matlab code for hard versus soft decision decoding?

[h.raakesh]

soft decode

do u people have a c code for soft decision viterbi decoder

 

[cmangaraju]

phil karns viterbi decoder

viterbi decoder can be implemnted in two ways

1. hard decision viterbi decoder ----- input is (1/0) here we use hamming distance for metric calculation.


2. soft decision viterbi decoder ------- input is soft decision ie 2 or 3 or ........9 . it depends on the demapper which is before your viterbi decoder block. and the out put is hard ie (1/0) .

3. soft output viterbi decoder ............ here you will get input as soft data and output also soft.



i had implemented hard and soft decision viterbi decoder in verilog sucessfully for constraint length 1/2,1/3.... for ASIC .

if you have any doubts you can mail to cmangaraju@gmail.com

 

[mariuszprus]

soft viterbi decoding?

I need your help. I need viterbi algorithm in c++ with realize algorithm of Trellis code decoding . if somebody have or found this algorithm i will be happy . I am from poland and I dont know good english .

I need code with realize viterbi decoding for this encoder
http://www.fotosik.pl/pokaz_obrazek/dbbff2c0e10314fb.html

please help ..;(;(;(;(;(;(;(;(;(

i realize viterbi decoder from this code http://the-art-of-ecc.com/9_Coded_Mod/TCM/tcm_8psk.c but this is good only for first coder with have parallel transition ...
please help ;SadSadSadSadSad