DSP在多媒体移动通信中的应用

随着多媒体移动通信技术的不断发展。数字信号处理(DSP)技术得到了广泛的应用。本文着重阐述了DSP在当今移动通信领域的应用情况。并对其在未来通信技术中的前景进行了展望。     

新一代多媒体DSP芯片—Mwave3780i

Mwave 3780i是IBM的新一代DSP芯片。同其前代MDSP 2780一样组合了DSP核心处理器及外围接口,能方便地同时即时处理不同来源的数字信号。这个芯片在许多方面做了重大改进,包括DSP核心、处理器的区域总线以及周边,这使得它能在更高的时钟脉冲频率下运行,增进了DSP程序码的效率,扩大了和外部器件连接的能力。     

一种适合多媒体处理的新型芯片

介绍ＭＭＸ技术的基本内容及带有ＭＭＸ技术的微处理器，以ＭＭＸ技术在视频会议系统上的应用为例，侧重分析ＭＭＸ技术给多媒体与通信应用带来的性能改善，并对ＭＭＸ技术的应用及发展前景进行探讨。     

用于多媒体显示的系统级芯片

TDP9320、STDP9210和STDP7320整合了DisplayPort1．2接收器和发射器与高清多媒体接口（HDMI）1．4接收器。DisplayPort1．2接收器／发射器可实现高达21．6Gbps的数据带宽,     

认知无线电在未来多媒体移动通信中的应用

未来的多媒体移动通信需要相当数量的频谱资源,认知无线电(cognitive radio)是软件无线电的特殊扩展,它使用了一类称为无线电礼仪协议(radio-etiquette protocol)的新协议,为灵活统筹无线电频谱提供了一个机制。本文介绍了无线电礼仪协议的结构并分析了认知无线电对频谱统筹可能的贡献。     

一种用DSP芯片实现的信道编码器

介绍一种用DSP芯片TMS320C50实现的信道编码器,它完成信道的RS编码,卷积交织功能。     

一种基于SCA的DSP软件无线电框架实现

在通信行业采甩SDR已是大势所趋,无论是民用还是军用领域都广泛采用这一概念。但是还没有一个框架能将DSP纳入到SDR系统中。为了提高SDR系统的性能,同时保证波形软件的可移植性和通用性,基于软件通信体系结构在DSP上设计实现了软件无线电框架。规范了在软件无线电产品中使用DSP的方法,提高了DSP波形组件的模块化程度及在不同平台上的可移植性和可重用性,使基于SCA的SDR的性能得以提高。     

MPEG-4多媒体移动通信系统的一种有效复用结构

介绍了一种基于MPEG－4标准的移动多媒体的两层复用结构。第一层对有相似服务质量（QoS）要求的基本数据流进行打包，形成具有较少QoS要求的数据流；第二层为每个数据流提供相应的防误码措施，形成可在易误码链路进行传输的单一数据流，达到既满足各个基本数据流防误码的要求,又使复用开销最小。     

一种多媒体IPTV的设计与实现

介绍了一种多媒体IPTV的设计和实现方案.硬件主要采用基于通用处理器的X86方案结合基于RISC架构的低成本兼容多种媒体的C2方案,软件主要采用嵌入武操作系统作为平台.分析了其与现有其他解决方案相比的优势及其市场前景.     

Implementation of a Wireless Multimedia DSP Chip for Mobile Applications

This paper presents the implementation of a wireless multimedia DSP chip for mobile applications. The implemented DSP chip supports communication instructions for Viterbi, timing synchronization, etc. as well as multimedia instructions. The DSP can handle variable length data and perform four MACs in a cycle. The proposed DSP employs parallel processing techniques, such as SIMD, vector processing, DSP schemes and adopts low power features for wireless applications. The implemented DSP chip includes test circuits and various peripherals, such as DMA, bus arbitration, timer, etc. This chip has been modeled by Verilog HDL and implemented using the 0.35 m HCB60 library. The total gate count excluding memory is about 170,000 gates and the clock frequency is 100 MHz.Junghoo Lee received the B.S. degree in electronic engineering from Ajou University, Suwon, Korea in 2002. He is currently working toward the Ph.D. degree with School of Electrical and Computer Engineering, Ajou University. His main research interests include SOC design and application-specific DSP chip design.Myung H. Sunwoo received the B.S. degree in electronic engineering from the Sogang University in 1980, the M.S. degree in electrical and electronics from the Korea Advanced Institute of Science and Technology in 1982, and the Ph.D. degree in electrical and computer engineering from the University of Texas at Austin in 1990.He worked for Electronics and Telecommunications Research Institute (ETRI) in Daejeon, Korea from 1982 to 1985 and Digital Signal Processor Operations, Motorola, Austin, TX from 1990 to 1992. Since 1992, he has been a Professor with the School of Electrical and Computer Engineering, Ajou University in Suwon, Korea. In 2000, he was a Visiting Professor in the Department of Electrical and Computer Engineering, the University of California, Davis, CA. He is the Director of the National Research Laboratory sponsored by the Ministry of Science and Technology. His research interests include VLSI architectures, SOC design for multimedia and communications, and application-specific DSP architectures.Dr. Sunwoo has published more than 120 papers in international transactions/journals and conferences and also has 28 patents including five U.S. patents. He served as a Technical Program Chair of the IEEE Workshop on Signal Processing Systems (SIPS) in 2003 and a member of the technical program committee of various international conferences. He has received a number of research awards from the Ministry of Commerce, Industry and Energy, Samsung Electronics, and professional foundations. He served as an Associate Editor for the IEEE Transactions on Very Large Scale Integration (VLSI) Systems (2002–2003) and as a Guest Editor for the Journal of VLSI Signal Processing (Kluwer, 2004). Currently, He is a Senior Member of IEEE and a Chair of the IEEE CAS Society of the Seoul Chapter.     

手机电视中多媒体芯片选型的建议

当前的手机不再是单纯用来通话、发短信的工具,而是融入了越来越多的娱乐特性:拍照、摄像、听音乐、看短片乃至看电视等,使得手机多媒体成为新的风向标。多媒体功能逐渐成为主流手机的标准配置,使其成为3G时代的一个主要应用。而多媒体芯片是决定手机多媒体性能优劣的关键因素,其选型至关重要。介绍选择多媒体芯片的具体方法和经验,从视频、音频和图像3个方面进行了描述。     

MPEG-4在无线/移动多媒体通信中的应用

本文围绕无线／ 移动多媒体通信的核心———图像传输， 重点阐述了 Ｍ Ｐ Ｅ Ｇ ４ 图像编码方式和 Ｈ２２３ Ａｎｎｅｘ 多路复用方式的抗误差性，同时简要介绍了在误差非常严重的无线传输环境中，日本东芝公司所进行图像通信的计算机仿真结果。     

Design of a Link Control Protocol for Multimedia Services in Wireless Local Communication

The convergence of wireless systems with multimedia services is the challengeof future generation wireless networks. The large variety of QoS requirementsof different media as well as the maintenance of synchronization of thedifferent streams to be presented at receiver, demand from the Data link layersome extra functionalities. In this paper, we present an enhanced approach forthe efficient management of multimedia applications in third-generationwireless networks. We advocate the use of multiple connections, one for eachtraffic component of the application, as the effective solution for thetransport of multimedia applications in future-generation wireless networks.The effectiveness of this scheme is guaranteed by providing a new link controltechnique that works on top of a PRMA-type access protocol which jointlymanages different streams of a multimedia application. For this purpose, wepropose a two-level priority mechanism (static and dynamic priorities)specified by higher protocol layers for link activation, channel access, andadmission control procedures specific to a multimedia application and foroptimizing the sharing of radio channel resources and management of thereservation queue at the base station. We expect this priority-based mechanismto perform well, especially during periods in which system traffic load ishigh, and to react well to the deterioration of multimedia service quality,in terms of both QoS parameters and the synchronization of its trafficcomponents.     

移动多媒体通信中无线AIM接入和结构

本文讨论移动多媒体通信中无线ＡＴＭ的基本概念和结构，包括无线ＡＴＭ概念，ＡＴＭ无线接入，无线ＡＴＭ网络，协议，信元和传输结构。研究无线信道给移动多媒体通信带来的影响和解决方法。     

W-CDMA无线多媒体通信系统设计考虑

为了研究和开发第三代移动通信系统,进行Ｗ－ＣＤＭＡ 无线多媒体通信系统和技术的研究十分必要。针对我们个人通信与扩频实验室正在研究开发国家８６３ 高技术通信主题Ｗ－ＣＤＭＡ无线多媒体通信技术的实验系统,我们提出了Ｗ－ＣＤＭＡ无线多媒体通信系统的系统结构,系统信道配置和功能安排,Ｗ－ＣＤＭＡ通信方式,分析了信号调制解调的性能,提出信号功率控制方法。     

无线多媒体通信技术和系统

文章基于能提供广泛应用的高速无线多媒体通信技术和系统的研究、开发情况,介绍和讨论了无线多媒体通信的体系结构、关键技术、典型系统和它的应用前景。     

Design and Implementation of a High-Performance and Complexity-Effective VLIW DSP for Multimedia Applications

This paper presents the design and implementation of a novel VLIW digital signal processor (DSP) for multimedia applications. The DSP core embodies a distributed & ping-pong register file, which saves 76.8% silicon area and improves 46.9% access time of centralized ones found in most VLIW processors by restricting its access patterns. However, it still has comparable performance (estimated in cycles) with state-of-the-art DSP for multimedia applications. A hierarchical instruction encoding scheme is also adopted to reduce the program sizes to 24.1∼26.0%. The DSP has been fabricated in the UMC 0.13 μm 1P8M Copper Logic Process, and it can operate at 333 MHz while consuming 189 mW power. The core size is 3.2 × 3.15 mm² including 160 KB on-chip SRAM.

基于移动Agent平台的多媒体无线情景仿真

在无线多媒体通信系统中,视频信源在发送端按照一定的编码方式进行编码,形成视频帧,然后在网络层和传输层封装成IP数据包,经过无线信道传输到达接收端,在接收端进行解包和恢复,得到视频帧,再形成重建后的视频流。在此过程中,无线信道的传输特性会影响到视频的传输质量。文中在利用Agent平台的基础上,综合NS2仿真工具,建立研究多媒体信息在无线网络中的传输平台。仿真结果表明,由于无线信道特性的不理想,在接收端恢复视频信息与视频信源相比较,会出现一定的失真     

移动多媒体通信关键技术研究

移动多媒体通信是未来通信的发展趋势。通过探讨移动多媒体通信数据量大、实时性要求高、无线信遗缺乏QoS保证等特点，介绍了和移动多媒体通信密切相关的几种技术：网络技术；视频编码技术、流媒体技术。