qpsk_system_ber_simulation.m

QPSK环境下的仿真性能分析

% QPSK System Simulation, Pe evaluation
echo on
SNRindB1=0:2:6;
SNRindB2=0:0.1:6;
for i=1:length(SNRindB1),
    [pb,ps]=cm_sm32(SNRindB1(i));               % simulated bit and symbol error rates
    smld_bit_err_prb(i)=pb;
    smld_symbol_err_prb(i)=ps;
    disp([ps,pb]);
    echo off;
end;
echo on;
for i=1:length(SNRindB2),
    SNR=exp(SNRindB2(i)*log(10)/10);            % signal to noise ratio
    theo_err_prb(i)=0.5*erfc(sqrt(SNR));        % theoretical bit error rate
    echo off;
end;
echo on;
% Plotting commands follow
semilogy(SNRindB1,smld_bit_err_prb,'*');
hold
semilogy(SNRindB1,smld_symbol_err_prb,'o');
semilogy(SNRindB2,theo_err_prb);