gain.m

alamouti 空频分组码---在时变信道下SFBC-OFDM

% Gain in SNR
clear;

d = 1;
M = 12;
N = 128;
fs = 800000;

for i = 1:10;
    fm(i) = i*100;
    a0000(i) = Correlation(0, 0, 0, 0, d, M, N, fm(i), fs);
    a1010(i) = Correlation(1, 0, 1, 0, d, M, N, fm(i), fs);
    G1(i) = -10*log10( a0000(i).*(1-a0000(i)-a1010(i))./(a0000(i)+a1010(i))./(1-a0000(i)) );
    G2(i) = -10*log10( a0000(i)./(a0000(i)+a1010(i)) );
    %new(i) = 10*log10((a0000(i)+a1010(i))./(1-a0000(i)-a1010(i)));
    %old(i) = 10*log10( a0000(i)./(1-a0000(i)));
end

plot(fm, real(G1), 'b', fm, real(G2), 'r-' );
xlabel('fm');ylabel('Gain (dB)');
legend('Upper bound of Gain', 'Lower bound of Gain');
title('The Gain of SNR');
%plot(fm, old,'b',fm,new,'r');