不同编码的二元相移电控的相干解调Matlab代码.rar

% coherent demodulation of differentially encoded binary phase shift keying (DBPSK) clear close all clc; N = 10^6; rand('state',100); randn('state',200); ip = rand(1,N)>0.5; ipD = mod(filter(1,[1 -1],ip),2); s = 2*ipD-1; n = 1/sqrt(2)*[randn(1,N) + 1i*randn(1,N)]; Eb_N0_dB = [-3:10]; for ii = 1:length(Eb_N0_dB) y = s + 10^(-Eb_N0_dB(ii)/20)*n; ipDHat_coh = real(y) > 0; ipHat_coh = mod(filter([1 -1],1,ipDHat_coh),2); nErr_dbpsk_coh(ii) = size(find([ip - ipHat_coh]),2); end simBer_dbpsk_coh = nErr_dbpsk_coh/N; theoryBer_dbpsk_coh = erfc(sqrt(10.^(Eb_N0_dB/10))).*(1 - 0.5*erfc(sqrt(10.^(Eb_N0_dB/10)))); close all figure semilogy(Eb_N0_dB,theoryBer_dbpsk_coh,'b.-'); hold on semilogy(Eb_N0_dB,simBer_dbpsk_coh,'mx-'); axis([-2 10 10^-6 0.5]) grid on legend('theory', 'simulation'); xlabel('Eb/No, dB') ylabel('Bit Error Rate') title('Bit error probability curve for coherent demodulation of DBPSK')