Joint Wireless Information and Energy Transfer with Reduced Feedback in MIMO Interference Channels

Abstract

Abstract-To determine the transmission strategy for the joint wireless information and energy transfer (JWIET) in the MIMO interference channel (IFC), the information access point (IAP) and energy access point (EAP) require the channel state information (CSI) of their associated links to both the information-decoding (ID) mobile stations (MSs) and energyharvesting (EH) MSs (so-called local CSI). In this paper, to reduce the feedback overhead of MSs for the JWIET in twouser MIMO IFC, we propose a Geodesic energy beamforming scheme that requires partial CSI at the EAP. Furthermore, in the two-user MIMO IFC, it is proved that the Geodesic energy beamforming is the optimal non-cooperative strategy under local CSIT assumption. By adding a rank-one constraint on the transmit signal covariance of IAP, we can further reduce the feedback overhead to IAP by exploiting Geodesic information beamforming. Under the rank-one constraint of IAP's transmit signal, we prove that Geodesic information/energy beamforming approach is the optimal non-cooperative strategy for JWIET in the two-user MIMO IFC. We also discuss the extension of the proposed rank-one Geodesic information/energy beamforming strategies to general K-user MIMO IFC. Finally, by analyzing the achievable rate-energy performance statistically under imperfect partial CSIT, we propose an adaptive bit allocation strategy for both EH MS and ID MS.Index Terms-Joint wireless information and energy transfer, MIMO interference channel, Geodesic beamforming, Limited feedback

Wireless Information and Power Transfer: Nonlinearity, Waveform Design, and Rate-Energy Tradeoff

“…WIPT was then studied in a frequency-selective AWGN channel under an average power constraint [3]. Since then, WIPT has attracted significant interests in the communication literature with among others MIMO broadcasting [4]- [6], architecture [7], interference channel [8]- [10], broadband Bruno Clerckx is with the EEE department at Imperial College London, London SW7 2AZ, UK (email: b.clerckx@imperial.ac.uk). This work has been partially supported by the EPSRC of UK, under grant EP/P003885/1.…”

Throughput Maximization and Fairness Assurance in Data and Energy Integrated Communication Networks

“…• Channel Estimation: the channel state information (CSI) can be acquired by the BS via the forward-link training together with the reverse-link feedback [23]. The channel states are assumed unchanged during a single operating cycle but they vary from one operating cycle to another.…”

Simultaneous Wireless Information and Power Transfer in a two-user OFDM Interference Channel

“…SWIPT in a two-user and K-user MIMO system have been considered in [1] and [2], respectively. [3] has considered SWIPT with partial CSI at the transmitter in MIMO IFC. SWIPT in a multi-user MISO IFC has been discussed in [4].…”

“…In this paper, we leverage our past results on SWIPT in MIMO IFC [1]- [3] to address SWIPT in SISO-OFDM IFC. To the best of the authors' knowledge, SWIPT for an OFDM interference channel has not been addressed yet.…”

“…However, the rank one beamforming of the MIMO system is in a continuous space domain while the subcarrier transmission strategy in the OFDM system is in a discrete frequency domain. This results in the selection of the optimal subcarrier and the computation of the achievable rate-energy (R-E) region being simpler than the design of the Geodesic beamformer and computation of the R-E region in MIMO [3].…”