creat_channel.m

汪裕民的OFDM关键技术与应用中仿真MIMO-OFDM的源代码

function[H,H_f] = creat_channel(Mt,Mr,A,N);
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% A   功率时延谱矢量
% Mt  发送天线数
% Mr  接收天线数
% N   在一个OFDM符号发送天线端的矢量符号数
% 频率选择性瑞利信道，假设复高斯过程在相位和幅度上是独立的
% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% 定义信道
H_int = 1/sqrt(2)*(randn(Mr*length(A),Mt)+j*randn(Mr*length(A),Mt));

H_int2 = [];
for i = 1:length(A)
    H_int2 = [H_int2;sqrt(A(i))*H_int((i-1)*Mr+1:i*Mr,:)];
end

H_int2 = [H_int2;zeros((N-length(A))*Mr,Mt)];

H_f =zeros(Mr,Mt*(N-16));
for i =1:Mt
    for jj = 1:Mr
        h_f = fft(H_int2(jj:Mr:(N-16-1)*Mr+jj,i));
        for k = 1:(N-16)
            H_f(jj,i+(k-1)*Mt) = h_f(k);
        end
    end
end
H = [H_int2];
for i = 1:N-1
    H = [H,[zeros(Mr*i,Mt);H_int2(1:(N-i)*Mr,:)]];
end