NDLI: Asynchronous amplify-and-forward relay communications for underwater acoustic networks

Content Provider	IET Digital Library
Author	Cao, Rui Qu, Fengzhong Yang, Liuqing
Abstract	Underwater acoustic communications (UAC) feature frequency-dependent signal attenuation, long propagation delay and doubly-selective fading. Thus the design of reliable UAC protocols is challenging. On the other hand, cooperative relay communications, which have been extensively studied in terrestrial environments, are promising paradigms for reliable communications. However, their application to UAC has not been thoroughly explored. In this study, the authors will design an asynchronous relaying protocol to achieve reliable underwater communications. This new scheme accounts for and takes advantage of the unique characteristics of UAC channels. To avoid time synchronisation difficulty in UAC, and facilitate energy-efficient relay processing, asynchronous amplify-and-forward relaying is adopted in the protocol. In addition, precoded orthogonal frequency division multiplexing is chosen to address the frequency selectivity issue in UAC, while collecting ample multipath diversity provided by the channel and enabled by the asynchronous relaying design. To demonstrate the performance of the protocol, the end-to-end signal-to-noise ratio is derived, the average pair-wise error probability is evaluated and the maximum collectable diversity is also proven. Simulations and comparisons are presented to corroborate the analyses and design.
Starting Page	677
Ending Page	684
Page Count	8
ISSN	17518628
Volume Number	10
e-ISSN	17518636
Issue Number	Issue 6, Apr (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/10/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2014.1233
Journal	IET Communications
Publisher Date	2016-04-14
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Acoustic And Other Telecommunication System And Equipment Ample Multipath Diversity Amplify And Forward Communication Asynchronous Amplify And Forward Relay Communication Asynchronous Relaying Protocol Average Pairwise Error Probability Cooperative Communication Cooperative Relay Communication Diversity Reception Doubly Selective Fading End-to-end Signal-to-noise Ratio Energy Efficient Relay Processing Error Statistics Fading Channel Frequency Dependent Signal Attenuation Frequency Selective Surface Frequency Selectivity Modulation And Coding Method Multipath Channel OFDM Modulation Precoded Orthogonal Frequency Division Multiplexing Propagation Delay Protocol Radio Link And Equipment Relay Network Reliability Reliable Communication Reliable UAC Protocol Statistics Telecommunication Telecommunication Network Reliability Terrestrial Environment UAC Channel Underwater Acoustic Communication Underwater Acoustic Network
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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