Nice work, looking forward to seeing what you produce. On Sat, Jul 18, 2015 at 2:34 AM, Johannes Demel <[email protected]> wrote:
> Hey GNU Radio'ers! > > another week has passed. So it's time for a project update. > This week was dedicated to channel construction. Finally, all channel > construction algorithms work. I added a couple of convenience > functions too. > First, there's a command line tool 'polar_channel_construction' which > will do channel construction according to the parameters you'll pass > to it. > Secondly, there's a GRC block which takes all the parameters and > returns a dictionary with the desired parameters. Most importantly, > <variable_name>['positions'] and <variable_name>['values'] contain the > Numpy arrays of interest. I hope they're self-explanatory. > For all channels but BEC, channel construction is quite a > computationally heavy task. Thus, Z-parameters which are generated > once for a user are saved in '~/.gnuradio/polar'. Afterwards they are > available. If a new set of parameters is encountered, the > corresponding z-parameters will be calculated automatically. There's a > progress bar and everything. So you can keep track of construction > progress. > Z-parameters are saved in text files. A header holds all the info on > construction parameters and. > I worked on further integrating polar codes into FECAPI. So, now you > can just open an example flowgraph and another flowgraph generates BER > curves for SC decoder and SC list decoder and for comparability a > convolutional code. > One odd thing about FECAPI, that I noticed, is bit-to-symbol mapping. > As far as I've seen it so far, most applications map 1 -> -1 and 0 -> > 1, or 2 * bit - 1. FECAPI handles this the other way round. At least > 'BER curve generator' behaves this way, so I assume that the other > decoder blocks expect the same mapping. > > That's it for the week. So far, I've dealt with all aspects of polar > codes. Now it's time to focus on VOLK optimization and algorithmic > optimization. > > A little goodie at the end [3]. I uploaded a BER comparison pic to > imgur. Be careful with absolute values though. I doubt Es/N0 is > accurate. But it gives you an impression. > > More info and current project progress can be found in [1] and [2]. > > Cheers > Johannes > > [1] https://github.com/jdemel/gnuradio > [2] https://github.com/jdemel/socis-proposal > [3] http://i.imgur.com/QXWdSPj.jpg > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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