awgnchannal.m

qpsk调制的MATLAB实现

% Intialization
OSF=4;
SNR_dB=10;
%change format
trans_i=transmit_i/127*0.707;
trans_q=transmit_q/127*0.707;
tx=trans_i+trans_q*j;
% AWGN Channel
rx=awgn(tx,SNR_dB-10*log10(OSF),'measured');
rx_i=round(real(rx));
rx_q=round(imag(rx));