BPSK Demodulation

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how do I apply negative frequency to my nco? do you mean in regard to its sin & cos output?

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If you are using the nco model then just swap sin/cos (or use negative tuning word if supported)

Alternatively you can use the following line:

nco = exp(j*2*pi*i*freq);

inside your loop

set freq to any value +/- 0 ~ 0.5 and I suggest using -0.1, -0.11,-0.09 (not -1.1 that was typing error)

you rf input can be just:

rf = cos(2*pi*(0:N-1)*.1); fixed for all three tests