Tom, in your email exchange with Richard Clarke on 29 Jan 2008, as shown below,
it was mentioned that a multi-path channel model might be integrated into GNU
Radio library.
I am wondering whether this has happened or not? If not, do you still have
code written by Richard's student? If so, would you suggest ways that I can get
a copy of the code.
The FTP that Richard set up is not accessible now.
Thanks,
Andrew
Tue, 29 Jan 2008 23:20:24 +0000
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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