Neural network aided soft decision decoding of block codes

Pao Yue-kong Library Electronic Theses Database

Neural network aided soft decision decoding of block codes

 

Author: Wong, Yiu-wah
Title: Neural network aided soft decision decoding of block codes
Degree: M.Sc.
Year: 1997
Subject: Data transmission systems
Coding theory
Decoders (Electronics)
Neural networks (Computer science)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: vi, 99 leaves : ill. ; 31 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1250506
URI: http://theses.lib.polyu.edu.hk/handle/200/4233
Abstract: Block decoding algorithms and convolutional decoding algorithms have been devised to operate with hard or soft decisions. However, soft-decision decoding is generally not used with block codes because it is considerably more difficult than hard-decision decoding to implement. Therefore, block codes are usually implemented with hard-decision decoders. Due to the complexity of block code soft-decision decoder, the implementation the block code soft-decision decoder based on neural network techniques will be attempted. There are many applications of neural networks in the area of soft decision decoding. In [5], the work presented assures us that we can use backpropagation as the training method for implementing soft decision decoder of block codes. In this dissertation, the concept of neural network aided soft decision decoding (NND) for block codes is presented. The architecture and algorithm for training a network by backpropagation has been investigated. The best suited modification that can be made to the training algorithm and meets the needs of soft decision decoder is implemented. The modifications involve changes to momentum parameter μ, steepness parameter σ and size of hidden neurons. Simulations have been performed that realize the theory and demonstrate the ability of neural networks to act as soft-decision decoder for block codes. Experimental results show that the performance of the neural network aided soft-decision decoder approaches that of maximum likelihood decoder. On the other hand, smaller steepness parameter and larger momentum parameter can reduce the training time. According to the simulation results, the training time can be reduced dramatically to a much smaller number of epochs from the required number of epoch with an acceptable performance.

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