On 16/05/2011 1:03 PM, John Andrews wrote:
Shouldn't I use some kind of modulation scheme to do this, like FM or
AM, to transmit a tone?
No, you can just transmit a narrow, single-frequency tone, and use the
receivers FFT to determine how far off it is from
where you expect it.
use a signal-source producing a SIN wave at, let's say, 1KHz, feed that
into a UHD/USRPx sink tuned to whatever your frequency is.
The tone will appear at TUNED-FREQUENCY+1KHz.
On Mon, May 16, 2011 at 10:02 AM, Marcus D. Leech <[email protected]
<mailto:[email protected]>> wrote:
On 16/05/2011 10:26 AM, Alexander Chemeris wrote:
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.
Keep in mind that the offset measured must necessarily be the
total offset--that is, both Rx and Tx can be "off" in frequency.
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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