【摘要】 无线视频传输中数据帧长度变化较大,信源数据速率不断变动,根据该特点提出了低延时无线协作视频传输系统。从理论上分析了该系统的延时性能和误码率,提出了系统最小延时传输方案。在该传输方案下,设计了3种不同复杂度的中继选择策略,即穷搜、衍生、排序策略。仿真结果表明:采用系统最小延时传输方案进行视频传输,可以在保证系统延时性能的基础上降低系统误码率。随着可选中继节点数量的增加,系统误码率逐渐降低。3种不同中继选择策略的误码率差距不大。相较于穷搜策略,衍生、排序策略具有更低的算法复杂度,尤其是排序策略的复杂度仅为线性复杂度。更多还原

【Abstract】 In wireless video transmission systems,the length of the frame changes and the source bit rate varies during transmissions.This paper describes a wireless cooperative video transmission system with low latency to reduce the system delay.The delay and the bit error rate(BER) of the system are analyzed theoretically to develop a minimum delay transmission scheme.Then three relay selection strategies with different complexities are developed for the scheme.Simulations show that the minimum delay transmission scheme can reduce the system BER and the performance gain becomes more noticeable as the number of relay nodes increases.Though the BER of the different relay selection strategies are similar,the recurrence and relay ordering strategies are much less complex than the brute force strategy,with the relay ordering strategy having linear complexity.更多还原