基于自适应STBC的多天线HDA视频传输方案

Adaptive STBC Scheme for Hybrid Digital Analog Video Transmission with Multiple Antennas

混合数字模拟(HDA)视频传输是一种新型的跨层传输技术,可以很好克服传统数字传输所引起的视频质量悬崖效应。该研究基于HDA的多天线软视频传输以取得高频谱效率和高传输速率,提出了一种基于自适应STBC的多天线HDA视频传输方案。方案根据数据包的重要性选择正交STBC(OSTBC)和准正交STBC(QSTBC):OSTBC用于传输最重要数据包,QSTBC用于传输次重要数据包,其他最不重要数据包被丢弃。在给定符号速率及不同的信道信噪比条件下,根据视频恢复质量最优,推导出传输数据包重排的闭式表达,并对传输的数据进行优化功率分配。实验结果表明,在4×1系统中,由于根据数据包的重要性自适应选择STBC,提出方案比纯OSTBC或纯QSTBC获得了0.2 dB~2 dB的质量提升。

Hybrid digital analog(HDA)video transmission is a new cross layer transmission technology,which can overcome the cliff effect of video quality caused by traditional video transmission.In this paper,multi antenna soft video transmission based on HDA is studied to achieve high spectral efficiency and high transmission rate,and an adaptive STBC scheme for multi antenna HDA video transmission is proposed.Orthogonal STBC(OSTBC)is used to transmit the most important packets,quasi-orthogonal STBC(QSTBC)is used to transmit the less important packets,and the other least important packets are discarded.The closed form expression of packet rearrangement is derived under the condition of given symbol rate and different channel signal-to-noise ratio.Experimental results show that such scheme provides 0.2 dB~2 dB quality improvement over pure OSTBC or QSTBC in 4×1 system.