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659 results on '"Jiangzhou Wang"'

79. Pricing-based Distributed Energy-Efficient Beamforming for MISO Interference Channels

Author

Cunhua, Pan, Wei, Xu, Jiangzhou, Wang, Hong, Ren, Wence, Zhang, Nuo, Huang, and Ming, Chen

Subjects
Computer Science - Information Theory
Abstract

In this paper, we consider the problem of maximizing the weighted sum energy efficiency (WS-EE) for multi-input single-output (MISO) interference channels (ICs) which is well acknowledged as general models of heterogeneous networks (HetNets), multicell networks, etc. To address this problem, we develop an efficient distributed beamforming algorithm based on a pricing mechanism. Specifically, we carefully introduce a price metric for distributed beamforming design which fortunately allows efficient closed-form solutions to the per-user beam-vector optimization problem. The convergence of the distributed pricing-based beamforming design is theoretically proven. Furthermore, we present an implementation strategy of the proposed distributed algorithm with limited information exchange. Numerical results show that our algorithm converges much faster than existing algorithms, while yielding comparable, sometimes even better performance in terms of the WS-EE. Finally, by taking the backhaul power consumption into account, it is interesting to show that the proposed algorithm with limited information exchange achieves better WS-EE than the full information exchange based algorithm in some special cases., Comment: 40 pages

Published
2015

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

Author

Hong Ren, Zhiwei Chen, Guosheng Hu, Zhangjie Peng, Cunhua Pan, and Jiangzhou Wang

Subjects
FOS: Computer and information sciences, Control and Systems Engineering, Information Theory (cs.IT), Computer Science - Information Theory, Electrical and Electronic Engineering
Abstract

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., Accepted by IEEE Wireless Communications Letters. Keywords: Reconfigurable intelligent surface (RIS), active RIS, wireless information and power transfer (SWIPT)

Published
2023

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