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Journal of Electrical and Computer Engineering
Volume 2017, Article ID 5793507, 9 pages
https://doi.org/10.1155/2017/5793507
Research Article

Data Selective Rake Reception for Underwater Acoustic Communication in Strong Multipath Interference

1Department of Electrical and Electronic Engineering, Kitami Institute of Technology, Kitami, Japan
2Mitsubishi Electric TOKKI Systems Corporation, Kanagawa, Japan

Correspondence should be addressed to Shingo Yoshizawa; pj.ca.ti-imatik.liam@awazisoy

Received 6 January 2017; Accepted 3 April 2017; Published 22 May 2017

Academic Editor: George S. Tombras

Copyright © 2017 Shingo Yoshizawa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In underwater acoustic communication (UAC), very long delay waves are caused by reflection from water surfaces and bottoms and obstacles. Their waves interfere with desired waves and induce strong multipath interference. Use of a guard interval (GI) is effective for channel compensation in OFDM. However, a GI tends to be long in shallow-water environment because a guard time is determined by a delay time of multipath. A long GI produces a very long OFDM frame in several seconds, which is disadvantageous to a response speed of communication. This paper presents a method of keeping good communication performance even for a short GI. We discuss influence of intercarrier interference (ICI) in OFDM demodulation and propose a method of data selective rake reception (DSRake). The effectiveness of the proposed method is discussed by received signal distribution and confirmed by simulation results.