Information and Energy Beamforming in MIMO Wireless Powered Systems

Almradi, Ahmed

doi:10.1109/glocom.2016.7841902

Cited by 6 publications

(12 citation statements)

References 14 publications

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“…Before proceeding to the main issue of imperfect CSI, we briefly review a few works on WPCNs with perfect CSI [9], [10], [12]- [14]. The key paper, which is the starting point of our work, is [9].…”

Section: B Performance With Perfect Csimentioning

confidence: 99%

“…In [15], the energy efficiency is maximized by jointly optimizing energy transfer time duration and transmit power. The average throughput of a multiple-input multiple-output (MIMO) WPCN has been studied in [14]. All these works assume the availability of perfect CSI, which is the critical difference from our paper.…”

Section: B Performance With Perfect Csimentioning

confidence: 99%

“…We next note that (14) has the series sum over n and m. If we expand the series over different n values, when γ → ∞, the integrals for which n ≥ 2 can be negligible compared to the one for n = 1. For this reason, (14) can be fairly accurately approximated as follows:…”

Section: B Moments-generating Functionmentioning

confidence: 99%

“…where Proof. For the imperfect CSI case, when 0 ≤ ρ < 1, in (14), the dominant part is the one with n = 1 and m = 1. Therefore, we can consider just that term of (14) as…”

Section: B Moments-generating Functionmentioning

confidence: 99%

“…On the other hand, [14] investigates a MIMO WPCN system with perfect CSI. The SNR in [14,Eq. (8)] is a product of two independent Chi-square variables.…”

Section: A Delay-limited Transmission Mode 1) Exact Throughput Analysismentioning

confidence: 99%

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Performance Analysis of Energy Beamforming WPCN Links With Channel Estimation Errors

Wang

Tellambura

2020

IEEE Open J. Commun. Soc.

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In this paper, we analyze the performance of a wireless-powered communication network that consists of a multiple-antenna hybrid access point (AP) and a single-antenna user. The AP transmits radio frequency (RF) power in the downlink (DL) using maximal ratio transmission (MRT) type energy beamforming. The user harvests it and transmits data to the AP in the uplink (UL), which is received with maximal ratio combining (MRC). Previous analyses have assumed the availability of perfect channel estimation. In contrast, we eliminate this unrealistic assumption and consider the effect of imperfect channel estimates. We first derive the distributions of the received AP signal-to-noise ratio (SNR). We then analyze the average throughput performance of delay-limited and delay-tolerant modes by evaluating the outage probability (OP) and ergodic capacity (EC). We also derive the exact bit error rates (BERs) and symbol error rates (SERs) of several digital modulations. Asymptotic performance expressions in the high SNR regime and the large antenna regime are also developed. Finally, analytical and asymptotic results are validated by Monte-Carlo simulations. The impacts of the transmit power, the energy harvesting (EH) time, the number of antennas and the efficiency of EH are investigated.

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Section: B Performance With Perfect Csimentioning

confidence: 99%

Section: B Performance With Perfect Csimentioning

confidence: 99%

Section: B Moments-generating Functionmentioning

confidence: 99%

“…where Proof. For the imperfect CSI case, when 0 ≤ ρ < 1, in (14), the dominant part is the one with n = 1 and m = 1. Therefore, we can consider just that term of (14) as…”

Section: B Moments-generating Functionmentioning

confidence: 99%

“…On the other hand, [14] investigates a MIMO WPCN system with perfect CSI. The SNR in [14,Eq. (8)] is a product of two independent Chi-square variables.…”

Section: A Delay-limited Transmission Mode 1) Exact Throughput Analysismentioning

confidence: 99%

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Performance Analysis of Energy Beamforming WPCN Links With Channel Estimation Errors

Wang

Tellambura

2020

IEEE Open J. Commun. Soc.

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Game-Theory-Based Distributed Power Splitting for Future Wireless Powered MTC Networks

Kang

Pan

et al. 2017

IEEE Access

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Effect of Downlink Energy Transfer Scheduling on SDMA and TDMA Uplink Transmission

Pehlivan

Coleri

2021

2021 IEEE International Black Sea Conference on Communications and Networking (BlackSeaCom)

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The high cost and power consumption of digital beamforming, as a result of the high number of RF chains, has overshadowed its performance on multi-antenna wireless powered communication networks (WPCNs). This setback forced researchers to low-cost alternatives such as hybrid beamforming, which decreases the number of expensive RF chains by utilizing cheaper phase shifters. This cost-cutting, however, comes with reduced control over beamforming weights and compromise performance. To circumvent this deficiency, scheduling of energy harvesting (SEH), utilizing the degree of freedom in the time domain, has been proposed. In SEH, the downlink slot is subdivided into multiple variable-length subslots with different beamforming weights. In this paper, we examine the effect of SEH on the optimization of minimum length scheduling for space division multiple access (SDMA) uplink transmission compared to time division multiple access (TDMA) uplink transmission. Via simulations, we demonstrate that SDMA benefits more from the additional degree of freedom provided by the usage of SEH for any number of nodes. However, SDMA yields inferior delay performance compared to TDMA as the number of nodes increases, which restricts the application of SDMA with SEH, making it impractical.

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Information and Energy Beamforming in MIMO Wireless Powered Systems

Cited by 6 publications

References 14 publications

Performance Analysis of Energy Beamforming WPCN Links With Channel Estimation Errors

Performance Analysis of Energy Beamforming WPCN Links With Channel Estimation Errors

Game-Theory-Based Distributed Power Splitting for Future Wireless Powered MTC Networks

Effect of Downlink Energy Transfer Scheduling on SDMA and TDMA Uplink Transmission

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