Precoder Design for Simultaneous Wireless Information and Power Transfer Systems With Finite-Alphabet Inputs

Existing research on a simultaneous wireless information and power transfer (SWIPT) system is based on the assumption of Gaussian inputs. However, the optimal design on Gaussian inputs may lead to dramatic performance loss for practical systems with finite-alphabet inputs. This paper focuses on the...

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Veröffentlicht in:	IEEE transactions on vehicular technology Jg. 66; H. 10; S. 9085 - 9097
Hauptverfasser:	Zhu, Xiaodong, Zeng, Weiliang, Xiao, Chengshan
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	New York IEEE 01.10.2017 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:	Algorithm design and analysis Algorithms Codes Computer simulation Design optimization Energy harvesting Energy transmission Finite-alphabet inputs MIMO Mutual information Optimization Polynomials Power management Power transfer precoder design Receivers Semidefinite programming simultaneous wireless information and power transfer (SWIPT) Software radio Transmitters
ISSN:	0018-9545, 1939-9359
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Abstract	Existing research on a simultaneous wireless information and power transfer (SWIPT) system is based on the assumption of Gaussian inputs. However, the optimal design on Gaussian inputs may lead to dramatic performance loss for practical systems with finite-alphabet inputs. This paper focuses on the precoder design for a SWIPT system with finite-alphabet inputs and instantaneous channel state information over a multiple-input multiple-output channel. We formulate the optimal precoder design as an optimization problem, in which the objective is to maximize the mutual information over the channel from the transmitter to the information receiver under the constraints of transmit power and harvested energy threshold. The formulated problem is NP-hard, so a global optimal solution cannot be found within the polynomial time. The main contributions of this paper are as follows: 1) By using its structure, the NP-hard problem is relaxed to a semidefinite programming problem. Then, a general solving framework for both co-located and separated receiver cases, based on the semidefinite relaxation (SDR) technique, is developed to achieve a near optimal precoder. 2) For the case of co-located receivers, we show that the optimal precoder design is a concave problem with respect to power allocation; then, a specific algorithm for co-located receivers is proposed. Compared with the general SDR-based method, the specific algorithm for co-located receivers exhibits almost the same performance but much lower complexity. 3) The performance of several practical co-located receiver designs is analyzed in SWIPT systems with finite-alphabet inputs. Finally, we provide simulation results to show the efficacy of the proposed algorithms.
AbstractList	Existing research on a simultaneous wireless information and power transfer (SWIPT) system is based on the assumption of Gaussian inputs. However, the optimal design on Gaussian inputs may lead to dramatic performance loss for practical systems with finite-alphabet inputs. This paper focuses on the precoder design for a SWIPT system with finite-alphabet inputs and instantaneous channel state information over a multiple-input multiple-output channel. We formulate the optimal precoder design as an optimization problem, in which the objective is to maximize the mutual information over the channel from the transmitter to the information receiver under the constraints of transmit power and harvested energy threshold. The formulated problem is NP-hard, so a global optimal solution cannot be found within the polynomial time. The main contributions of this paper are as follows: 1) By using its structure, the NP-hard problem is relaxed to a semidefinite programming problem. Then, a general solving framework for both co-located and separated receiver cases, based on the semidefinite relaxation (SDR) technique, is developed to achieve a near optimal precoder. 2) For the case of co-located receivers, we show that the optimal precoder design is a concave problem with respect to power allocation; then, a specific algorithm for co-located receivers is proposed. Compared with the general SDR-based method, the specific algorithm for co-located receivers exhibits almost the same performance but much lower complexity. 3) The performance of several practical co-located receiver designs is analyzed in SWIPT systems with finite-alphabet inputs. Finally, we provide simulation results to show the efficacy of the proposed algorithms.
Author	Xiao, Chengshan Zeng, Weiliang Zhu, Xiaodong
Author_xml	– sequence: 1 givenname: Xiaodong orcidid: 0000-0002-2431-1730 surname: Zhu fullname: Zhu, Xiaodong email: zxdong@uestc.edu.cn organization: School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, China – sequence: 2 givenname: Weiliang surname: Zeng fullname: Zeng, Weiliang email: wzeng@qti.qualcomm.com organization: Division of Corporate R&D, Qualcomm Inc., San Diego, CA, USA – sequence: 3 givenname: Chengshan surname: Xiao fullname: Xiao, Chengshan email: xiaoc@mst.edu organization: Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO, USA
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SubjectTerms	Algorithm design and analysis Algorithms Codes Computer simulation Design optimization Energy harvesting Energy transmission Finite-alphabet inputs MIMO Mutual information Optimization Polynomials Power management Power transfer precoder design Receivers Semidefinite programming simultaneous wireless information and power transfer (SWIPT) Software radio Transmitters
Title	Precoder Design for Simultaneous Wireless Information and Power Transfer Systems With Finite-Alphabet Inputs
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