Optimal SWIPT in RIS-Aided MIMO Networks

Yang, Ziyi; Zhang, Yu

doi:10.1109/access.2021.3099698

Cited by 13 publications

(5 citation statements)

References 25 publications

(26 reference statements)

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“…In further developments, RISs have been combined with SWIPT to drastically improve the spectral efficiency and energy efficiency for 5G/future 6G networks [24]. In general, the performance in terms of reception reliability can be evaluated by the achievable information rates.…”

Section: A Related Workmentioning

confidence: 99%

Rate-Energy Tradeoff Analysis in RIS-SWIPT Systems With Hardware Impairments and Phase-Based Amplitude Response

Khalid

Cho

et al. 2022

IEEE Access

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This paper investigates the reconfigurable intelligent surface (RIS)-empowered dynamic power splitting designs for simultaneous wireless information and power transfer (SWIPT) systems while adopting various practical hardware issues. Specifically, we adopt the physical size of the RIS and the placement of the RIS plane to phase-align the reflected signals towards the desired direction. The analytical phase shift model for the reflecting elements is presented to characterize an intertwined relationship between amplitude and phase responses, which captures the amplitude variations depending on phase in RIS elements. Furthermore, an additive distortion noise incorporates the residual transceiver hardware impairments (RTHIs). The stringent signal-to-interference-plus-noise ratio requirement is facilitated using both the direct and indirect, i.e., RIS cascaded, links. To made complicated analysis become tractable, we exploit the statistical properties of the effective channel power which follows a Gamma distribution. The tight bounds for the achievable rates and residual energy are derived and the tradeoffs between the achievable rate and residual energy for the time switching and static power splitting designs are characterized. Finally, the numerical results confirm the accuracy of the developed framework and demonstrate the selection of the system parameters.INDEX TERMS RIS, SWIPT, RTHIs, phase-dependent amplitude response, rate-residual energy tradeoffs.

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Section: A Related Workmentioning

confidence: 99%

Rate-Energy Tradeoff Analysis in RIS-SWIPT Systems With Hardware Impairments and Phase-Based Amplitude Response

Khalid

Cho

et al. 2022

IEEE Access

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“…Combining ( 22), (34), and (35), the BER for the information demodulation during demodulation can be yielded as…”

Section: B Ber Analysismentioning

confidence: 99%

“…To be specific, when the distance between the transmitter and receiver is relatively large, the efficiency of wireless power transfer will be dramatically reduced by the large-scale path loss. To overcome the above weekness, the integration of SWIPT technique with emerging communication technologies, such as reconfigurable intelligent surface (RIS), has been explored [34].…”

Section: Introductionmentioning

confidence: 99%

Design of a Reconfigurable Intelligent Surface-Assisted FM-DCSK-SWIPT Scheme with Non-linear Energy Harvesting Model

Fang¹,

Tao²,

Ma³

et al. 2022

Preprint

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In this paper, we propose a reconfigurable intelligent surface (RIS)-assisted frequency-modulated (FM) differential chaos shift keying (DCSK) scheme with simultaneous wireless information and power transfer (SWIPT), called RIS-FM-DCSK-SWIPT scheme, for low-power, low-cost, and high-reliability wireless communication networks. In particular, the proposed scheme is developed under a non-linear energy-harvesting (EH) model which can accurately characterize the practical situation. The proposed RIS-FM-DCSK-SWIPT scheme has an appealing feature that it does not require channel state information, thus avoiding the complex channel estimation. We derive the theoretical expressions for the energy shortage probability and bit error rate (BER) of the proposed scheme over the multipath Rayleigh fading channel. We investigate the influence of key parameters on the performance of the proposed scheme in two different scenarios, i.e., RIS-assisted access point (RIS-AP) and dual-hop communication (RIS-DH). Finally, we carry out various Monte-Carlo experiments to verify the accuracy of the theoretical derivation, and illustrate the performance advantage of the proposed scheme over the existing DCSK-SWIPT schemes.Index terms-Reconfigurable intelligent surface, differential chaos shift keying, simultaneous wireless information and power transfer, non-linear energy-harvesting, multipath Rayleigh fading channel.

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“…The authors of [10] investigated a passive RISaided SWIPT system and showed that the passive RIS can enhance the data rates at the information receivers (IRs), while ensuring the minimum power requirements of the received power at the energy receivers (ERs). In [11], the authors studied an optimization problem of maximizing the minimum rate of the IRs in the passive RIS-aided SWIPT system with imperfect channel state information (CSI). And the authors of [12] aimed to maximize the data rate by proposing a joint time-switching and phase-shifting solution for passive RIS-assisted SWIPT communications.…”

Section: Introductionmentioning

confidence: 99%

Transmission Design for Active RIS-Aided Simultaneous Wireless Information and Power Transfer

Ren

Chen

et al. 2023

IEEE Wireless Commun. Lett.

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Reconfigurable intelligent surface (RIS) is a revolutionary technology to enhance both the spectral efficiency and energy efficiency of wireless communication systems. However, most of the existing contributions mainly focused on the study of passive RIS, which suffers from the "double fading" effect. On the other hand, active RIS, which is equipped with amplifiers, can effectively address this issue. In this paper, we propose an active RIS-aided simultaneous wireless information and power transfer (SWIPT) system. Specifically, we maximize the weighted sum rate of the information receivers, subject to the minimum power received at all energy receivers, amplification power constraint at the active RIS, and the maximum transmit power constraint at the base station (BS). By adopting alternating optimization framework, suboptimal solutions are obtained. Simulation results show that the active RIS-aided SWIPT system has higher performance gain with the same power budget.Index Terms-Reconfigurable intelligent surface (RIS), active RIS, wireless information and power transfer (SWIPT).

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Optimal SWIPT in RIS-Aided MIMO Networks

Cited by 13 publications

References 25 publications

Rate-Energy Tradeoff Analysis in RIS-SWIPT Systems With Hardware Impairments and Phase-Based Amplitude Response

Rate-Energy Tradeoff Analysis in RIS-SWIPT Systems With Hardware Impairments and Phase-Based Amplitude Response

Design of a Reconfigurable Intelligent Surface-Assisted FM-DCSK-SWIPT Scheme with Non-linear Energy Harvesting Model

Transmission Design for Active RIS-Aided Simultaneous Wireless Information and Power Transfer

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