《MIMO-OFDM无线通信技术及MATLAB实现》随书源码-第9章 MIMO信道容量.rar

%Ergodic_Capacity_Correlation.m % Capacity reduction due to correlation of the MIMO channels %MIMO-OFDM Wireless Communications with MATLAB㈢ Yong Soo Cho, Jaekwon Kim, Won Young Yang and Chung G. Kang %2010 John Wiley & Sons (Asia) Pte Ltd clear all; close all; SNR_dB=[0:5:20]; SNR_linear=10.^(SNR_dB/10); N_iter=1000; N_SNR=length(SNR_dB); %%----------------- 4x4 ----------------------------- nT=4; nR=4; n=min(nT,nR); I = eye(n); sq2=sqrt(0.5); R=[1 0.76*exp(0.17j*pi) 0.43*exp(0.35j*pi) 0.25*exp(0.53j*pi); 0.76*exp(-0.17j*pi) 1 0.76*exp(0.17j*pi) 0.43*exp(0.35j*pi); 0.43*exp(-0.35j*pi) 0.76*exp(-0.17j*pi) 1 0.76*exp(0.17j*pi); 0.25*exp(-0.53j*pi) 0.43*exp(-0.35j*pi) 0.76*exp(-0.17j*pi) 1 ]; C_44_iid=zeros(1,N_SNR); C_44_corr=zeros(1,N_SNR); for iter=1:N_iter H_iid = sq2*(randn(nR,nT)+j*randn(nR,nT)); H_corr = H_iid*R^(1/2); tmp1 = H_iid'*H_iid/nT; tmp2 = H_corr'*H_corr/nT; for i=1:N_SNR C_44_iid(i) = C_44_iid(i) + log2(det(I+SNR_linear(i)*tmp1)); C_44_corr(i) = C_44_corr(i) + log2(det(I+SNR_linear(i)*tmp2)); end end C_44_iid = real(C_44_iid)/N_iter; C_44_corr = real(C_44_corr)/N_iter; plot(SNR_dB,C_44_iid, SNR_dB,C_44_corr,':'); xlabel('SNR [dB]'); ylabel('bps/Hz'); set(gca,'fontsize',10) legend('iid 4x4 channels','correlated 4x4 channels'); title('信道相关信道容量') grid on;