Abstract
This letter considers simultaneous wireless information and power transfer (SWIPT) in multiple-input single-output (MISO) multicasting systems where each receiver is equipped with a power splitting device and can receive both information and energy from the base station (BS) continuously at the same time. We investigate the joint multicast transmit beamforming and receive power splitting problem for minimizing the transmit power of the BS subject to signal-to-noise ratio (SNR) and energy harvesting constraints at each receiver. Both scenarios of perfect and imperfect channel state information (CSI) at the BS are studied. Due to non convexity of the problems, we use semidefinite relaxation (SDR) technique to solve the problems. Interestingly, we show that the SDR is in fact tight in certain scenarios.
Highlights
S INCE signals that carry energy can transport information at the same time, simultaneous wireless information and power transfer (SWIPT) has become an interesting new area of research and drawn upsurge of interest [1]–[5]
The concept of SWIPT was first introduced in [1], in which the fundamental tradeoffs between the rates at which energy and reliable information can be transmitted over a single noisy power splitting is considered
We develop a robust algorithm for joint beamforming and PS ratio optimization in the case of erroneous channel state information (CSI) which uses the concept of worst-case design
Summary
S INCE signals that carry energy can transport information at the same time, simultaneous wireless information and power transfer (SWIPT) has become an interesting new area of research and drawn upsurge of interest [1]–[5]. Our aim is to minimize the BS transmit power while maintaining the signal-to-noise ratio (SNR) and energy harvesting thresholds at each MS, by jointly optimizing the beamforming vector at the BS and the MS power splitting parameters Both perfect and imperfect CSI cases at the BS are considered and the problems are addressed using semidefinite relaxation (SDR) techniques. The work in [1] was later extended to frequency-selective channels in [2] It was assumed in [1], [2] that the receiver is able to decode information and extract power simultaneously from the same received signal, which is not quite the case in practical designs. The scenario in [3] was broadcasting from a base station (BS) to two receivers taking turns for information decoding and energy harvesting
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