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Re: [Discuss-gnuradio] Support wideband(20MHz) OFDM transmitting/receivi

From: Qing Yang
Subject: Re: [Discuss-gnuradio] Support wideband(20MHz) OFDM transmitting/receiving using RawOFMD and USRP N210
Date: Wed, 8 Aug 2012 23:15:21 +0800

Hi Alex,

I run benchmark_ofdm on my equipments. It can support 20MHz transmitting and receiving. I run the commands

~/grforwarder_ylz/gr-uhd/apps$ ./benchmark_tx.py -f 2.485G  -W 20M
~/grforwarder_ylz/gr-uhd/apps$ ./benchmark_rx.py -f 2.485G -W 20M

the receiver works well.

However, when I use the uhd_fft.py to see the signal spectrum, the bandwidth of the benchmark_tx's signal is only 8MHz. I guess the benchmark_tx does not use 20MHz to transmit.

Yang, Qing
Information Engineering, CUHK

2012/8/8 Alex Zhang <address@hidden>
Could I know your current achieved bandwidth of OFDM communication over GNURadio on your platform?

On Tue, Aug 7, 2012 at 9:55 AM, <address@hidden> wrote:

On 07 Aug 2012 10:49, Nathan West wrote:

Agreed, which is why there is general advice, like enabling real-time scheduling for non-root users: http://lists.gnu.org/archive/html/discuss-gnuradio/2010-07/msg00463.html

You should also run volk_profile : http://gnuradio.org/redmine/projects/gnuradio/wiki/Volk

And if you think the link between the USRP and your PC is an issue you shouldn't use any kind of hub/switch.


I've found that if you're consistently running out of steam, enabling real-time scheduling doesn't help.




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