{"title":"Using multi-frequency modulation in a modem for the transmission of near-realtime video in an underwater environment","authors":"R.S. Bradbeer, Member, Eric Law, F. Lam, Yeung","doi":"10.1109/ICCE.2003.1218974","DOIUrl":null,"url":null,"abstract":"The system described in this paper uses multicarrier modulation, and has been successfully tested at a data rate up to 10 kbps over 1 km. The system algorithm generates 48 frequencies for transmitting 48 parallel bits of data in each packet. A long transmitted signal sequence is combined with synchronisation, zero gap and information packets. The long multi-frequency signal packets have been implemented to minimise the effect of multipath fading, which is a particular problem in shallow, open water environments. To acquire the starting point of the transmitting sequence, a linear frequency modulation (LFM) signal is used for synchronisation. In order to reduce noise, adaptive threshold packets are used to set up a suitable signal. Experimental results from sea-trials have shown that the system can cope with multipath fading environments.","PeriodicalId":319221,"journal":{"name":"2003 IEEE International Conference on Consumer Electronics, 2003. ICCE.","volume":"158 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2003-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"16","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2003 IEEE International Conference on Consumer Electronics, 2003. ICCE.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICCE.2003.1218974","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 16
Abstract
The system described in this paper uses multicarrier modulation, and has been successfully tested at a data rate up to 10 kbps over 1 km. The system algorithm generates 48 frequencies for transmitting 48 parallel bits of data in each packet. A long transmitted signal sequence is combined with synchronisation, zero gap and information packets. The long multi-frequency signal packets have been implemented to minimise the effect of multipath fading, which is a particular problem in shallow, open water environments. To acquire the starting point of the transmitting sequence, a linear frequency modulation (LFM) signal is used for synchronisation. In order to reduce noise, adaptive threshold packets are used to set up a suitable signal. Experimental results from sea-trials have shown that the system can cope with multipath fading environments.
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