can u help 4 BER performance in MIMO?I need matlab codes for this......

[sangeethamurugesan]

can u help 4 BER performance in MIMO?I need matlab codes for this.....
thanks in advance...............

 

[poomathi]

Below is the matlab code for alamouti model
%Transmitter part if syms_in is the symbols to the input of 2 Tx antenna
function syms_out = tx_Alamouti(syms_in)
num_symbols = length(syms_in);
ant1_syms = zeros(1,num_symbols);
ant2_syms = zeros(1,num_symbols);
syms_out = zeros(2,num_symbols);
% unchanged symbols
ant1_syms(1:2:num_symbols) = syms_in(1:2:num_symbols);
ant2_syms(1:2:num_symbols) = syms_in(2:2:num_symbols);
% transformed symbols
ant1_syms(2:2:num_symbols) = -conj(syms_in(2:2:num_symbols));
ant2_syms(2:2:num_symbols) = conj(syms_in(1:2:num_symbols));
syms_out(1, = ant1_syms;
syms_out(2, = ant2_syms;

%Receiver Alamouti with fading coefficints(csi) and received symbols as input
function syms_out = rx_Alamouti(syms_in,csi)

[nr n_syms] = size(syms_in);
decoupled_syms = zeros(1,n_syms);
combined_syms = zeros(1,n_syms);

% for spread
if n_syms~=(size(csi,2)*2)
ns = n_syms/(size(csi,2)*2);
m = size(csi,1);
h = reshape(repmat(csi,ns,1),m,[]);
else
h = csi;
end

% combine
for rx_ant = 1:nr
decoupled_syms,1:2:n_syms) = conj(h((rx_ant-1)*2+1,).*syms_in(rx_ant,1:2:n_syms) + h((rx_ant-1)*2+2,.*conj(syms_in(rx_ant,2:2:n_syms));
decoupled_syms,2:2:n_syms) = conj(h((rx_ant-1)*2+2,).*syms_in(rx_ant,1:2:n_syms) - h((rx_ant-1)*2+1,.*conj(syms_in(rx_ant,2:2:n_syms));
combined_syms = combined_syms + decoupled_syms;
end

syms_out = combined_syms/nr;

 

[sangeethamurugesan]

thanks alot..i ll check it out..if u ve simple matlab codes for SUCCESSIVE INTERFERENCE CANCELLATION IN MIMO..........PLS SEND IT 2 ME

 

[poomathi]

I don't have it

 

[shree4u]

send me the basic requirement , aither ur doing SNR vs BER perfromence, which modulation and encoding, so that i can frwd u

 

[sangeethamurugesan]

hi,Eb/N0 VS BER...modulation s BPSK... And channel assumption s rayleigh fading...after that have to work for Multiple feedback SIC.....