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Re: [Discuss-gnuradio] OFDM

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] OFDM
Date: Mon, 12 Feb 2007 18:19:50 -0500
User-agent: Thunderbird (X11/20061206)

Johnathan Corgan wrote:
address@hidden wrote:

I'm pretty new to gnu radio and I want to transmit an OFDM signal
using different modulation types (BPSK, QPSK, and 64-QAM).  The
concept is pretty simple: read data, map it to a specified
constellation map, and then send it through an IFFT.  I don't know if
this code already exists but I could use some help.

There is work underway in this area to create a parameterized OFDM
modulator/demodulator pair, but it is incomplete and not yet merged into
the trunk.  You can see the code in:


These examples depend on C++ elsewhere in the tree in this developer
branch so they won't run as-is. You can, however, see how the transmit
path is put together.

By the way, you're right--the modulator is the easy part.  It's the
receiver synchronization that always turns out to be the black magic
part. (Why is this always glossed over? :-)

Johnathan Corgan
Corgan Enterprises LLC

As Johnathan said, we've pretty much got the modulator and demodulator done. A few of us will be working next week on pulling it all together and finishing the synchronization. With any luck and the alignment of the Zodiac (or whatever astrological/mythological concept you want to wish on), we'll get this merged into the trunk by the end of next week.

From there, hack away and make improvements.


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