Hi everyone,

I am using USRP + RFX2400 + SUSI.

I have problem with the frequency synchronization of two USRP nodes,

when

one is transmitter and the other one is slave. The way I am handling

this

problem at the moment is as follows…I always first use

fftsink.fft_sink_c() with usrp’s decimation = MAX i.e. 256, then I

manually

calculate how much deviation is there from the center and then I

add/subtract that factor from my actual receiver which actually I want

to

use for receiving data.

But the problem is every time I need to do this manual calculation. Now

I am

thinking to implement a routine which will always run (whenever freq.

synchronization would be required) and will find the peak (may be the

same

peak shown by fftsink) and will calculate the center frequency where the

peak is found…??? But this is just my theoretical idea, I dont know

how

can I do it…Can some one please tell me how I can implement such

frequency

sychronizer(or may be you can say I want to implement PLL). How can I

detect

the peak? and How I can find the frequency of that peak?

Best Regards

Kaleem Ahmad

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