{"title":"Shallow underwater communication with passive phase conjugation and iterative demodulation and decoding","authors":"Christopher Keeser, B. Belzer, T. Fischer","doi":"10.1109/CISS.2009.5054846","DOIUrl":null,"url":null,"abstract":"We propose passive phase conjugation (PPC) with iterative demodulation and decoding for communication over the shallow underwater acoustic channel. PPC mitigates inter-symbol interference (ISI) caused by multipath in the channel. A softinput, soft-output (SISO) differential BPSK (DBPSK) demodulator and a SISO irregular repeat accumulate (IRA) channel decoder arranged in an iterative ‘turbo’ structure improve the bit error rate (BER) at higher symbol rates. A linear estimator tracks channel phase variations arising from Doppler effects and wave motion. The system was tested at Lake Pend Oreille in Idaho over a distance of 1.78 km in shallow water with BERs below 10−5 at 2,500 information bits per second.","PeriodicalId":433796,"journal":{"name":"2009 43rd Annual Conference on Information Sciences and Systems","volume":"287 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2009-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2009 43rd Annual Conference on Information Sciences and Systems","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CISS.2009.5054846","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
We propose passive phase conjugation (PPC) with iterative demodulation and decoding for communication over the shallow underwater acoustic channel. PPC mitigates inter-symbol interference (ISI) caused by multipath in the channel. A softinput, soft-output (SISO) differential BPSK (DBPSK) demodulator and a SISO irregular repeat accumulate (IRA) channel decoder arranged in an iterative ‘turbo’ structure improve the bit error rate (BER) at higher symbol rates. A linear estimator tracks channel phase variations arising from Doppler effects and wave motion. The system was tested at Lake Pend Oreille in Idaho over a distance of 1.78 km in shallow water with BERs below 10−5 at 2,500 information bits per second.
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