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Joint Active and Passive Beamforming for IRS-Aided Wireless Energy Transfer Network Exploiting One-Bit Feedback

Published 8 Apr 2024 in eess.SY and cs.SY | (2404.05418v1)

Abstract: To reap the active and passive beamforming gain in an intelligent reflecting surface (IRS)-aided wireless network, a typical way is to first acquire the channel state information (CSI) relying on the pilot signal, and then perform the joint beamforming design. However, it is a great challenge when the receiver can neither send pilot signals nor have complex signal processing capabilities due to its hardware limitation. To tackle this problem, we study in this paper an IRS-aided wireless energy transfer (WET) network and propose two joint beamforming design methods, namely, the channel-estimationbased method and the distributed-beamforming-based method, that require only one-bit feedback from the energy receiver (ER) to the energy transmitter (ET). Specifically, for the channelestimation-based method, according to the feedback information, the ET is able to infer the cascaded ET-IRS-ER channel by continually adjusting its transmit beamformer while applying the analytic center cutting plane method (ACCPM). Then, based on the estimated cascaded CSI, the joint beamforming design can be performed by using the existing optimization techniques. While for the distributed-beamforming-based method, we first apply the distributed beamforming algorithm to optimize the IRS reflection coefficients, which is theoretically proven to converge to a local optimum almost surely. Then, the optimal ET's transmit covariance matrix is obtained based on the effective ET-ER channel learned by applying the ACCPM only once. Numerical results demonstrate the effectiveness of our proposed one-bitfeedback-based joint beamforming design schemes while greatly reducing the requirement on the hardware complexity of the ER. In particular, the high accuracy of our IRS-involved cascaded channel estimation method exploiting one-bit feedback is also validated.

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