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Hello, I've been working on an FSK non-coherent demodulation using a
quadrature receiver. I was actually getting some ambiguous results maybe you guys can check it out. Anyway, here's my code %%%%%%%%%%%%%%%%%%%%%% demodulation %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% N = 100; % number of samples %% correlation process %% % at higher freq. 3000 Hz u1 = cos(2*pi*(3000)*t); v1 = sin(2*pi*(3000)*t); % at lower freq. 2000 Hz u2 = cos(2*pi*(2000)*t); v2 = sin(2*pi*(2000)*t); for i=1:N, r(i)=filt(i); echo off; end; r1c(1)=r(1)*u1(1); r1s(1)=r(1)*v1(1); r2c(1)=r(1)*u2(1); r2s(1)=r(1)*v2(1); % sum from 0 to N for k=2:N, r1c(k)=r1c(k-1)+r(k)*u1(k); r1s(k)=r1s(k-1)+r(k)*v1(k); r2c(k)=r2c(k-1)+r(k)*u2(k); r2s(k)=r2s(k-1)+r(k)*v2(k); echo off; end; %% squaring and decision%%for k=1:N, r1(k)=r1c(k)^2+r1s(k)^2; r2(k)=r2c(k)^2+r2s(k)^2; z(k)=r1(k)-r2(k); if (z(k)<=0) desi(k)=0; else desi(k)=1; end; echo off; end; Louis Angeles BS Electrical Engineering George Mason University |
non-coherent FSK demodulation using quadrature receivers
Started by ●April 14, 2003
