In this paper we are interested to the decoding of blocks turbo codes constructed from Reed Solomon (RS) codes. We have modified the iterative algorithm proposed by chase in order to exploit the a priori information p...
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ISBN:
(纸本)9781538621233
In this paper we are interested to the decoding of blocks turbo codes constructed from Reed Solomon (RS) codes. We have modified the iterative algorithm proposed by chase in order to exploit the a priori information provided by a correlated source. Indeed, some sources such as images have a strong correlation. A simple iterative decoding algorithm does not take this feature into account. The choice of using RS turbo codes has an advantage compared to the BCH turbo codes when we focus on the example of the image, which is a good representative of correlated sources. A bijection between the pixels of the image and the symbols of the codes will be considered to introduce the bidirectional correlation in the iterative decoding of the rows and columns. Simulation results show that a significant performance gain is obtained with this type of decoding, compared to a classical RS turbo decoding, in case of correlated source and also in case of image transmission.
In this paper, we present a hard-decision decoding technique based on Genetic algorithms (HDGA), which is applicable to the general case where the only known structure is given by the generating matrix G. We also pres...
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In this paper, we present a hard-decision decoding technique based on Genetic algorithms (HDGA), which is applicable to the general case where the only known structure is given by the generating matrix G. We also present a new soft-decision decoding based on HDGA and the chase algorithm (SDGA). The simulations, applied on some binary Linear Block Codes, show that the genetic decoder has the same performance as the Berlekamp-Massey algorithm (BMA) and SDGA is equivalent to soft-decision decoding using chase algorithm and BMA (chase-BMA).
A novel adaptive threshold-decoding algorithm for block turbo codes (BTCs) was proposed. Simulations for a few combinations of BCH codes were carried out with the proposed algorithm and chase algorithm for the purpose...
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A novel adaptive threshold-decoding algorithm for block turbo codes (BTCs) was proposed. Simulations for a few combinations of BCH codes were carried out with the proposed algorithm and chase algorithm for the purpose of comparison. The error correction performance with the suggested algorithm was negligibly degraded comparing with that using the chase algorithm while it gained 1dB at BER=10{sup}(-4) against Fragiacomo et al. 's results. Furthermore, the suggested algorithm reduced the number of codewords to be searched and speeded up the decoding process.
Soft decision decoding is a decoding method which can cut the decoding error probability as compared with hard decision decoding by utilizing the channel measurement information effectively. In this paper, a new soft ...
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