无线高清视频传输系统的设计和跨层优化.doc

 n  无线高清视频传输系统的设计和跨层优化 李明亮1，刘丹谱2** （1. 北京邮电大学信息与通信工程学院； 5 10 15 20 25 30 35 40 2. 北京邮电大学无线通信系统与网络实验室，北京 100876） 摘要：无线视频传输已经在日常生活和工作中得到广泛应用，但支持高质量实时高清视频传 输的应用还很少。本论文的研究目标是寻求一个完整的高清视频传输系统设计方案，在满足 时延要求的同时尽可能优化视频传输质量。在对现有相关技术进行分析和整合的基础之上， 论文提出的整体解决方案由自上而下的三个层次组成：视频编码层、媒介接入层（MAC） 和物理层（PHY）。论文针对系统整体解决方案进行了分层仿真和跨层优化。各层的仿真结 果均满足系统设计指标要求。联合视频编码层、MAC 层和物理层的跨层优化系统能自适应 信道环境，动态选择编码参数和 MAC 层重传次数。仿真结果显示跨层优化后的系统能获得 更好的视频传输质量。 关键词：通信与信息系统；无线高清视频传输；视频编码；MAC 层；物理层；跨层优化 中图分类号：TN929.53 Design and Cross-Layer Optimization of a Wireless High-Definition Video Communication System Li Mingliang1, Liu Danpu2 (1. School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876; 2. Lab of Wireless Communication Systems and Networks, Beijing University of Posts and Telecommunications, Beijing 100876) Abstract: Wireless video has been widely used in daily life, but the application of real-time HD (high-definition) video transmission which requests very high throughput and low latencyis rare.The system designed in this paper can obtain high video transmission quality with satisfying the requested latency. The resolution of the wireless HD video transmission is consist of three layers: video code layer, MAC (media access control) layer and PHY (physical) layer. Simulation is adapted to the three layers of the system and the results satisfy the objective of the system. Joined video coder layer, MAC layer and PHY layer, Cross-layer optimization can be adaptive to the channel environment and select compression parameters, max number of retransmission and MCS (modulation and coding scheme). The cross-layer optimization simulation results show that the system has obtained higher quality than non-optimized system. Key words: telecommunication and information system; wireless high-definition video transmission; video code; MAC; PHY; cross-layer optimization 0 引言 为了满足人们对便携式无线接入和高清视频等宽带业务日益增长的需求，无线高清视频 传输技术应运而生。相关研究成果和产品已经在家用电子消费领域得到应用，实现了 PC、 电视、蓝