?? precode.m
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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 - # subchannelsx_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))];endx_pre = transpose(x_pre);
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