[time-nuts] power spectrum of hard limiter output

jimlux jimlux at earthlink.net
Tue Jan 25 13:56:19 UTC 2011

On 1/24/11 1:41 PM, Bob Camp wrote:
> Hi
> Most communications systems also have constraints based on signals in
> adjacent channels. That pretty much forces a solution of "lots of filter
> before lots of gain". Distributing both gain and filtering across multiple
> stages gets you into a variety of issues that map junk into the passband.
> Once the junk is there, you can't get rid of it later.

And GPS (and other CDMA systems in general)  is an example of a system 
where it's different.The "capture effect" of limiters is well known, and 
it's fascinating that the system actually works worse if the SNR is too 
high, because you need the noise to be able to receive ALL the signals 
at once.

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