precode.m

关于在ofdm_MIMO无线通信系统下的Rayleigh仿真程序

function [x_pre] = precode(Mt, x_mod, V, N);
% [x_pre] = precode(Mt, x_mod, V, N);
%
% Function precodes the modulated symbols prior to sending through the IFFT module.  The precoder
% left-multiplies the channel at each tone, to eliminate the right unitary matrix in the SVD
% decomposition of the channel.
%
%   Mt - # transmit antennas
%   x_mod - modulated symbols for each tone (the symbols are grouped together in tones, ie: for 3
%           MIMO subchannels per tone, have 3 consecutive x_mod symbols)
%   V - the matrix of right unitary matrices of the channel, in row order
%   N - # subchannels

x_pre =[];
for i = 1:N
    x_pre = [x_pre; [V(:,(i-1)*Mt+1:i*Mt)]*transpose(x_mod((i-1)*Mt+1:i*Mt))];
end

x_pre = transpose(x_pre);