Coding

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Hamming (7,4) code with soft and hard decoding

by Krishna Sankar on March 15, 2012

ber_plot_hamming_7_4_code_soft_and_hard_decode_in_awgn

An earlier post we discussed hard decision decoding for a Hamming (7,4) code and simulated the the bit error rate. In this post, let us focus on the soft decision decoding for the Hamming (7,4) [...]

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Hamming (7,4) code with hard decision decoding

by Krishna Sankar on September 29, 2009

BER plot for Hamming (7,4) code with hard decision decoding in AWGN

In previous posts, we have discussed convolutional codes with Viterbi decoding (hard decision, soft decision and with finite traceback). Let us know discuss a block coding scheme where a group of information bits is mapped [...]

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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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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 [...]

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Convolutional code

by Krishna Sankar on January 4, 2009

convolutional_code

Coding is a technique where redundancy is added to original bit sequence to increase the reliability of the communication. In this article, lets discuss a simple binary convolutional coding scheme at the transmitter and the [...]

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.