Robust Transmissions in Wireless-Powered Multi-Relay Networks With Chance Interference Constraints

In this paper, we consider a wireless powered multi-relay network in which a multi-antenna hybrid access point underlaying a cellular system transmits information to distant receivers. Multiple relays capable of energy harvesting are deployed in the network to assist the information transmission. Th...

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Published inIEEE transactions on communications Vol. 67; no. 2; pp. 973 - 987
Main Authors Xu, Jing, Zou, Yuze, Gong, Shimin, Gao, Lin, Niyato, Dusit, Cheng, Wenqing
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Algorithms
Array signal processing
Beamforming
channel uncertainty
Couplings
distributed relay beamforming
Energy harvesting
Energy transmission
Information transfer
Interference
monotonic optimization
Optimization
Receivers
Relay networks
Relays
Robustness (mathematics)
Switching theory
Throughput
Wireless communication
Wireless networks
Wireless powered communications
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Abstract In this paper, we consider a wireless powered multi-relay network in which a multi-antenna hybrid access point underlaying a cellular system transmits information to distant receivers. Multiple relays capable of energy harvesting are deployed in the network to assist the information transmission. The hybrid access point can wirelessly supply energy to the relays, achieving multi-user gains from signal and energy cooperation. We propose a joint optimization for signal beamforming of the hybrid access point as well as wireless energy harvesting and collaborative beamforming strategies of the relays. The objective is to maximize the network throughput subject to probabilistic interference constraints at the cellular user equipment. We formulate the throughput maximization with both the time-switching and power-splitting schemes, which impose very different couplings between the operating parameters for wireless power and information transfer. Although the optimization problems are inherently non-convex, they share similar structural properties that can be leveraged for an efficient algorithm design. In particular, by exploiting monotonicity in the throughput, we maximize it iteratively via customized polyblock approximation with reduced complexity. The numerical results show that the proposed algorithms can achieve close to optimal performance in terms of the energy efficiency and throughput
AbstractList In this paper, we consider a wireless powered multi-relay network in which a multi-antenna hybrid access point underlaying a cellular system transmits information to distant receivers. Multiple relays capable of energy harvesting are deployed in the network to assist the information transmission. The hybrid access point can wirelessly supply energy to the relays, achieving multi-user gains from signal and energy cooperation. We propose a joint optimization for signal beamforming of the hybrid access point as well as wireless energy harvesting and collaborative beamforming strategies of the relays. The objective is to maximize the network throughput subject to probabilistic interference constraints at the cellular user equipment. We formulate the throughput maximization with both the time-switching and power-splitting schemes, which impose very different couplings between the operating parameters for wireless power and information transfer. Although the optimization problems are inherently non-convex, they share similar structural properties that can be leveraged for an efficient algorithm design. In particular, by exploiting monotonicity in the throughput, we maximize it iteratively via customized polyblock approximation with reduced complexity. The numerical results show that the proposed algorithms can achieve close to optimal performance in terms of the energy efficiency and throughput
Author Xu, Jing
Cheng, Wenqing
Gao, Lin
Gong, Shimin
Zou, Yuze
Niyato, Dusit
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Snippet In this paper, we consider a wireless powered multi-relay network in which a multi-antenna hybrid access point underlaying a cellular system transmits...
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SubjectTerms Algorithms
Array signal processing
Beamforming
channel uncertainty
Couplings
distributed relay beamforming
Energy harvesting
Energy transmission
Information transfer
Interference
monotonic optimization
Optimization
Receivers
Relay networks
Relays
Robustness (mathematics)
Switching theory
Throughput
Wireless communication
Wireless networks
Wireless powered communications
Title Robust Transmissions in Wireless-Powered Multi-Relay Networks With Chance Interference Constraints
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Volume 67
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