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From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] USRP2 and Data Rate |
Date: | Wed, 07 Jul 2010 09:41:39 -0700 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-2.fc12 Thunderbird/3.0.4 |
On 07/07/2010 08:32 AM, Garrett Wenger wrote:
Hi all, A few days ago I made a simple program using grc to fsk modulate and transmit a pn sequence at 10kbps. Since I was using a USRP1, I set my samples per symbol to 25 and the interpolation to 512 to get this data rate. The place I work at just received a couple USRP2's, so I am trying to get this same program working with the new devices. I realize that the DAC rate for the USRP2 is 100 MS/s instead of 128 MS/s, so I changed the samples per symbol and interpolation rate to 25 and 400, respectively, but this does not give me the 10kbps rate like I expected it would. Is there something major that I am missing here?
Your calculations appear correct, so I'm not sure why you aren't seeing 10kbs. What rate does it give you?
Also, 25 samples per symbol is a lot. You would probably be better off doing an additional software decimate/interpolate by 5 operation (using an interpolating/decimating FIR filter) and using 5 samples per symbol.
Matt
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