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Wireless Communications and Mobile Computing
Volume 2017, Article ID 9727360, 10 pages
https://doi.org/10.1155/2017/9727360
Research Article

Optimized Power Allocation and Relay Location Selection in Cooperative Relay Networks

1School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
2National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China

Correspondence should be addressed to Bin Jiang; nc.ude.udh@nibgnaij

Received 4 April 2017; Revised 2 July 2017; Accepted 11 October 2017; Published 9 November 2017

Academic Editor: Haiyu Huang

Copyright © 2017 Jianrong Bao 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

An incremental selection hybrid decode-amplify forward (ISHDAF) scheme for the two-hop single relay systems and a relay selection strategy based on the hybrid decode-amplify-and-forward (HDAF) scheme for the multirelay systems are proposed along with an optimized power allocation for the Internet of Thing (IoT). Given total power as the constraint and outage probability as an objective function, the proposed scheme possesses good power efficiency better than the equal power allocation. By the ISHDAF scheme and HDAF relay selection strategy, an optimized power allocation for both the source and relay nodes is obtained, as well as an effective reduction of outage probability. In addition, the optimal relay location for maximizing the gain of the proposed algorithm is also investigated and designed. Simulation results show that, in both single relay and multirelay selection systems, some outage probability gains by the proposed scheme can be obtained. In the comparison of the optimized power allocation scheme with the equal power allocation one, nearly 0.1695 gains are obtained in the ISHDAF single relay network at a total power of 2 dB, and about 0.083 gains are obtained in the HDAF relay selection system with 2 relays at a total power of 2 dB.