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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\u2009dB, respectively, at the bit error rate of 10<jats:sup>\u22125<\/jats:sup>. <\/jats:p>","DOI":"10.1155\/2016\/8906985","type":"journal-article","created":{"date-parts":[[2016,2,23]],"date-time":"2016-02-23T21:02:34Z","timestamp":1456261354000},"page":"8906985","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Optimization of LDPC Codes over the Underwater Acoustic Channel"],"prefix":"10.1177","volume":"12","author":[{"given":"Shengxing","family":"Liu","sequence":"first","affiliation":[{"name":"Department of Applied Marine Physics and Engineering, Xiamen University, Xiamen 361102, China"},{"name":"Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Ministry of Education, Xiamen University, 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