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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。
In the wireless video transmission, the length of the data frame changes a lot and the source data rate keeps changing. According to the characteristics, a wireless video transmission system with low delay is proposed. The delay performance and bit error rate of the system are theoretically analyzed, and the minimum delay transmission scheme of the system is proposed. Under the transmission scheme, three kinds of relay selection strategies with different complexity are designed, that is, poor searching, deriving, sorting strategy. The simulation results show that using the system minimum delay transmission scheme for video transmission can reduce system bit error rate while guaranteeing system delay performance. As the number of optional relay nodes increases, the system bit error rate decreases. The error rate of the three different relay selection strategies is small. Compared with the poor search strategy, the derivative strategy and the sorting strategy have a lower algorithmic complexity, especially the complexity of the sorting strategy is only linear complexity.