ERGODIC CAPACITY FORMULA OF MIMO-OFDM SYSTEMS UNDER CORRELATED FREQUENCY SELECTIVE RAYLEIGH FADING CHANNELS  

作　　者：Pang Jiyong Li Jiandong Zhao Linjing 

机构地区：[1]Broadband Wireless Communications Lab, Information Science Institute,State Key Lab of Integrated Service Networks, Xidian University, Xi＇an 710071, China

出　　处：《Journal of Electronics(China)》2007年第5期588-592,共5页电子科学学刊（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No.60372048);Microsoft Research Asia,the sixth project of the Key Project of National Natural Science Foundation of China (No.60496316);National"863"Program of China (No.2005AA123910);Research Fund for the Doctoral Program of Higher Education (No.20050701007);Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE,P.R.China,and the Key Project of Chinese Ministry of Education (No.104171).

摘　　要：An explicit formula for the ergodic capacity of Orthogonal Frequency Division Multiplexing (OFDM)-based Multiple-Input Multiple-Output (MIMO) systems under correlated frequency selective Rayleigh channels is derived,by simplifying the channel response matrix in frequency domain into the so-called Kronecker model composed of three kinds of correlations,i.e.multipath tap gain correlation and spatial fading correlations at both transmitter and receiver.The derived formula is very simple and convenient for one to estimate the effects of all three kinds of correlations on MIMO-OFDM capacity.If taps are independent,there is a very simple expression for the ergodic capacity.In case of tap correlation,the capacity formula could be further given in an integral expression.The validity of the new formula is verified and the effects of correlations,delay spread as well as the number of subcarriers on the ergodic capacity are evaluated via Monte Carlo simulations.An explicit formula for the ergodic capacity of Orthogonal Frequency Division Multiplexing （OFDM）-based Multiple-Input Multiple-Output （MIMO） systems under correlated frequency selective Rayleigh channels is derived, by simplifying the channel response matrix in frequency domain into the so-called Kronecker model composed of three kinds of correlations, i.e. multipath tap gain correlation and spatial fading correlations at both transmitter and receiver. The derived formula is very simple and convenient for one to estimate the effects of all three kinds of correlations on MIMO-OFDM capacity. If taps are independent, there is a very simple expression for the ergodic capacity. In case of tap correlation, the capacity formula could be further given in an integral expression. The validity of the new formula is verified and the effects of correlations, delay spread as well as the number of subcarriers on the ergodic capacity are evaluated via Monte Carlo simulations.

关 键 词：Multiple-Input Multiple-Output （MIMO） Orthogonal Frequency Division Multiplexing（OFDM） Kronecker product Channel correlation Ergodic capacity 

分 类 号：TN92[电子电信—通信与信息系统]