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Re: [Discuss-gnuradio] Softbits in gr-ieee 802.11 ?

From: sumit kumar
Subject: Re: [Discuss-gnuradio] Softbits in gr-ieee 802.11 ?
Date: Thu, 18 Jan 2018 14:41:42 +0100

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 <address@hidden> wrote:

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.



On 01/17/2018 11:36 AM, sumit kumar wrote:

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


Sumit Kumar

Attachment: GR IEEE 80211 OTA TESTS.xlsx
Description: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

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