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Re: [Discuss-gnuradio] Re: Regarding OFDM implementation

From: Bob McGwier
Subject: Re: [Discuss-gnuradio] Re: Regarding OFDM implementation
Date: Mon, 16 Jul 2007 11:23:54 -0400
User-agent: Thunderbird 1.5 (X11/20051201)

The LTS at U. Md. has implemented (in GnuRadio) general QAM constellation mapping for modulate and demodulate. This was done by interns working for Charles Clancy. I will work with them to add the slicer and then check that stuff in but it might be the first of September before I can do this because of the workload this summer.


Tom Rondeau wrote:

I copied this to the listserv as I hope others find the discussion useful.

Shravan Rayanchu wrote:
Hi Tom,

I have a few questions regarding the OFDM implementation in gnuradio
(I am a networking guy and I have a little knowledge of DSP, so some
of my questions might be trivial):

1. Can you point me to the version with 16-QAM (or 64-QAM) running
over OFDM on the air?
The code is checked in, but I can't guarantee that it will work (especially the receiver). We have currently separated the modulators into gr_ofdm_<mod>_mapper; there's one for QAM, which was meant to be a generalized QAM modulator, but we just hard-coded 16QAM for now.

Eventually, these will go away into a single gr_ofdm_mapper function that takes a constellation vector as an argument, allowing any type of modulation per subcarrier.

Robert W. McGwier, Ph.D.
Center for Communications Research
805 Bunn Drive
Princeton, NJ 08540
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