multi_path channel.m

OFDM系统的仿真代码MATLAB环境下

% Two_path Rayleigh Channel
function [b1, b2] = maltipath_channel

global sim_consts;

N = 1000;

% The IIR filter is described by the vectors A and B 
A = [1 -2*p p^2];
B = (1-p)^2;

if ~isempty(findstr(sim_consts.ChannelMode, 'Slow-variable'))  % Slow-variable channel
   p = 0.99;
   for i = 1:N
      [white_noise_seq1(i), white_noise_seq2(i)] = gngauss;
   end;
   b1=filter(B,A,white_noise_seq1);
   b2=filter(B,A,white_noise_seq2);
  
elseif ~isempty(findstr(sim_consts.ChannelMode, 'Fast-variable')) % Fast-variable channel
   p = 0.9;
   for i = 1:N
      [white_noise_seq1(i),white_noise_seq2(i)] = gngauss;
   end;
   b1 = filter(B,A,white_noise_seq1);
   b2 = filter(B,A,white_noise_seq2);
end