add_noise.m

ofdm_EM_channel OFDM信道估计源代码

function rec_freq_Signal=add_noise(rec_freq_Signal_ideal,snr_indB,Eav);
snr = 10^(snr_indB/10);   
  N0 = Eav/snr;
  sigma0 = sqrt (N0/2);    %加入双边带功率谱
noise =  sigma0 * complex( randn(size(rec_freq_Signal_ideal)), randn(size(rec_freq_Signal_ideal)));
rec_freq_Signal=rec_freq_Signal_ideal+noise;