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Re: [Discuss-gnuradio] GSoC2014 Turbo Equalizer

From: Anh Duc Nguyen
Subject: Re: [Discuss-gnuradio] GSoC2014 Turbo Equalizer
Date: Fri, 28 Feb 2014 22:57:59 +0700

Dear Jan Krämer,

I am very interested in your proposal. However, to my best of knowledge, turbo equalizer (TB) is pretty complicated and  computationally heavy, then it is challenging to have an effective real-time implementation of TB. I would like to have some questions as follows:

1. Your ISI channels' characteristics: fixed/ known beforehand or time-variant, how dispersive they are 
2. which techniques do you wish to use for equalizer part: MMSE, MAP, or MLSE?
3. coding: as you presented above - it may be a convolutional or turbo code, and others?
4. Some special hardware platform may require
5. why do you select 2. and 3. to have the best performance in terms of complexity or quality, and that combination is realistic to be real-time implemented in GnuRadio plus 4.

To be honest, I have desperately struggled these question for quite a long time, then you and some others can help work together to find the answers,

Best regards,
Nguyen Anh Duc

On Tue, Feb 25, 2014 at 8:59 PM, Jan Krämer <address@hidden> wrote:
Hi everyone,

I am a student at Communications Engineering Lab (CEL) at Karlsruhe Institute of Technology. I major in "communication systems" and I am currently doing my masterthesis on "Parallel log-map decoders for manycore architectures". I am interested in participating in GSoC 2014.

There is an older GNURadio GSoC proposal from 2013 to implement a turbo equalizer module in GNURadio in which i am particularly interested working on, as it is closely connected to my current field of study.
So i would like to share my thoughts on a possible Update of the old turbo equalizer proposal (and maybe upgrading it to a current proposal ?).

Turbo Equalizer

A Turbo Equalizer is a receiver component that is highly effective when receiving messages corrupted by Intersymbol Interference (ISI). To archive this, the turbo equalizer uses an Equalizer to eliminate the ISI and a Log-Map Decoder for Forward Error Correction. Both components pass soft information to each other to increase the performance.


Possible (sub-)projects:
1. Implement the Log-Map decoder
    - preferably it can be fully configurable (constraint length, number of states, trellis structure)
    - preferably optimized for real time applications
2. Implement the linear equalizer
    - preferably optimized for real time applications                 

Knowledge of digital signal processing, C/C++, Python

Potential mentor(s)
Sebastian Koslowski, Michael Schwall


That would be a project I think would be really interesting to work on and i think it fits well with some of the other proposals for new GNU Radio Modules. As the turbo eq itself is a highly complex architecture, it could also be beneficial to split the tasks in this project. It would be great to get some feedback from you, if this was a proposal that would benefit GNURadio and if it has the potential to be included in the GSoC list of ideas.     

Thanks and regards,
Jan Krämer

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