Beamforming Design in SWIPT-Based Joint Multicast-Unicast mmWave Massive MIMO With Lens-Antenna Array

Abstract

In this letter, we study the beamforming design in a lens-antenna array-based joint multicast-unicast millimeter wave massive MIMO system, where the simultaneous wireless information and power transfer at users is considered. First, we develop a beam selection scheme based on the structure of the lens-antenna array and then, the zero forcing precoding is adopted to cancel the inter-unicast interference among users. Next, we formulate a sum rate maximization problem by jointly optimizing the unicast power, multicast beamforming and power splitting ratio. Meanwhile, the maximum transmit power constraint for the base station and the minimum harvested energy for each user are imposed. By employing the successive convex approximation technique, we transform the original optimization problem into a convex one, and propose an iterative algorithm to solve it. Finally, simulation results are conducted to verify the effectiveness of the proposed schemes.

Statistical QoS Aware for Wireless Powered Cooperative Communications in Internet of Things

“…Then, substituting it to A 1 (µ) and A 2 (µ) in Eq. (17) and setting A 1 (µ) = A 2 (µ), we can obtain ρ * h in Theorem 1. γ th1 is the SNR threshold. Then, we plug Eq.…”

“…Wireless power transfer tech-nology has drawn variety of significant research attentions, and has been integrated in various wireless communications such as cognitive radio networks [13], [14], wireless sensor networks [15], and mobile edge computing networks [16] and so on. As a wireless power transfer technology, Simultaneous Wireless Information and Power Transfer (SWIPT), enabling simultaneously wireless information decoding and RF energy harvesting, which can potentially prolong the life time of wireless devices to circumvent interruption of the data transmission [17]. To achieve simultaneously information and wireless power transfer, two energy harvesting policies have been introduced: Power Switching (PS) [18] and Time Switching (TS) [19].…”

Joint Beamforming and Power Splitting Design for C-RAN With Multicast Fronthaul

“…where B mc denotes the microwave bandwidth. The multicast rate of the lth cluster is decided by the BS with the worst channel condition, and thus the fronthaul multicast rate provided by the CP for the lth cluster is given [13]…”

“…Now, the only obstacle is the rank-one constraint (10i). By SDP relaxation, i.e., removing (10i), we can obtain the following convex relaxed SDP optimization problem (13), (14), (15e), (16), (17), (18), (20), (21a), (21c), (22).…”

“…The authors in [12] consider a transmit power minimization problem in a full duplex C-RAN, and four approaches of jointly optimizing beamformers, uplink transmit power and receiver power ratios are proposed. The authors in [13] study the min max fronthaul load optimization problem for an energy harvesting powered C-RAN with QoS and harvested energy constraints, and propose an effective beamforming algorithm to solve it. In [14], the authors investigate SWIPT problem in an uplink C-RAN, and the minimum mean-square-error is considered by optimizing precoders and detectors.…”