Richard Clarke wrote:
Hi George,
I have had a Summer student doing some work on this (a year ago now).
He implemented a GNU Radio module that can do Rayleigh channel
simulation. He based it on a particular paper (I'd have to look it up)
for the implementation. He verified the statistical performance of his
implementation against the Matlab Rayleigh channel model and against
theory and found it to be a close match. I'm not entirely convinced of
the delayed multiple path aspects of the design/implementation but
haven't had time to look into it further. In fact as it stands I
believe the GNU Radio module (at C++ level) only handles a single flat
fading path and doing multiple delayed paths is done at the python
module level and which invokes multiple instances of the Flat fading
Rayleigh C++ GNU Radio module.
I'd welcome another set of eyes and someone more experienced than I am
with GNU Radio to help finish off this potentially very useful
addition to the GNU Radio code base.
Cheers
Richard
Richard,
That sounds great; please let us contribute it. We have a basic channel
model in Python that implements an AWGN channel, but has a filter, which
you can set the taps to do fading. It'd be nice if we could enhance this
to implement a Rayleigh, and even Rician channel (Nakagami, too, for
those of you who really care about this stuff).
Sounds like your student did some version of Jakes' model. At least,
that's where I'd start. I have this in Matlab from an old class project
that I was going to see about resurrecting, but it'd be great to have it
already implemented in GNU Radio.
Thanks!
Tom
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