What stage to add noise in FMCW radar system?

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Aimee Nogoy
Aimee Nogoy 2018-8-26
评论： Aimee Nogoy 2018-8-30
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
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
Naman Chaturvedi
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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Aimee Nogoy
Aimee Nogoy 2018-8-30
Hi Naman,
Thank you! Also, I forgot to mention I have an RX antenna array that involves the collector step. In this case, does the collector receive the corrupted signal or is it still done by the receiver preamp?

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