[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
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 |
User-agent: |
Webmail Services/0.4 |
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
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
True, for a SISO system with TDD(not FDD) theres no problem for your
kind of application.
Regards
Agile Solutions
- [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application, Colby Boyer, 2011/04/19
- Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application, Matt Ettus, 2011/04/19
- Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application,
info <=
- Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application, Colby Boyer, 2011/04/19
- Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application, info, 2011/04/19
- Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application, Vijay Pillai, 2011/04/19
- Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application, Colby Boyer, 2011/04/19
- Re: [Discuss-gnuradio] Odd use of LO phase lock feature on USRP for RFID application, Matt Ettus, 2011/04/19