Relay-aided cooperative underwater acoustic communications: Selective relaying

Xilin Cheng, Rui Cao, Fengzhong Qu, Liuqing Yang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

16 Scopus citations

Abstract

Underwater acoustic communications (UAC) features frequency-dependent signal attenuation, long propagation delay, and doubly-selective fading. Thus, the design of reliable and efficient UAC protocols is very challenging. On the other hand, cooperative relay communications, which can provide reliable data transmission, is a very attractive technology for UAC. In our recent work, we proposed a practical asynchronous relaying protocol tailored for UAC: Asynchronous Amplify-and-forward relaying with Precoded OFDM (AsAP). This protocol resolves both the time synchronization difficulty and the frequency-selective issue of UAC channels. However, the AsAP protocol adopts fixed amplification and uniform power allocation among the source and the relays, which limits the system performance. Thus, in this paper, we design a modified AsAP system with an instantaneous amplification scheme, and investigate the optimum power allocation based on the criteria of maximum average SNR at the destination. Assuming statistical channel state information (CSI) is available, we analyze the average SNR at the destination and perform the power optimization on the AsAP system. The analytical results suggest a selective relaying scheme, where only the relay with best average SNR forwards the source information. Therefore, we propose an AsAP protocol with selective relaying (SR-AsAP). Finally, the performance of the new SR-AsAP scheme is simulated, and the benefits are illustrated through comparison with the direct-link system and the AsAP protocol.

Original languageEnglish (US)
Title of host publicationProgram Book - OCEANS 2012 MTS/IEEE Yeosu
Subtitle of host publicationThe Living Ocean and Coast - Diversity of Resources and Sustainable Activities
DOIs
StatePublished - 2012
Externally publishedYes
EventOCEANS 2012 MTS/IEEE Yeosu Conference: The Living Ocean and Coast - Diversity of Resources and Sustainable Activities - Yeosu, Korea, Republic of
Duration: May 21 2012May 24 2012

Publication series

NameProgram Book - OCEANS 2012 MTS/IEEE Yeosu: The Living Ocean and Coast - Diversity of Resources and Sustainable Activities

Other

OtherOCEANS 2012 MTS/IEEE Yeosu Conference: The Living Ocean and Coast - Diversity of Resources and Sustainable Activities
CountryKorea, Republic of
CityYeosu
Period5/21/125/24/12

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    Cheng, X., Cao, R., Qu, F., & Yang, L. (2012). Relay-aided cooperative underwater acoustic communications: Selective relaying. In Program Book - OCEANS 2012 MTS/IEEE Yeosu: The Living Ocean and Coast - Diversity of Resources and Sustainable Activities [6263434] (Program Book - OCEANS 2012 MTS/IEEE Yeosu: The Living Ocean and Coast - Diversity of Resources and Sustainable Activities). https://doi.org/10.1109/OCEANS-Yeosu.2012.6263434