Wireless Information and Power Transfer in Multiuser OFDM Systems

By Xun Zhou, Rui Zhang, Chin Keong Ho. IEEE Transactions on Wireless Communications, 2013

315 citations recorded by the source corpus.

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.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/7a7b64d346ea76d6331494736390ec3969dd5c90

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In Electrical and Electronic Engineering

1. Rui Zhang
2. Robert Schober
3. H. Vincent Poor
4. Dong In Kim
5. Dusist Niyato
6. Bruno Clerckx
7. Suzhi Bi
8. Zhu Han

Citations in the corpus

• Wireless powered communication: opportunities and challenges (2014, background): “In general, the optimal value τ 0 that results in the highest UL throughput is related to the users’ wireless channel conditions.”
• Wireless Networks With RF Energy Harvesting: A Contemporary Survey (2014, background): “The investigation in [166] considers receiver operation problems in multiple access channels with TDMA and OFDMA.”
• Optimal Resource Allocation in Full-Duplex Wireless-Powered Communication Network (2014, methodology): “, the point-to-point additive white Gaussian noise (AWGN) channel [3], [4], the fading AWGN channel [5], [6] the multi-antenna channel [7]–[9], the relay channel [10], [11], and the multi-carrier based broadcast channel [12]–[14].”
• Fundamentals of Wireless Information and Power Transfer: From RF Energy Harvester Models to Signal and System Designs (2018, methodology): “Further, an OFDM-based multi-user broadcast SWIPT system is considered in [33], in which the subchannel allocation, as well as the transmit power and receive PS ratio at each subchannel are jointly optimized to achieve the best R-E tradeoff.”
• Simultaneous Wireless Information and Power Transfer (SWIPT): Recent Advances and Future Challenges (2018, background): “Several existing papers have studied the performance of OFDM-based SWIPT systems [60], [64], [66], [86].”
• Joint Transmit Beamforming and Receive Power Splitting for MISO SWIPT Systems (2013, background): “Furthermore, SWIPT has been investigated in other channel setups such as relay channels [13]–[16] and OFDM channels [17], [18].”
• Throughput Optimization for Massive MIMO Systems Powered by Wireless Energy Transfer (2014, background): “SWIPT has also been studied in fading channels [6], orthogonal frequency division multiplexing (OFDM) systems [7]–[10], and multiuser channel setups such as broadcast channels [11], [12], relay channels [13], [14], and interference channels [15], [16].”