTE, and LTE+, require speeds in excess of 40 Mbps. SNOW 3G is a new stream cipher approved for use in these cellular protocols. Running SNOW 3G in software on our SDR platform provides a throughput of 19.1 Mbps per thread for confidentiality and 18.3 Mbps per thread for integrity. To have secure cellular communications in SDR platforms for these new protocols, the performance of security algorithms must be improved. This paper presents instruction set architecture (ISA) extensions and hardware designs for cellular confidentiality and integrity algorithms using SNOW 3G. Our ISA extensions and hardware designs are evaluated for the Sandbridge Sandblaster^? 3011 (SB3011) SDR platform. With our new SNOW 3G instructions, the performance of confidentiality and integrity improve by 70 and 2%, respectively. For confidentiality, power consumption increased by 2%, while energy decreased by 40%. For integrity, power consumption remained consistent, while energy decreased by 2%.     

Analysis and implementation of six-port software-defined radio receiver platform

With recent advances in semiconductor processing technology and the development of reconfigurable devices, high bit-rate software-defined radio (SDR) has become practical for commercial applications. This paper proposes an SDR receiver platform based on a new substrate integrated waveguide six-port structure. This SDR receiver platform operates from 22 to 26 GHz and it is designed to be robust, low cost, and suitable for different communication schemes. In this study, the receiver is demonstrated to support quadrature phase-shift keying and 16 quadrature amplitude modulation schemes. System-level simulation is made and prototype circuits are fabricated to evaluate the system performance. It is found that the combination of SDR and six-port technology can provide a great flexibility in system configuration, a significant reduction in system development cost, and also a high potential for software reuse. The proposed receiver shows a possible application of universal direct demodulator for future SDR terminals in various wireless communication systems.     

Denial of Service Prevention for 5G

5G wireless mobile communication is expected to include a large number of advanced technologies in order to further increase bandwidth, Quality of Service (QoS), improve usability and security, decrease delays and cost of service. Software Defined Radio (SDR) will be the platform for advanced terminals. Our focus is security and especially prevention of Denial of Service (DoS) attacks which we believe will become more common in commercial networks through increasing availability of easy programmable SDRs. We propose a secret version of Adaptive Frequency Hopping, as a possible 5G technology in combination with others, with QoS estimation by means of physical layer parameters. The QoS parameter chosen is Bit Error Rate (BER) and this we use for blacklisting frequencies that we assume are under DoS attack. Our experimental results on BER estimation show this to be a promising approach.     

Programmable processor implementations of -best list sphere detector for MIMO receiver

An increasing number of standards in wireless communications have encouraged to study programmable processors as platforms for flexible receivers. A multiple-input multiple-output (MIMO) antenna system combined with orthogonal frequency division multiplexing (OFDM) technique has been introduced in many wireless communications standards, such as in the third generation long term evolution (3G LTE). The MIMO-OFDM system requires an efficient detector and a platform support for parallel processing of multiple subcarriers. A K-best list sphere detector (LSD) provides for near optimal decoding performance and a fixed throughput making it an interesting algorithm from the point of view of practical implementations.In this paper, we compare the implementations of the K-best LSD on four processor platforms: a digital signal processor (DSP), software defined radio (SDR), application-specific processor (ASP) and application-specific instruction-set processor (ASIP). The DSP is a popular very long instruction word (VLIW) device (TMS320C6455), the SDR processor employs multithreading and multiple cores (SB3500 core processor), the ASP is based on transport triggered architecture (TTA), while the ASIP is the SDR processor enhanced with a special instruction-set extension for sorting.A 2×2 MIMO antenna system with 64-quadrature amplitude modulation (64-QAM) is assumed. The chosen list sizes K=8 and 16 are based on simulation results carried out in MATLAB environment with the third generation long term evolution (3G LTE) parameters. The proposed ASIP achieved a promising throughput of 32.0 Mbps, where the software defined radio (SDR) implementation on the SB3500 core processor suffers from an inefficient software sorter. The ASP, in which the minimized hardware complexity has been the goal, achieves a throughput of 7.6 Mbps. However, more essential examination is related to the symbol time, which sets strict parallel processing requirements to the programmable processors.     

Analyzing the Next Generation Software Defined Radio for Future Architectures

Commercial and research work in the field of software defined radio (SDR) has produced designs which have been able to deliver the efficiency and computational power needed to process 3G wireless technologies. Though efficient 3G processing has been achieved by these designs, next generation 4G SDR technology requires 10–1000x more computational performance but limits the power budget increase to 2–5x. In this paper, we present a breakdown of the major 4G kernels and analyze two methods of increasing performance and reducing power consumption. Specifically, we consider the effect of SIMD width and reduction in number of register file accesses on the performance and energy consumption of a SDR architecture, SODA. We show that by increasing SIMD width we can gain almost 2–8x performance increase while increasing total energy used by 1–2x for different SIMD widths. We also show that by reducing SIMD register accesses we can reduce the total energy used by 5–20% for the 4G kernels.     

基于软件无线电的智能天线探讨

智能天线作为第三代（3G）移动通信的关键技术,而在实际工程中是建立在期望信号来波方向（DOA）基础上的预多波束切换的方案。分析了智能天线的设计准则、算法以及设计方案。     

SDR——未来无线通信设备的基本概念

根据国际上的最新进展,本文对软件定义无线电（SDR）进行讨论和介绍。SDR是一个新的概念和体系,它是一个可重编程的可重构的,能支持多种无线通信体制和标准的无线通信设备。本文介绍了美国对SDR设备的要求,此技术为产品开发、制造商、运营商及最终用户带来了好处,以及SDR所面临的挑战。显然,在几年内,SDR技术将广泛使用于新一代通信产品的设计中,基于SDR的无线通信设备将成为市场中的主要部分。     

下一代移动技术的演进和路径动态研究

分析了我国移动通信技术超出第三代的技术轨迹,比较了不同的移动通讯技术标准平台,通过平台比较和技术竞争等方式模拟和绘制技术的演变过程,调查不同技术标准背后的不同利益相关者之间的相互作用。在新兴的移动产业背景下,我国未来移动技术发展的轨迹存在较高的不确定性,根据目前已形成的移动通信技术演进路线,探讨关键技术、商业和机构动态的驱动演变技术。     

Two Step Timing Synchronization Scheme for OFDM Signal in General Purpose Processor Based Software Defined Radio Receiver

Software defined radio (SDR) is a technology that allows a single terminal to support various kinds of wireless systems by changing its software to reconfigure itself. A general purpose processor (GPP) based SDR receiver platform named Sora has been recently developed by Microsoft. In the GPP based SDR receiver, timing synchronization of an OFDM signal consumes a significant amount of computational resources in the GPP. In this paper, a timing synchronization scheme which uses delayed correlation and matched filtering for the GPP based SDR platform is evaluated. The two stage timing synchronization scheme reduces the computational complexity by limiting the timing range of matched filtering. The proposed scheme reduces the amount of data transmission between the memory and the GPP of the SDR platform. It is shown through an experiment that the proposed scheme reduces the number of cycles for timing synchronization by up to 30 %.     

Multi-radio coexistence and collaboration on an SDR platform

In order to support the simultaneous use of both legacy and new radios in a multi-radio handset, a Software Defined Radio (SDR) platform needs to offer coexistence mechanisms and services for radios. This paper proposes an SDR control framework to provide the coexistence services and common interfaces for them. The multi-radio control in proposed platform is divided into two parts, the light-weight dynamic scheduling with tight real-time constraints to solve the temporal interoperability issues between radios, and the semi-dynamic admission control to perform the resource allocation when a radio changes its behavioral pattern. The control framework was implemented on a SDR technology demonstrator, to show how multiple simultaneously active radios are controlled, and how the coexistence mechanism can be used to provide tangible benefits to the SDR modem user, like the ability to utilize fine-grained spectral holes.     

GPON在3G接入平台的应用

GPON技术是新一代宽带无源光综合接入标准,具有大带宽、高效率、支持各种丰富的业务等优点,被视为实现接入网综合化、宽带化的理想技术.本文介绍了GPON各种技术的特点,结合3G接入平台对传输的要求,从GPON对3G各种类型接口的支持,实现多业务QoS的能力,时钟的保证等方面来分析GPON在3G接入平台的应用场景,进而提出适合GPON发展的应用模式和建议.     

基于软件无线电的数字调制信号自识别的研究

软件无线电的基本思想是构造一个具有开放性、标准化、模块化的通用硬件平台,通过软件编程来实现无线电台的各种功能。调制方式的多样化必然导致无线电台的多模式化。调制方式多样化的存在,就必须要具备自动识别各种调制方式的方法,所以,信号调制方式的自动识别是软件无线电中必须具备的功能之一。决策理论具有结构简单,识别种类多的优点,这也是本文采用决策理论的主要原因。最后仿真验证了决策理论是非常有效的。     

基于分层模型的终端调制解调重构研究

相比于传统单一接入功能终端以及多模终端,异构无线网络中的重构终端基于一个通用可重配置的软件无线电（SDR）平台实现不同接入功能,有效减少资源的利用。基于SDR分层设计思想,对终端调制解调重构实现建模进行研究。通过对四相相移键控信号（QPSK）和16QAM两种典型调制方式的调制解调重构仿真,并与传统终端进行比较,验证了所构建的终端调制解调重构模型的正确性,为终端重构实现技术的研究打下了基础。     

Power consumption benchmarking for reconfigurable platforms

Software defined radios (SDR) wideband mobile terminals must be capable of data processing while consuming low power and keeping the design and manufacturing costs as low as possible. SDR can combine high performance signal processing and flexibility, but power efficiency of SDR nodes is an issue that needs to be addressed. Analysis of power consumption for various target technologies is challenging, since each technology typically contains its own benchmarking tools and thus, results are not comparable. In this paper, we illustrate how the GroundHog2009 benchmark suite, designed to be platform independent, can be used to evaluate power dissipation of four modern FPGAs and one microcontroller. We also introduce a generic RTL library for the GroundHog2009 design cases and test bench infra-structure to make the toolset usage easy. In addition, we show that power can be saved by using clock management, available on one of the FGPA-boards. The power savings range from 38 to 1,150?%.     

Antenna design strategy and demonstration for software-defined radio (SDR)

Antennas are a key enabling technology for software-defined radio (SDR). Although software is extremely flexible, SDR??s potential is limited by antenna size and performance. In this paper, we review typical antenna miniaturization techniques and fundamental theories that limit antenna size and performance including operational bandwidth, gain (or range), and radiation pattern. Possible antenna design strategies are discussed to meet the desired specifications in SDR based on observations from the limit theories. The application of strategies to enable multiband (resonant), continuous multiband (frequency independent), and instantaneous, ultra-wideband antennas are discussed qualitatively. Advantages, disadvantages, and design trade-off strategies for different types of antennas are compared from a system-level perspective. A design example for a compact ultra-wideband (UWB) antenna is presented for a software-defined platform. The example involves a direct-conversion radio developed in Wireless@VT that uses a Motorola RFIC having a 100 MHz?C6 GHz operational frequency range with a 9 kHz?C20 MHz channel bandwidth. The example antenna covers frequencies from 450 MHz to 6 GHz instantaneously with approximately 5-dBi realized gain over a finite-size ground plane, including return loss and omni-directional coverage.     

软件无线电关键技术分析

作为当今无线通信领域的新技术——软件无线电SDR(Software-Defined Radio)应用前景十分广阔,正引起国内外越来越多的关注.本文介绍了软件无线电的概念、特点及体系结构,分析了软件无线电的关键技术,阐述了软件无线电的发展应用前景.     

3G技术在电视民生新闻直播中的应用

鉴于民生新闻直播中亟待突破的传播瓶颈,阐述电视民生新闻直播现状及基于3G的新闻直播系统的关键技术,介绍3G技术在电视直播中的系统实现原理以及在唐山广播电视台直播50分节目中的应用实践,在3G技术和民生新闻直播之间找到一个结合点,建立3G直播资讯技术平台。     

基于动态频谱接入的应急移动通信系统

新兴的动态频谱接入(DSA)技术可以解决频谱稀缺问题.本文在研究荷兰典型的下一代应急网络xGEN的基础上,分析了DSA在应急通信网络中的应用需求,设计了分级混合网络架构的DSA应急移动专用通信网络及其基于软件无线电(SDR)平台的快速可重配置的应急终端结构,并探讨了DSA设备特有的动态频谱管理功能实现的关键技术.     

一种新型软件无线电重构加载方法研究

介绍了一种基于软件无线电平台的重构加载方法,通过研究可重构软件无线电硬件体系结构,FPGA可执行设备重构加载原理、协议及Davinci系列处理器高速并行外部存储器接口(EMIF),提出了一种基于DSP+ FPGA的重构加载方案,实现了FPGA设备驱动和重构加载软件设计.实验结果表明,软件无线电重构加载方案可高速、准确、可靠地完成波形文件重构加载及不同通信模式的无缝切换.