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Symmetry 2017, 9(3), 38; doi:10.3390/sym9030038

Transmission Power Adaption for Full-Duplex Relay-Aided Device-to-Device Communication

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang Province, China
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Academic Editor: Angel Garrido
Received: 1 December 2016 / Revised: 7 February 2017 / Accepted: 3 March 2017 / Published: 9 March 2017
(This article belongs to the Special Issue Symmetry in Complex Networks II)
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Abstract

Device-to-device (D2D) communications bring significant improvements of spectral efficiency by underlaying cellular networks. However, they also lead to a more deteriorative interference environment for cellular users, especially the users in severely deep fading or shadowing. In this paper, we investigate a relay-based communication scheme in cellular systems, where the D2D communications are exploited to aid the cellular downlink transmissions by acting as relay nodes with underlaying cellular networks. We modeled two-antenna infrastructure relays employed for D2D relay. The D2D transmitter is able to transmit and receive signals simultaneously over the same frequency band. Then we proposed an efficient power allocation algorithm for the base station (BS) and D2D relay to reduce the loopback interference which is inherent due to the two-antenna infrastructure in full-duplex (FD) mode. We derived the optimal power allocation problem in closed form under the independent power constraint. Simulation results show that the algorithm reduces the power consumption of D2D relay to the greatest extent and also guarantees cellular users’ minimum transmit rate. Moreover, it also outperforms the existing half-duplex (HD) relay mode in terms of achievable rate of D2D. View Full-Text
Keywords: device-to-device (D2D); relay aided; full-duplex (FD); power allocation; independent power constraint device-to-device (D2D); relay aided; full-duplex (FD); power allocation; independent power constraint
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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. (CC BY 4.0).

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Dun, H.; Ye, F.; Li, Y. Transmission Power Adaption for Full-Duplex Relay-Aided Device-to-Device Communication. Symmetry 2017, 9, 38.

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