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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回答(2 个)
Honglei Chen
2018-8-29
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
2018-8-29
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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