variable-length error-correcting codes, suitable to perform joint source-channel coding, are presented. A maximum likelihood decoding algorithm for these codes is given. Some performance bounds are derived and it is s...
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variable-length error-correcting codes, suitable to perform joint source-channel coding, are presented. A maximum likelihood decoding algorithm for these codes is given. Some performance bounds are derived and it is shown that these codes are similar to convolutional codes. The free distance of these codes is defined and it is shown that it is the most important parameter that determines their performance at high E-b/N-o. It is shown that the performance of these codes can be better than a standard cascade of a Huffman code followed by a BCH code with the same code parameters.
Joint source-channel decoding has recently received extensive attention due to the rise in the applications of multimedia wireless communication. Based on a code trellis rather than on a code tree, this work presents ...
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Joint source-channel decoding has recently received extensive attention due to the rise in the applications of multimedia wireless communication. Based on a code trellis rather than on a code tree, this work presents a maximum a posteriori (MAP) soft-decision priority-first decoding algorithm and its approximations for variable-length error-correcting codes. Simulation results indicate that for the code with average codeword length 6.269 bits and free distance 3, under moderate signal-to-noise ratio, one of the proposed algorithms almost reaches the lowest decoding complexity, and has nearly the same performance on symbol error probability as the MAP decoding.
variable-lengthcodes are classically used for source coding to compress data. However, variable-lengtherror-correcting (VLEC) codes can also be used for channel coding where they are able to overcome the effects of ...
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ISBN:
(纸本)9781509000586
variable-lengthcodes are classically used for source coding to compress data. However, variable-lengtherror-correcting (VLEC) codes can also be used for channel coding where they are able to overcome the effects of channel impairments by detecting and correcting bit errors. Multi-objective optimization is an area of multiple criteria decision making, where an optimization algorithm attempts to solve a problem with more than one objective. In this paper, VLEC codes are constructed by taking into consideration their two main properties: Average Codeword length and Free Distance, associated respectively with their source and channel coding aspects. These two properties are taken as objectives in a Multi-objective global optimization genetic algorithm. It is shown that better codes can be constructed using this algorithm.
variable-lengthcodes are classically used for source coding to compress data. However, variable-lengtherror-correcting (VLEC) codes can also be used for channel coding where they are able to overcome the effects of ...
详细信息
ISBN:
(纸本)9781509000593
variable-lengthcodes are classically used for source coding to compress data. However, variable-lengtherror-correcting (VLEC) codes can also be used for channel coding where they are able to overcome the effects of channel impairments by detecting and correcting bit errors. Multi-objective optimization is an area of multiple criteria decision making, where an optimization algorithm attempts to solve a problem with more than one objective. In this paper, VLEC codes are constructed by taking into consideration their two main properties: Average Codeword length and Free Distance, associated respectively with their source and channel coding aspects. These two properties are taken as objectives in a Multi-objective global optimization genetic algorithm. It is shown that better codes can be constructed using this algorithm.
An optimised construction of variable-length error-correcting codes (VLEC) is proposed in this paper. Compared to the state-of-the-art, the three main improvements consist first in improving the codewords search algor...
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ISBN:
(纸本)0780377990
An optimised construction of variable-length error-correcting codes (VLEC) is proposed in this paper. Compared to the state-of-the-art, the three main improvements consist first in improving the codewords search algorithm complexity/efficiency trade-off, second in loosening the codewords deletion rule, and third in taking advantage of eventual previous searches. It is shown that the optimised algorithm can find good VLEC codes for alphabets up to 200 symbols, and outperforms existing algorithms.
This paper deals with codes that combine source and channel encoding operations. After discussing the potential usefulness of these variable-lengtherrorcorrecting (VLEC) codes, necessary conditions on their length d...
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ISBN:
(纸本)0780377990
This paper deals with codes that combine source and channel encoding operations. After discussing the potential usefulness of these variable-lengtherrorcorrecting (VLEC) codes, necessary conditions on their length distribution are established. It is shown that, depending on the targetted application, several families of VLEC codes can be defined, whose conditions of existence differ.
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