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We have to recognize the changing channel state and apply it to communication technique for increasing transmission efficiency in the underwater acoustic channel. In this paper, we propose more reliable Doppler estimation method based on frequency average and remodulation. We conducted the simulation and sea trial to evaluate the performance of the proposed method. When the channel coding technique was not applied, the uncoded bit error rate performance of the proposed method was improved about maximum 50.3% compared with conventional method. <\/jats:p>","DOI":"10.1155\/2015\/746919","type":"journal-article","created":{"date-parts":[[2015,11,1]],"date-time":"2015-11-01T21:02:33Z","timestamp":1446411753000},"page":"746919","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":5,"title":["Doppler Estimation Based on Frequency Average and Remodulation for Underwater Acoustic Communication"],"prefix":"10.1177","volume":"11","author":[{"given":"Chan-Ho","family":"Hwang","sequence":"first","affiliation":[{"name":"Department of Radio Communication Engineering, Korea Maritime and Ocean University, Busan 606791, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ki-Man","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Radio Communication Engineering, Korea Maritime and Ocean University, Busan 606791, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung-Yong","family":"Chun","sequence":"additional","affiliation":[{"name":"Agency for Defense Development, Changwon, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sang-Kook","family":"Lee","sequence":"additional","affiliation":[{"name":"Agency for Defense Development, Changwon, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2015,11,1]]},"reference":[{"key":"B1-2015-746919","doi-asserted-by":"publisher","DOI":"10.1145\/1121776.1121779"},{"key":"B2-2015-746919","doi-asserted-by":"publisher","DOI":"10.4031\/002533208786861263"},{"volume-title":"An Introduction to Underwater Acoustics: Principles and Applications","year":"2002","author":"Lurton X.","key":"B3-2015-746919"},{"key":"B4-2015-746919","doi-asserted-by":"publisher","DOI":"10.1121\/1.2345910"},{"volume-title":"Space-Time Wireless Channels","year":"2003","author":"Durgin G. 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