两类多用户MIMO线性预编码的功率分配

Power allocation for two kinds of multi-user MIMO linear precoding

将多用户MIMO线性预编码分为干扰消除和干扰抑制两类,针对干扰消除中的块对角化(block diago-nalization,BD)迫零算法,讨论了经典注水功率分配,提出一种信噪比控制功率分配方案。该方案可使系统各子流接收信噪比相同,各个用户的误码性能一致,也可控制用户之间的任意信噪比比例;研究了干扰抑制类预编码的统一功率分配方案,提出一种针对存在干扰系统的适用于相关信道的迭代注水算法。该算法引入经典注水的思想,将干扰和噪声一并考虑。仿真结果表明,该算法在相关信道下使系统和容量获得了明显提高。

Multi-user MIMO linear precoding is classified as interference cancelation and interference suppression. Firstly,in the BD algorithm, discussed the classical wateffilling to maximize the sum capacity, proposed a SNR control power allocation scheme. The scheme could make all the substreams have the same SNR, so all the users had the same BER performance, and also the scheme could control the ratio of SNR among all the users. Secondly, did a research on unified power allocation for interference suppression precoding, proposed an interactive waterfilling algorithm for maximizing the sum capacity, especially in correlated channels. The algorithm ＇introduced the idea of classical waterfilling to the interference system, regarded the interference as noise. The simulation results indicate that the proposed algorithm improves the sum capacity efficiently in correlated channels.