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Re: [Discuss-gnuradio] direct conversion compensation
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] direct conversion compensation |
Date: |
Mon, 10 Dec 2007 09:40:50 -0800 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
On Sun, Dec 09, 2007 at 07:47:37PM -0800, Peter Monta wrote:
> > [ I/Q compensation ]
>
> There's some discussion in Razavi's "RF Microelectronics", section 5.2.2,
> and Kenington's "Software Defined Radio", section 5.3.1.1. The distinction
> you mention between DC and AC might come from this LO self-mixing
> business, a nonlinear effect, and indeed only at DC since it involves
> the LO mixing with itself at some random amplitude and phase. AC
> coupling would eliminate this artifact, but it would do nothing for the
> linear I/Q mismatch errors.
>
> Maybe future versions of the dbsrx could have I/Q compensation parameters
> in the EEPROM. Or is something there already?
>
> Cheers,
> Peter
It's on the list of things to do. Nobody's gotten to it yet.
It sounds like you may be the person we've been looking for ;)
There is room in the daughterboard EEPROM for storing the parameters.
We can work out a specific location when you're ready.
If you've got the time and inclination, please have a go at the I/Q
compensation. It would be great to have. Please post any questions,
etc.
Eric
- [Discuss-gnuradio] USRP 2.0, Teun, 2007/12/03
- Re: [Discuss-gnuradio] USRP 2.0, ceriel, 2007/12/06
- [Discuss-gnuradio] direct conversion compensation, Clark Pope, 2007/12/06
- Re: [Discuss-gnuradio] direct conversion compensation, Firas A., 2007/12/09
- Re: [Discuss-gnuradio] direct conversion compensation, Peter Monta, 2007/12/09
- RE: [Discuss-gnuradio] direct conversion compensation, Clark Pope, 2007/12/09
- Re: [Discuss-gnuradio] direct conversion compensation, Peter Monta, 2007/12/09
- Re: [Discuss-gnuradio] direct conversion compensation, Peter Monta, 2007/12/09
- Re: [Discuss-gnuradio] direct conversion compensation,
Eric Blossom <=