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[Discuss-gnuradio] Arbitrary symbol rate transmission by USRP2.

From: 加藤義也
Subject: [Discuss-gnuradio] Arbitrary symbol rate transmission by USRP2.
Date: Tue, 5 Jan 2010 00:29:27 +0900

Arbitrary symbol rate transmission by USRP2.

I would like to transmit dqpsk 1,536,000sps with using benchmark_tx.py and benchmark_rx.py thru USRP2.
Since USRP2 does have 100MHz as clock source.
With the clock, seems decimation and interpolation only allow me at 1,538,461sps(100MHz/65) is the nearest.

I thought I need to make the clock which familiar to the desired symbol rate(1,536,000sps).
Which I modify FPGA's DCM clock manager to prescale 100MHz by 3125 (100,000,000/3125=32KHz) and
 multiply it by 384(12.288Msps = 8x 1,536,000) and feed it to the DAC/ADC.
I feel decimation and interpolation number is too huge for DCM.

Would someone please advice me out where I should tackling to at first?
Should I still go for modify DCM clock manager?

Yoshiya Kato.

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