Viterbi

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Matlab or C for Viterbi Decoder?

by Krishna Sankar on August 21, 2009

Are you bothered by speed of the speed of the simulations which you develop in Matlab/Octave? I was not bothered much, till I ran into the Viterbi decoder. If you recall, the Matlab/Octave simulation script [...]

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Viterbi with finite survivor state memory

by Krishna Sankar on July 27, 2009

BER_vs_traceback_viterbi_decode_ebno_4db

In the post on Viterbi decoder and soft input Viterbi decoder, we discussed a convolutional encoding scheme with rate 1/2, constraint length and having generator polynomial and having generator polynomial . If the number of [...]

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Softbit for 16QAM

by Krishna Sankar on July 5, 2009

Gray coded 16QAM bit mapping for bit b1

In the post on Soft Input Viterbi decoder, we had discussed BPSK modulation with convolutional coding and soft input Viterbi decoding in AWGN channel. Let us know discuss the derivation of soft bits for 16QAM [...]

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Soft Input Viterbi decoder

by Krishna Sankar on January 14, 2009

BER plot for BPSK with AWGN in soft decision Viterbi decoding

In two previous posts, we have discussed Convolutional Coding and the associated hard decision Viterbi decoding. In this post lets extent Viterbi decoding algorithm to soft input decision scheme. The modulation used is BPSK and [...]

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Viterbi decoder

by Krishna Sankar on January 4, 2009

Branch Metric and Path Metric computation for Viterbi decoder

Coding is a technique where redundancy is added to original bit sequence to increase the reliability of the communication. Lets discuss a simple binary convolutional coding scheme at the transmitter and the associated Viterbi (maximum [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.