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Using Fast Frequency Hopping Technique to Improve Reliability of Underwater Communication System

Abstract

Acoustic underwater communication systems designed to work reliably in shallow coastal waters must overcome major limitations such as multipath propagation and the Doppler effect. These restrictions are the reason for the complexity of receivers being built, whose task is to decode a symbol on the basis of the received signal. Additional complications are caused by the low propagation speed of the acoustic wave in the water and the relatively narrow bandwidth. Despite the continuous development of communication systems using coherent modulations, they are still not as reliable as is desirable for reliable data transmission applications. This article presents an acoustic underwater communication system that uses one of the varieties of the spread spectrum technique i.e., the fast frequency hopping technique (FFH). This technique takes advantage of binary frequency-shift keying (BFSK) with an incoherent detection method to ensure the implementation of a system whose main priority is reliable data transmission and secondary priority is the transmission rate. The compromised choice of parameters consisted of the selection between the narrow band of the hydroacoustic transducer and the maximum number of carrier frequency hops, which results from the need to take into account the effects of the Doppler effect. In turn, the number of hops and the symbol duration were selected adequately for the occurrence of multipath propagations of an acoustic wave. In addition, this article describes experimental communication tests carried out using a laboratory model of the FFH-BFSK data transmission system in the shallow water environment of Lake Wdzydze/Poland. The test results obtained for three channels of different lengths are discussed.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
Applied Sciences-Basel no. 10, pages 1 - 12,
ISSN: 2076-3417
Language:
English
Publication year:
2020
Bibliographic description:
Schmidt J.: Using Fast Frequency Hopping Technique to Improve Reliability of Underwater Communication System// Applied Sciences-Basel -Vol. 10,iss. 3 (2020), s.1-12
DOI:
Digital Object Identifier (open in new tab) 10.3390/app10031172
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