MIMO-OFDM无线局域网中基于H.264/AVC和ParCast的混合数模视频传输

2014 21st International Conference on Telecommunications (ICT) Pub Date : 2014-05-04 DOI:10.1109/ICT.2014.6845146

Nianfei Fan, Yu Liu, Lin Zhang

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引用次数: 5

摘要

无线视频传输是无线局域网的主要应用之一。采用MIMO-OFDM技术可以实现高速视频传输。但传统的MIMO数字视频传输必须降低所有天线的性能，使其与信道增益最差的天线保持一致。基于H.264/AVC和ParCast，提出了在MIMO中传输H.264/AVC残差的数模混合方案，以进一步提高视频性能。通过对H.264/AVC压缩比和FEC码率的有效设计，为数字部分分配适当的功率，保证数字信号能够被准确解码。此外，本文提出的功率分配算法平衡了不同天线中数字信号的噪声干扰，使模拟误差最小化，模拟增益最大化。仿真结果表明，在各种信噪比的MIMO-OFDM信道上传输视频时，可以获得近乎完美的视频性能，并且该方案比ParCast方案的性能高出不少于8dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Hybrid digital-analog video transmission based on H.264/AVC and ParCast in MIMO-OFDM WLANs

Wireless video transmission is one of the main applications of wireless local area networks. And high-speed video transmission can be achieved with the application of MIMO-OFDM technologies. But the conventional digital video transmission in MIMO has to degrade performances of all the antennas to be the same as the antenna with the worst channel gain. Based on H.264/AVC and ParCast, a hybrid digital-analog scheme which transmits the residuals of H.264/AVC in MIMO to further improve video performance is proposed. With effective design of H.264/AVC compression ratio and FEC code rate, appropriate power is assigned to the digital part to guarantee the digital signal can be decoded accurately. Besides, the proposed power allocation algorithm balances the noise interferences of digital signal in different antennas, minimizes the analog errors and maximizes the analog gains. Simulations show that almost perfect video performance can be achieved when videos are transmitted over MIMO-OFDM channels with various SNRs, and our scheme outperforms the ParCast scheme by no less than 8dB.

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来源期刊

2014 21st International Conference on Telecommunications (ICT)

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