Enhancing video quality for multiple-description MIMO transmission through unequal power allocation between eigen-modes
Enhancing video quality for multiple-description MIMO transmission through unequal power allocation between eigen-modes
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通过本征模式之间的不等功率分配提高多描述 MIMO 传输的视频质量
DOI：
10.1109/icip.2008.4712182
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
A. Doufexi
中科院分区：
文献类型：
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作者：
M. Tesanovic;D. Bull;A. Doufexi
多描述编码（MDC）作为一个合适的视频分解的MIMO（多输入多输出）无线传输，以前的一些作者报道，有前途的性能进一步提高，本文通过调查在MIMO系统中，采用奇异值分解（SVD）的功率分配。受注水功率分配策略的启发，结果表明，进一步改善传统的，单描述编码（SDC）是可能的，如果低信噪比，较强的子信道是以较弱的信道为代价提高。对于高SNR值，匡威亦然。一种简单而有效的功率分配策略，其中对于非常低（非常高）的SNR，大部分发射功率（考虑的最高值是十分之九）被分配给较强信道（较弱信道），从而在标称相等功率分配情况下，平均MDC PSNR得到高达4dB（1dB）的改进。低SNR值的PSNR增益甚至超过了注水产生的增益。
Promising performance of multiple-description coding (MDC) as a suitable video decomposition for MIMO (multiple-input-multiple-output) wireless transmission, reported previously by a number of authors, is further enhanced in this paper by investigating power allocation in MIMO systems that employ singular value decomposition (SVD). Inspired by the water-filling power allocation strategy, results demonstrate that further improvements over conventional, single-description coding (SDC) are possible if, for low SNRs, stronger sub-channel is boosted at the expense of the weaker channel. For high SNR values, the converse is true. A simple yet effective power allocation strategy whereby the bulk of the transmit power - the highest value considered was nine tenths - was allocated to the stronger channel (weaker channel) for very low (very high) SNRs yielded improvements of up to 4 dB (1 dB) in average MDC PSNR over the nominal - equal power allocation - case. The PSNR gains for low SNR values even exceeded the gains arising from water-filling.