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Re: [Discuss-gnuradio] OFDM
From: |
Johnathan Corgan |
Subject: |
Re: [Discuss-gnuradio] OFDM |
Date: |
Mon, 12 Feb 2007 15:27:47 -0800 |
User-agent: |
Thunderbird 1.5.0.9 (X11/20070103) |
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:
http://gnuradio.org/trac/browser/gnuradio/branches/developers/n4hy/ofdm2/gnuradio-examples/python/ofdm
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
http://corganenterprises.com