Power allocation for two kinds of multi-user MIMO linear precoding
ZHU Kai,HU Han-ying,CUI Wei-jia
(Institute of Information Engineering,PLA Information Engineering University, Zhengzhou 450002, China)
Abstract:Multi-user MIMO linear precoding is classified as interference cancelation and interference suppression.Firstly,in the BD algorithm,discussed the classical waterfilling 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. ......