Optimization of LDPC Codes over the Underwater Acoustic Channel
To combat severe intersymbol interference incurred by multipath propagation of sound waves in the underwater acoustic environment, we introduce an iterative equalization and decoding scheme by iteratively exchanging soft information between a low-density parity check (LDPC) decoder and a decision fe...
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| Format: | Article |
| Language: | English |
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Wiley
2016-02-01
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| Series: | International Journal of Distributed Sensor Networks |
| Online Access: | https://doi.org/10.1155/2016/8906985 |
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| _version_ | 1850229140336148480 |
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| author | Shengxing Liu Aijun Song |
| author_facet | Shengxing Liu Aijun Song |
| author_sort | Shengxing Liu |
| collection | DOAJ |
| description | To combat severe intersymbol interference incurred by multipath propagation of sound waves in the underwater acoustic environment, we introduce an iterative equalization and decoding scheme by iteratively exchanging soft information between a low-density parity check (LDPC) decoder and a decision feedback equalizer. We apply extrinsic information transfer (EXIT) charts to analyze performance of LDPC codes over the acoustic multipath channel. Furthermore, using differential evolution technique, we develop an EXIT-aided method to optimize LDPC codes for the underwater acoustic channel. Design examples are presented for two different realizations of the underwater acoustic channel that are generated by an acoustic ray tracing model. Computer simulations show that the optimized LDPC codes outperform its regular counterpart or Turbo codes under the same coding rate and block length, with gains of 1.0 and 0.8 dB, respectively, at the bit error rate of 10 −5 . |
| format | Article |
| id | doaj-art-27ebe102e7be4bc5a09ee6b1e546264d |
| institution | OA Journals |
| issn | 1550-1477 |
| language | English |
| publishDate | 2016-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Distributed Sensor Networks |
| spelling | doaj-art-27ebe102e7be4bc5a09ee6b1e546264d2025-08-20T02:04:19ZengWileyInternational Journal of Distributed Sensor Networks1550-14772016-02-011210.1155/2016/89069858906985Optimization of LDPC Codes over the Underwater Acoustic ChannelShengxing Liu0Aijun Song1 Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Ministry of Education, Xiamen University, Xiamen 361102, China Department of Electrical and Computer Engineering, University of Alabama, Tuscaloosa, AL 35487, USATo combat severe intersymbol interference incurred by multipath propagation of sound waves in the underwater acoustic environment, we introduce an iterative equalization and decoding scheme by iteratively exchanging soft information between a low-density parity check (LDPC) decoder and a decision feedback equalizer. We apply extrinsic information transfer (EXIT) charts to analyze performance of LDPC codes over the acoustic multipath channel. Furthermore, using differential evolution technique, we develop an EXIT-aided method to optimize LDPC codes for the underwater acoustic channel. Design examples are presented for two different realizations of the underwater acoustic channel that are generated by an acoustic ray tracing model. Computer simulations show that the optimized LDPC codes outperform its regular counterpart or Turbo codes under the same coding rate and block length, with gains of 1.0 and 0.8 dB, respectively, at the bit error rate of 10 −5 .https://doi.org/10.1155/2016/8906985 |
| spellingShingle | Shengxing Liu Aijun Song Optimization of LDPC Codes over the Underwater Acoustic Channel International Journal of Distributed Sensor Networks |
| title | Optimization of LDPC Codes over the Underwater Acoustic Channel |
| title_full | Optimization of LDPC Codes over the Underwater Acoustic Channel |
| title_fullStr | Optimization of LDPC Codes over the Underwater Acoustic Channel |
| title_full_unstemmed | Optimization of LDPC Codes over the Underwater Acoustic Channel |
| title_short | Optimization of LDPC Codes over the Underwater Acoustic Channel |
| title_sort | optimization of ldpc codes over the underwater acoustic channel |
| url | https://doi.org/10.1155/2016/8906985 |
| work_keys_str_mv | AT shengxingliu optimizationofldpccodesovertheunderwateracousticchannel AT aijunsong optimizationofldpccodesovertheunderwateracousticchannel |