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Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID

From: info
Subject: Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application
Date: Tue, 19 Apr 2011 19:44:29 +0000
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On Tue, 19 Apr 2011 11:41:46 -0700, Matt Ettus <address@hidden> wrote:
> On 04/19/2011 11:38 AM, Colby Boyer wrote:
>> Hi All,
>> In RFID applications, a reader receives (backscatter from RFID tag) and
>> transmits (constant tone) at the same frequency. With commercial
>> readers, a single LO will be shared by the RX and TX chain. However, in
>> the USRP case, two separate daughter boards are used so different LOs
>> are in use for the RX and TX chain. So you should end up with some
>> frequency offset in RX chain due to mismatched clocks.
>> Is it possible to lock the LOs of a TX daughter board and a RX daughter
>> board, as you would for a traditional MIMO 2 TX or 2 RX setup? There
>> appears to numerous discussions and examples of the latter. I'm thinking
>> it would be possible. But I'm more of a systems guy and less of a RF
>> hardware guy, so any comments would be appreciated.
>> Thanks,
>> Colby
> As long as you set them to the same frequency, they're already locked.
> No need to do anything different.
> Matt
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True, for a SISO system with TDD(not FDD) theres no problem for your
kind of application.
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