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.
Bob
Tom Rondeau wrote:
Shravan,
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
(609)-924-4600
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