HIGH SNR SUM CAPACITY ANALYSIS OF BD MIMO BC SYSTEMS WITH IMPERFECT CSI  

作　　者：Wang Jing Liu Zhanli Wang Yan You Xiaohu 

机构地区：[1]National Mobile Communications Research Lab,Southeast University, Nanjing 210096, China

出　　处：《Journal of Electronics(China)》2009年第2期145-151,共7页电子科学学刊（英文版）

基　　金：Supported by Chinese 863 Program (2006AA01Z268);the National Natural Science Foundation of China (No. 60496311)

摘　　要：We investigate the sum capacity of Block Diagonalization precoding Multiple Input Mul-tiple Output Broadcast Channels(BD MIMO BC) with imperfect Channel State Information(CSI) at the base station.Since it is difficult to obtain the exact expression,a lower and an upper bounds of the sum capacity under Gaussian channel estimation errors are drived instead.Analyses show that the gap between two bounds is considerably tight at all Signal to Noise Ratio(SNR) region.From the lower bound of the sum capacity,we can see that the multiplexing gain tends to be zero at high SNR region,which indicates that the BD MIMO BC system with channel estimation errors is interference-limited at high SNR.We investigate the sum capacity of Block Diagonalization precoding Multiple Input Mul-tiple Output Broadcast Channels（BD MIMO BC） with imperfect Channel State Information（CSI） at the base station.Since it is difficult to obtain the exact expression,a lower and an upper bounds of the sum capacity under Gaussian channel estimation errors are drived instead.Analyses show that the gap between two bounds is considerably tight at all Signal to Noise Ratio（SNR） region.From the lower bound of the sum capacity,we can see that the multiplexing gain tends to be zero at high SNR region,which indicates that the BD MIMO BC system with channel estimation errors is interference-limited at high SNR.

关 键 词：Block Diagonalization（BD） Multiple Input Multiple Output Broadcast Channels（MIMO BC） Imperfect Channel State Information（CSI） Sum capacity Multiplexing gain 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TP368.3[自动化与计算机技术—控制科学与工程]