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arXiv cs/0612007cs.ITmath.IT
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MIMO广播信道的高SNR分析:脏纸编码与线性预编码

High SNR Analysis for MIMO Broadcast Channels: Dirty Paper Coding vs. Linear Precoding

Juyul Lee, Nihar Jindal

摘要:

我们研究了MIMO广播信道,并将脏纸编码的最优策略的可实现吞吐量与次优和较低复杂度的线性预编码(例如,迫零和块对角化)传输。这两种策略都利用了所有可用的空间维度,因此具有相同的复用增益,但在吞吐量方面确实存在绝对差异。这两种策略之间的总和速率差分析计算在渐近高SNR,可以看出,这种渐近统计提供了一个准确的表征,即使在中等SNR水平。此外,当每个用户a具有不同的平均SNR时,该差异不受非对称信道行为的影响。加权和速率最大化也被认为是,并进行类似的量化的吞吐量之间的差异,这两种策略。在这个过程中,它表明,用户的权力分配成正比的用户权重渐近最大化加权和率。对于多天线用户,在与用户权重成比例地分配功率之后,跨接收天线的均匀功率分配被应用。

英文摘要:

We study the MIMO broadcast channel and compare the achievable throughput for the optimal strategy of dirty paper coding to that achieved with sub-optimal and lower complexity linear precoding (e.g., zero-forcing and block diagonalization) transmission. Both strategies utilize all available spatial dimensions and therefore have the same multiplexing gain, but an absolute difference in terms of throughput does exist. The sum rate difference between the two strategies is analytically computed at asymptotically high SNR, and it is seen that this asymptotic statistic provides an accurate characterization at even moderate SNR levels. Furthermore, the difference is not affected by asymmetric channel behavior when each user a has different average SNR. Weighted sum rate maximization is also considered, and a similar quantification of the throughput difference between the two strategies is performed. In the process, it is shown that allocating user powers in direct proportion to user weights asymptotically maximizes weighted sum rate. For multiple antenna users, uniform power allocation across the receive antennas is applied after distributing power proportional to the user weight.

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