stbcg2_tx.m

该系统主要使用matlab实现了stbc2*1系统的发送和接收

function [Sv,rx,G,symb]=stbcG2_tx(snr,Hh,delay)
%This routine generates the received data but with Non-Gaussian Noise.
%H is TRUE channel matrix
%stbc is which stbc to use
%symb are the true symbols to be used for error rate later
%rx is the simulated received data
%G is the transmitted stbc matrix

%Note: set epsilon = 0 to obtain pure gaussian noise.

global nTx nRx Mary Smap epsilon kappa


%G2 : |  x1 -x2* |
%     |  x2  x1* |
%H=(randn(nRx,nTx) + i*randn(nRx,nTx))/sqrt(2);  %FOR RAYLEIGH TESTING !!!


rx = zeros(nRx,delay);

%Randomly pick symbol's index 
symb=ceil(rand(nTx,1)*Mary);
%Encode using PSK modulation
[Sv]=psk_gen(Mary,symb);

%Transmit Coding Matrix
G = [ Sv(1) -Sv(2)';
    Sv(2) Sv(1)'];
%Noise Stats
Eav=Smap'*Smap/Mary;
NP = 10*log10(Eav) - snr;  %NP only in dB (for PSK signal power is 0 dB) 
sigma2 = 10^(NP/10);
NF2 = sigma2 / ((1-epsilon) + (kappa*epsilon));

%Received Signal from Across Channel
for d = 1:delay
    u = rand(1);
    if u < epsilon
        noise = sqrt(kappa*nTx*NF2/2)*(randn(nRx,1) + i*randn(nRx,1));
    else
        noise = sqrt(nTx*NF2/2)*(randn(nRx,1) + i*randn(nRx,1));
    end
    
    rx(:,d) = Hh(:,:,d)*G(:,d) + noise;
end
return