Wireless Information and Power Transfer in Multiuser OFDM Systems
Xun Zhou,Rui Zhang,Chin Keong Ho +2 more
- Vol. 13, Iss: 4, pp 2282-2294
Reads0
Chats0
TLDR
It is revealed that the peak power constraint imposed on each OFDM SC as well as the number of users in the system play key roles in the rate-energy performance comparison by the two proposed schemes.Abstract:
In this paper, we study the optimal design for simultaneous wireless information and power transfer (SWIPT) in downlink multiuser orthogonal frequency division multiplexing (OFDM) systems, where the users harvest energy and decode information using the same signals received from a fixed access point (AP). For information transmission, we consider two types of multiple access schemes, namely, time division multiple access (TDMA) and orthogonal frequency division multiple access (OFDMA). At the receiver side, due to the practical limitation that circuits for harvesting energy from radio signals are not yet able to decode the carried information directly, each user applies either time switching (TS) or power splitting (PS) to coordinate the energy harvesting (EH) and information decoding (ID) processes. For the TDMA-based information transmission, we employ TS at the receivers; for the OFDMA-based information transmission, we employ PS at the receivers. Under the above two scenarios, we address the problem of maximizing the weighted sum-rate over all users by varying the time/frequency power allocation and either TS or PS ratio, subject to a minimum harvested energy constraint on each user as well as a peak and/or total transmission power constraint. For the TS scheme, by an appropriate variable transformation the problem is reformulated as a convex problem, for which the optimal power allocation and TS ratio are obtained by the Lagrange duality method. For the PS scheme, we propose an iterative algorithm to optimize the power allocation, subcarrier (SC) allocation and the PS ratio for each user. The performances of the two schemes are compared numerically as well as analytically for the special case of single-user setup. It is revealed that the peak power constraint imposed on each OFDM SC as well as the number of users in the system play key roles in the rate-energy performance comparison by the two proposed schemes.read more
Citations
More filters
Journal ArticleDOI
Wireless Networks With RF Energy Harvesting: A Contemporary Survey
TL;DR: This paper presents an overview of the RF-EHNs including system architecture, RF energy harvesting techniques, and existing applications, and explores various key design issues according to the network types, i.e., single-hop networks, multiantenna networks, relay networks, and cognitive radio networks.
Journal ArticleDOI
Wireless powered communication: opportunities and challenges
Suzhi Bi,Chin Keong Ho,Rui Zhang +2 more
TL;DR: An overview of state-of- the-art RF-enabled WET technologies and their applications to wireless communications, highlighting the key design challenges, solutions, and opportunities ahead.
Journal ArticleDOI
Simultaneous Wireless Information and Power Transfer (SWIPT): Recent Advances and Future Challenges
Tharindu D. Ponnimbaduge Perera,Dushantha Nalin K. Jayakody,Shree Krishna Sharma,Symeon Chatzinotas,Jun Li +4 more
TL;DR: This paper identifies and provides a detailed description of various potential emerging technologies for the fifth generation communications with SWIPT/WPT and provides some interesting research challenges and recommendations with the objective of stimulating future research in this emerging domain.
Journal ArticleDOI
Fundamentals of Wireless Information and Power Transfer: From RF Energy Harvester Models to Signal and System Designs
TL;DR: This paper highlights three different energy harvester models, namely, one linear model and two nonlinear models, and shows how WIPT designs differ for each of them in single-user and multi-user deployments, and identifies the fundamental tradeoff between conveying information and power wirelessly.
Journal ArticleDOI
Joint Transmit Beamforming and Receive Power Splitting for MISO SWIPT Systems
TL;DR: It is proved that SDR is indeed tight for the problem and thus achieves its global optimum and two suboptimal solutions of lower complexity are proposed, where the zero-forcing (ZF) and the SINR-optimal based transmit beamforming schemes are applied, respectively.
References
More filters
Book
Convex Optimization
Stephen Boyd,Lieven Vandenberghe +1 more
TL;DR: In this article, the focus is on recognizing convex optimization problems and then finding the most appropriate technique for solving them, and a comprehensive introduction to the subject is given. But the focus of this book is not on the optimization problem itself, but on the problem of finding the appropriate technique to solve it.
Journal ArticleDOI
MIMO Broadcasting for Simultaneous Wireless Information and Power Transfer
Rui Zhang,Chin Keong Ho +1 more
TL;DR: This paper studies a multiple-input multiple-output (MIMO) wireless broadcast system consisting of three nodes, where one receiver harvests energy and another receiver decodes information separately from the signals sent by a common transmitter, and all the transmitter and receivers may be equipped with multiple antennas.
Proceedings ArticleDOI
Transporting information and energy simultaneously
TL;DR: The fundamental tradeoff between the rates at which energy and reliable information can be transmitted over a single noisy line is studied.
Journal ArticleDOI
Relaying Protocols for Wireless Energy Harvesting and Information Processing
TL;DR: The numerical analysis provides practical insights into the effect of various system parameters, such as energy harvesting time, power splitting ratio, source transmission rate, source to relay distance, noise power, and energy harvesting efficiency, on the performance of wireless energy harvesting and information processing using AF relay nodes.
Journal ArticleDOI
Dual methods for nonconvex spectrum optimization of multicarrier systems
TL;DR: It is shown that under a certain condition called the time-sharing condition, the duality gap of the optimization problem is always zero, regardless of the convexity of the objective function, which leads to efficient numerical algorithms that solve the nonconvex problem in the dual domain.
Related Papers (5)
MIMO Broadcasting for Simultaneous Wireless Information and Power Transfer
Rui Zhang,Chin Keong Ho +1 more
Wireless Information and Power Transfer: Architecture Design and Rate-Energy Tradeoff
Xun Zhou,Rui Zhang,Chin Keong Ho +2 more