function[x_pre] = precode(Mt,x_mod,V,N);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%--------------------------------------------------
%   預(yù)編碼，在用信道右矩陣過濾調(diào)制矢量事預(yù)編碼傳輸矢量
%   預(yù)編碼模塊在IFFT模塊之前
%   預(yù)編碼左乘信道已消除奇異值誘惑的右矩陣，分解信道
%--------------------------------------------------
%   Mt      發(fā)送天線
%   x_mod   每個(gè)頻率的調(diào)制信號(hào)
%   V       信道右矩陣
%   N       子載波數(shù)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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);