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Re: [Discuss-gnuradio] USRP Tx Rate Conversion

From: Brian Padalino
Subject: Re: [Discuss-gnuradio] USRP Tx Rate Conversion
Date: Mon, 14 Apr 2008 20:55:51 -0400

On Mon, Apr 14, 2008 at 8:03 PM, Wireless Monster
<address@hidden> wrote:
> Hi All,
> I am new to gnuradio and the USRP board and I have a basic question.
> I want to transmit a GSM signal. Once It is encoded I have a  270833.333
> symbols/sec signal. Then, it is up-converted (x8) and GMSK filtered, so I
> get a 2.1666 Ms/s complex signal.
> Now the question: How to adapt this rate to the DAC converter on the USRP
> board?

Well, if you don't use your x8 upconversion, you can get away with a
rational resampling (I believe).

Taking 270833.333, and upconverting by 3x makes the sample rate
812500.  If you then rationally resample this by 16/13, you get a nice
1Msps signal which you can upconvert by a nice power of 2 for the

Try it out and let us know how it works out?


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