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.
Highlights
Multiple-input multiple-output (MIMO), as a milestone in the development of wireless communications, brought an efficient transmission rate and reliability
For a single relay network, the outage performances by the proposed hybrid decode-amplify-andforward (HDAF) and incremental selection hybrid decode-amplify forward (ISHDAF) strategy are compared
The proposed scheme can only occupy a small amount of time complexity to obtain the power allocation optimization in a cooperative communication system
Summary
Multiple-input multiple-output (MIMO), as a milestone in the development of wireless communications, brought an efficient transmission rate and reliability. A joint relay selection and power allocation scheme for cooperative wireless sensor networks was proposed in [14] It adaptively chose the proper relays and their transmission power to maximize the signal-to-noise ratio (SNR) at the destination by the channel state information (CSI). A SNR-based relay selection for IHDAF cooperative diversity protocol was proposed in [15], and the closed-form expressions of average channel capacity and outage probability were derived simultaneously. By analyzing a two-hop single relay cooperative network with an ISHDAF scheme and the multirelay selection strategy with a HDAF scheme, an optimized power allocation is proposed. It differs from the source node sending new messages to the destination node directly in the incremental relaying protocol It can be more suited for all kinds of the multiple relay channel status and obviously improves the systematic outage probability without any complexity increase.
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