What stage to add noise in FMCW radar system?
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I want to add AWGN to a FMCW signal to observe how different SNR levels affect system performance (like range/velocity/DOA estimation). Do I add it directly to receiver end like:
% Let sig be the signal reflected from a target
sig2 = receiver(sig) + noise % where receiver is the RX preamp object in the phased array toolbox
or do I add noise like this:
sig = sig + noise;
sig2 = receiver(sig);
I've tried both setups and I get different results, so I'm not sure what is correct.
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Honglei Chen
le 29 Août 2018
The line
sig2=receiver(sig)
already adds noise to the signal and the noise power is determined by the parameters in receiver. So both options you listed will add additional noise to the signal.
HTH
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Naman Chaturvedi
le 29 Août 2018
Hi Aimee,
The receiver receives the signal corrupted by noise and performs the estimation on the corrupted signal itself. So, the second way is the correct way to add the noise.
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