tu4_8.m

多输入多输出系统不同收发天线对系统性能的影响

snr=[0:2:20];
err_11=[0.145307692307692,0.105461538461538,0.075,0.053384615384615,0.034615384615385,0.022846153846154,0.014615384615385,0.009923076923077,0.006538461538462,0.004076923076923,0.002307692307692];
err_21=[0.227,0.149153846153846,0.085,0.045384615384615,0.022769230769231,0.010615384615385,0.005230769230769,0.002307692307692,0.001307692307692,0.000153846153846,0.000461538461538];
err_31=[0.205192307692308,0.119769230769231,0.067115384615385,0.030653846153846,0.011576923076923,0.004692307692308,0.000961538461538,0.000538461538462,0,0,0];
err_41=[0.198653846153846,0.115153846153846,0.054230769230769,0.021115384615385,0.008076923076923,0.002153846153846,0.000730769230769,0.000076923076923,0.000038461538462,0,0];
%为了满足同样的频谱效率，对全速率（为1）采用BPSK调制，而对速率为1/2的G3、G4发射矩阵采用多进制调制，即QPSK；
figure;
semilogy(snr,err_11','k-o',snr,err_21','b-*',snr,err_31','g-x',snr,err_41','r-.');
xlabel('SNR[dB]')
ylabel('BER')
axis([min(snr) max(snr) 1e-6 1e-0])
legend('uncode BPSK','2x1 BPSK','3x1 QPSK','4x1 QPSK')
title('平坦瑞利衰落信道，频谱效率1bit/s/Hz,帧长为130，100个数据块，不同发射天线时的误码率')