MIMO system Matlab help

medototy said:

hi, in my matlab code stream of data, I'll do it in program like this steps:
N=??; % length of each frame
L=??; % total number of frames
for i=1:L
y=H*s,(i-1)*N+1:i*N)+W;
-------
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end
In above steps I suppose the system deal with all data as one stream, now I want to divide the data in to 4 parts (4 sub-streams) to use it in the same above steps, is there any one can help me please at once.
THANKS

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b=randn(L,N)>0.5;%This is the 0 1 streams
d=2.*b-1;%This is the corresponding -1 +1 streams

medototy said:

Thanks David83 for your comment, but I need steps like this:

Code:

    Nt = 4;      
    Nr = 4;
    EbNo = 0:3:25;                 % SNR dB
    N = 5;                             % The length of each frame 
    L = 100;                           % the total number of frames
    M = 16;                            % MQAM Modulation
    x = randi(M,Nt,N*L)-1;        % Generate Signal source
    sm = qammod(x,M,0);            % M-QAM Modulation
    s = 1/sqrt(Nt)*sm*1/sqrt(10);
    Const_size = sqrt(M);
    Constellationform = -(Const_size-1):2:Const_size-1;
    Constellation = 1/sqrt(Nt)*Constellationform*1/sqrt(10);
    for index1 = 1:length(EbNo)
     x2 = [];
     for  index2 = 1:L        % Assume that the channel remains unchanged in every frame
            H_complex = (randn(Nr,Nt)+1j*randn(Nr,Nt))./sqrt(2);    % Flat Rayleigh fading channel
            sigma(index1) = sqrt(1/(10.^(EbNo(index1)/10)));   % the MSE(mean square error) of Noise, SNR=1/(sigma)^2 
            w_complex = sigma(index1)*(randn(Nr,N)+1j*randn(Nr,N))./sqrt(2); 
            y_complex = H_complex*s(:,(index2-1)*N+1:index2*N)+w_complex;      % The received signal   Y=HX+W
            H = [[real(H_complex) -imag(H_complex)]; [imag(H_complex) real(H_complex)]];  % turn into real-valued 
            y = [real(y_complex); imag(y_complex)];  
            w = [real(w_complex); imag(w_complex)];

Please can you help me to modify the above steps to get the same work but by divide the original data in to 4 sub-streams.
THANKS

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