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

From: Alex Zhang
Subject: Re: [Discuss-gnuradio] Support wideband(20MHz) OFDM transmitting/receiving using RawOFMD and USRP N210
Date: Mon, 6 Aug 2012 16:59:27 -0500

Just state, I was using the tunnel.py instead of the rawOFDM to do the test. Seems nobody declared good bitrate within this community, although I have asked for many times.

On Mon, Aug 6, 2012 at 3:06 PM, Alex Zhang <address@hidden> wrote:
Hi Qing,

Your experience is exactly what I have tested. The data rate of OFDM based on the current GNURadio never exceeds 1Mbps with acceptable PER.
I guess the only way to beat more bandwidth is to use very strong computer...

On Mon, Aug 6, 2012 at 10:12 AM, Qing Yang <address@hidden> wrote:
Dear all,

Recently we are building an OFDM communication system based on RawOFDM(http://people.csail.mit.edu/szym/rawofdm/README.html). In the simplest point-to-point case, we use a pair of PC and USRP as the transmitter and use another pair as the receiver. 

To reduce the influence of CFO, we need to run our system with large bandwidth (like 802.11 at 20MHz). However, once we set the transmitting bandwidth larger than 2MHz, the receiver's program will block there and show "over-run" message later on (a screen of "O"s). For small bandwidth (<2MHz), the receiver runs pretty well.

Do you have similar experience? How can I make the OFDM receiver work with 20MHz bandwidth?

We use USRP N210. And the configuration of our PC is
Ubuntu release 10.10(maverick) kernel 2.6.35-22-generic GNOME 2.32.0
Memory: 15.7GiB
Processor 0~7: Intel(R) Xeon(R) CPU E5620 @ 2.40GHz

UHD version: UHD_003.004.000-c50bb91 image version 8
gnuradio version: 3.4.x

Yang, Qing
Information Engineering, CUHK

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