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Re: [Discuss-gnuradio] Broadband Applications with USRP

From: Ron Economos
Subject: Re: [Discuss-gnuradio] Broadband Applications with USRP
Date: Thu, 04 Dec 2014 23:41:47 -0800
User-agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

You can try my DVB-S2 modulator to do some transmit benchmarking.


With the test flow graph, to send a 30 MHz wide signal (which is actually
typical for real DVB-S2 uplinks), you'll need to set the symbol rate to
30 / 1.2 or 25 Msymbols/sec. Since the modulator uses 2X oversampling,
the sample rate will be 50 Msps.

You'll need an SDR that can operate at that sample rate with an
interface that can keep up. A B2x0 could work if you have a good
USB3.0 controller.

The CPU bottleneck on the DVB-S2 flow is the FEC (both LDPC and BCH)
generation. The net bit-rate at 25 Msyms/s with the test flow graph
will be 87 Mbps.

In general, receive is usually much worse CPU wise. Again, the FEC can
take an enormous amount of CPU cycles.

best regards,

On 12/04/2014 01:44 PM, Lefteris Kampianakis wrote:
Hello Everyone,

I am interested in developing broadband applications (~30MHZ BW) using the USRP and I have some questions:

0) What is the largest bandwidth I can process using a flow graph with relatively large complexity (e.g. 16QAM demodulator simple lowpass, 2 x mixers), any USRP and a computer with arbitrarily large processing power. I just want a rule of thumb approximation.

1) I know it's probably not the right place to ask, but do you think my application can be implemented in either Labview, or MATLAB USRP interfaces?

2) If it is not possible at all, do you think Nutaq, PicoSDR is the right hardware, considering that it has modules implemented on the FPGA?

3) Are there any papers/applications notes etc in the literature that you are aware of that implement broadband (30 MHZ BW) systems using the USRP?

 Thank you
Eleftherios(Lefteris) Kampianakis
Electronics and Computer Engineer
PHD Candidate and Researcher at Sensing Computing Communications Group (SGCC)
Department of Electrical Engineering
University of Washington
3927 Adams Lane, NE, Mercer Court D805B, 98105

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