I'm not sure if I understand you correctly, but you have to
differentiate what performance you mean. IT++ might have better decoding
performance (since it's using soft-bits), but the SIMD implementation
has better computational performance (i.e., needs less CPU).
To be honest, I didn't do a lot of testing between IT++ and the current
version. (I think I've seen a paper that compared soft-bits vs.
hard-bits and there was a 2-3dB improvement, but you have to check).
Since the decoder was a CPU bottleneck, I was more than happy to merge
the SIMD implementation, which was developed by Gonzalo Arcos based on
the gr-dtv decoder. See here
http://www.ccs-labs.org/bib/arcos2016accelerating/
Best,
Bastian
On 1/18/2018 13:41, sumit kumar wrote:
Thanks for confirming. I believe that IT++ version will work with
corresponding GNU Radio version.
Also what do you think (since you have developed the code for long time
:) ) : IT++ version will be as efficient as the current one? I mean the
current version uses SIMD for Viterbi.
I have tested the current version for success rate. I can share the
results(attached). Success rate mentioned is nothing but ratio of
received to transmitted frame per second using a R&H VSG. The test was
done over the air.
On 18 January 2018 at 13:06, Bastian Bloessl <[email protected]
<mailto:[email protected]>> wrote:
Hi,
you are right. The current implementation does not use soft-bits but
feeds hard bits into the decoder.
In 2013, I used the soft-input Viterbi decoder from the IT++ library.
http://itpp.sourceforge.net/4.3.1/convcode.html
<http://itpp.sourceforge.net/4.3.1/convcode.html>
Best,
Bastian
On 01/17/2018 11:36 AM, sumit kumar wrote:
Hi,
I am doing some proof of concept using gr-ieee 802.11.
The paper by author [1] says that it uses softbits, however in
the method
*constellation::decision_maker(const gr_complex *sample)*, I see
outputs as hardbits.
Am I missing something here i.e. any particular commit or branch
where the softbits implementation is there.
Its very important for my algorithm to use softbits :-/
[1]
https://conferences.sigcomm.org/sigcomm/2013/papers/srif/p9.pdf
<https://conferences.sigcomm.org/sigcomm/2013/papers/srif/p9.pdf>
Sumit
--
Sumit Kumar
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