Re: [Discuss-gnuradio] Fwd: HW impairments

[Martin Braun]

On 02/22/2017 03:29 PM, Steve Joseph wrote:
> Hi,
> 
> I'm trying to understand the HW impairments python block better. I
> looked at the py source, and came up with the attached drawing of the
> functionality. 
> 
> Can you help me understand what the frequency offset is trying to
> emulate?  My guess is that one would set this offset = IF freq in a
> superheterodyne, or carrier freq in a direct conversion.  Is that
> correct?  My initial thought was that it was actually going to shift the
> signal by 'freq offset' Hz or rad/sample.  This doesn't appear to be the
> case though.

Yeah, that's what it does. See here:

https://github.com/gnuradio/gnuradio/blob/588fe5e999f57d6b9e9a4f3c1371f4eee36494a3/gr-channels/python/channels/impairments.py#L53

Not sure about your other one without reading some code though... and
it's too late for my poor brain now.

-- M

> Also, can you help me understand how phase noise magnitude is set? If I
> add phase noise to an amplitude 1 tone, and I want -60dBc/Hz @ 10kHz,
> how do I determine phase noise magnitude?
> 
> Any help is appreciated!
> 
> Thanks,
> Steve
> 
> 
> 
> 
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