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Iterative Decoding vs. Viterbi Decoding: A Comarison

17 Mar 2008 (Updated 18 Mar 2008)

No BSD License

rum .m file before running mdl file.

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Description	Abstract- Decoding algorithms employed in wireless communication use either hard decision decoding or soft decision decoding. Quantization is use in soft decision e.g. in Viterbi decoding. Similarly in iterative decoders (Turbo Codes) either serially concatenated or parallely concatenated decoders with interleavers use soft-input soft-output (SISO) and additive loglikelihood version (L-SISO) algorithms, to compute a posteriori probability (APP). Even though soft decision is more powerful than hard decision decoders, many systems can not use soft decision algorithms, e.g. in GSM. In GSM channel decoding is used after de-interleaving. So, if one were to use iterative decoding, one is constrained to hard decision decoders. We propose the uses of soft decision iterative decoders (Turbo codes) in place of hard decision data (i.e. data in binary format). We compare the performance of hard decision Viterbi decoding with iterative decoders.
Required Products	Communications Blockset Signal Processing Blockset Signal Processing Toolbox
MATLAB release	MATLAB 7.3 (R2006b)
Zip File Content
Other Files	mySCCC_test.mdl, my_SCCC_test.m

Tags for This File
Everyone's Tags	convolutional decoder(2), santosh shah, sccc, turbo code(2), viterbi decoder, wireless
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Comments and Ratings (2)
22 May 2008	Heri Firmansyah
17 Sep 2008	lila zinal	bonsoir j'ai utilise le programme de simulation mais j'ai obtenu le resultat de hard decision (Viterbi mieux que celui du soft decion du code concatene. please voulez vous m'aider ou m'orientez vers les valeurs de simulation par defaut.

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Tag Activity for this File
Tag	Applied By	Date/Time
wireless	Santosh Shah	22 Oct 2008 09:54:00
turbo code	Santosh Shah	22 Oct 2008 09:54:00
viterbi decoder	Santosh Shah	22 Oct 2008 09:54:00
convolutional decoder	Santosh Shah	22 Oct 2008 09:54:00
santosh shah	Santosh Shah	22 Oct 2008 09:54:00
sccc	Santosh Shah	22 Oct 2008 09:54:00
turbo code	puneetha reddy	13 May 2009 13:30:06
convolutional decoder	mo ?	20 Oct 2009 08:05:34

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