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RIS-Aided Constant-Envelope Beamforming for Multiuser Wireless Power Transfer:A max-min Approach

China Communications 2021年第3期18卷 80-90页

作者： Huiyuan Yang Chang Cai Xiaojun Yuan Yingchang Liang Center for Intelligent Networking and Communications University of Electronic Science and Technology of ChinaChengdu 611731China

As a revolutionary hardware technology that can reconfigure the propagation environment,reconfigurable intelligent surfaces(RISs)have been regarded as a promising solution to enhance wireless *** this paper,we consider a multiuser multiple-input single-output(MISO)wireless power transfer(WPT)system,which is assisted by several *** order to improve energy efficiency and reduce hardware cost,we consider that the energy transmitter(ET)in the WPT system is equipped with a constant-envelope analog beamformer,instead of a digital *** on user fairness,we study a minimum received power maximization problem by jointly optimizing the ET beamforming and the RIS phase shifts,subject to the constant-envelope *** iteratively solve this non-convex maxmin problem by leveraging both the successive convex approximation(SCA)method and the alternating direction method of multipliers(ADMM)*** results demonstrate the effectiveness of the proposed algorithm and show attractive performance gain brought by RISs.

关键词： reconfigurable intelligent surface wireless power transfer max-min fairness constantenvelope beamforming

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fairness-Oriented Hybrid Precoding for Massive MIMO Maritime Downlink Systems with Large-Scale CSIT

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China Communications 2018年第1期15卷 52-61页

作者： Chengxiao Liu Wei Feng Te Wei Ning Ge Tsinghua National Laboratory for Information Science and Technology Tsinghua University

Different from conventional cellular networks, a maritime communication base station(BS) has to cover a much wider area due to the limitation of available BS sites. Accordingly the performance of users far away from the BS is poor in general. This renders the fairness among users a challenging issue for maritime communications. In this paper, we consider a practical massive MIMO maritime BS with hybrid digital and analog precoding. Only the large-scale channel state information at the transmitter(CSIT) is considered so as to reduce the implementation complexity and overhead of the system. On this basis, we address the problem of fairness-oriented precoding design. A max-min optimization problem is formulated and solved in an iterative way. Simulation results demonstrate that the proposed scheme performs much better than conventional hybrid precoding algorithms in terms of minimum achievable rate of all the users, for the typical three-ray maritime channel model.

关键词： maritime communication massive MIMO hybrid precoding large-scale channel state information at the transmitter(CSIT) max-min fairness

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Optimal power allocation for downlink two-user non-orthogonal multiple access in visible light communication

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Journal of Communications and Information Networks 2017年第4期2卷 57-64页

作者： Hong Shen Yanfei Wu Wei Xu Chunming Zhao National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China

In this work,we consider employing the NOMA(Non-Orthogonal Multiple Access)technique in downlink VLC(Visible Light Communication)for performance *** particular,focusing on a typical NOMA scenario with two users,we optimize the power allocation strategies under both sum-rate maximization and max-min fairness criteria,where practical optical power and QoS(Quality of Service)constraints are *** our main contribution,we achieve optimal power allocation solutions in semi-closed forms via mathematical analysis,which,to the best of our knowledge,have not been reported in *** results demonstrate that NOMA can provide remarkable performance gains over OMA(Orthogonal Multiple Access)in the context of VLC downlinks.

关键词： NOMA VLC power allocation sum-rate maximization max-min fairness

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fairness for Extend DCCP Congestion Control in Wireless Sensor Networks

Fairness for Extend DCCP Congestion Control in Wireless Sens...

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2009中国控制与决策会议

作者： LIU Yong-min ~(1,2),JIANG Xin-Hua~2,NIAN Xiao-Hong ~2 1.College of Vocational Technology,Central South University of Forestry and Technology,Changsha 410004,China 2.School of Information Science and Engineering,Central South University,Changsha 410075,China

＜正＞This TCP is primarily designed for wired networks and became very efficient and robust with years of ***,experiments and research showed that TCP’s congestion control algorithm performs very poorly over Wireless Sensor Networks（WSN） with severe unfairness among *** the deployment of a sensor network causes unpredictable patterns of connectivity and varied node density,resulting in uneven bandwidth provisioning on the forwarding *** paper studies TCP’s fairness issues in WSNs,and designs an Extended congestion control algorithm based on the characteristics of the *** protocol is designed as extension to DCCP （Datagram Congestion Control Protocol） with a new congestion control *** also implemented this congestion control algorithm in *** results show improvements on fairness achieved by using Extend congestion control algorithm.

关键词： max-min fairness Datagram Congestion Control Protocol congestion control wireless sensor networks

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