Johnathan Corgan wrote:
[EMAIL PROTECTED] 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
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.
Tom
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