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TCP-group 1995


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Viterbi decoder package released



As promised, I have uploaded my Viterbi decoder package:

ftp://ftp.ucsd.edu/hamradio/packet/tcpip/incoming/viterbi.tar.gz
ftp://ftp.ucsd.edu/hamradio/packet/tcpip/incoming/viterbi.zip

This package implements a coder and soft decision Viterbi (maximum
likelihood) decoder for the rate 1/2 K=7 NASA standard convolutional
code. It includes a driver program for test purposes.

The decoder runs at about 45.5 kilobits/sec on a 66 MHz 486DX2 under
BSDI1.1 and gcc 1.42. (Interestingly enough, it runs only about 40.8
kb/s under gcc 2.5.8, even with full optimization).  This is about
6.6x slower than my Fano decoder on a "clean" channel. But unlike a
Fano decoder, which bogs down on a noisy channel, the Viterbi decoder
runs at a constant rate even when the signal is very weak (though not
without errors, of course).

Phil






Document URL : http://www.a00.de/tcpgroup/1995/msg00222.php
Ralf D. Kloth, Ludwigsburg, DE (QRQ.software). < hostmaster at a00.de > [don't send spam]
Created 2005-01-02. Last modified 2005-01-02. Your visit 2020-10-27 08:34.33. Page created in 0.0495 sec.
 
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