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| From: | Marcus D. Leech |
| Subject: | Re: [Discuss-gnuradio] How can we measure the frequency offsets between two USRPs? |
| Date: | Mon, 16 May 2011 11:02:30 -0400 |
| User-agent: | Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10 |
On 16/05/2011 10:26 AM, Alexander Chemeris wrote:
Keep in mind that the offset measured must necessarily be the total offset--that is, both Rx and Tx can be "off" in frequency.You may also look into this code: http://thre.at/kalibrate/ It estimates offset of an USRP with regards to a GSM base station, but it can be easily modified to measure offset from any clean tone, e.g. transmitted by a second USRP.
The practical consequence should be NIL, because frequency correction should normally only be done on the Rx-side, and it should simply adapt to whatever it sees, regardless of the Tx and Rx components of the offset.
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