add_whitenoise2.m

来自「％ 仿真主要完成OFDM系统建模,实现OFDM系统传输流程, ％ 并对OFDM」· M 代码 · 共 15 行

% add_whitenoise.m

function [Rx_bits] = add_whitenoise(tx_bits,var);

Itx_bits = real(tx_bits);
Qtx_bits = imag(tx_bits);
%randn('state',sum(100*clock));
inoise=randn(1,length(tx_bits));
%randn('state',sum(100*clock));
qnoise=randn(1,length(tx_bits));
ipower=sum(inoise.*inoise)/length(tx_bits);
qpower=sum(qnoise.*qnoise)/length(tx_bits);
I_noise = var*(inoise-mean(inoise))/sqrt(ipower);
Q_noise = var*(qnoise-mean(qnoise))/sqrt(qpower);
Rx_bits = (Itx_bits+I_noise)+i*(Qtx_bits+Q_noise);