报告题目: Wireless Powered Buffer-aided Communication Networks

报告摘要: Wireless powered communication networks provides us an efficient method to fulfill the energy sustainable wireless communications. In this talk, we will show our recent works on wireless powered buffer-aided two-way wireless energy harvesting (EH) relay network comprising two users and one relay, where two users exchange information with the help of the relay via three phases of EH, multiple-access, and broadcast. By transforming the opportunistic scheduling design problem into an equivalent convex problem, we present the adaptive design for the buffer-aided two-way EH relay network to maximize the long-term achievable rate region. To fulfill the delay sensitive transmission requirements, a delay-aware adaptive transmission (DAAT) scheduling scheme is proposed to guarantee the average end-to-end delivery delay by employing the Lyapunov optimization framework. Our analysis discloses that the average achievable rate region of the two-way wireless EH relay network can be improved when fully considering the potentials by deploying data buffer and energy storage at the relay. There exists an inherent tradeoff among the achievable sum rate, the delivery delay, and the power consumption. It is shown that, when a certain time delay is tolerable, the DAAT scheduling scheme is able to realize a rate region arbitrarily close to the achievable rate region of the buffer-aided two-way wireless EH relay network.

报告人：陈庆春教授、博导、学科带头人

报告时间：2018年10月24日上午9:00

报告地点： 理6-525

邀请人：张涵教授 穆丽伟副教授

报告题目: UAV-Enabled Wireless Powered Communication Networks: Joint Trajectory and Wireless Resource Allocations

报告摘要: This talk focuses on a new unmanned aerial vehicle (UAV)-enabled wireless powered communication network (WPCN), in which a UAV is dispatched as a mobile access point (AP) to serve a set of ground users periodically. The UAV employs the radio frequency (RF) wireless power transfer (WPT) to charge the users in the downlink, and the users use the harvested RF energy to send independent information to the UAV in the uplink. Unlike the conventional WPCN with fixed APs, the UAV-enabled WPCN can exploit the mobility of the UAV via trajectory design, jointly with the wireless resource allocation optimization, to maximize the system throughput. In particular, we aim to maximize the uplink common (minimum) throughput among all ground users over a finite UAV’s flight period, subject to its maximum speed constraint and the users’ energy neutrality constraints. The resulted problem is non-convex and thus difficult to be solved optimally. To tackle this challenge, we first consider an ideal case without the UAV’s maximum speed constraint, and obtain the optimal solution to the relaxed problem. The optimal solution shows that the UAV should successively hover above a finite number of ground locations for downlink WPT, as well as above each of the ground users for uplink communication. Next, we consider the general problem with the UAV’s maximum speed constraint. Based on the above multi-location-hovering solution, we first propose an efficient successive hover-and-fly trajectory design, jointly with the downlink and uplink wireless resource allocation, and then propose a locally optimal solution by applying the techniques of alternating optimization and successive convex programming (SCP). Numerical results show that the proposed UAV-enabled WPCN achieves significant throughput gains over the conventional WPCN with fixed-location AP.

报告人：许杰教授、博导

报告时间：2018年10月24日上午10：00

报告地点： 理6-525

邀请人：张涵教授 穆丽伟副教授

报告题目: 空间物联网-从小尺度到中尺度网络的演进

报告摘要: 如果仅仅依赖于建在地面上的网络基站，目前所说的物联网只能算是陆地上小范围发达地区的科技。而像一带一路、重大工程、大湾区的建设等所涵盖的高含金量贸易区来说，却都是地基物联网无法触及的领域。要解决这一问题，就要依靠基于空间传输网络的空间物联网加以解决。本次汇报将从面临的挑战、空间物联网的体系结构设计、传输技术的突破以及基础理论的研究上对相关方向加以阐明。

报告人：张钦宇教授、博导、国家杰出青年基金获得者、国家973计划首席科学家、国家重点研发计划项目首席科学家、 哈尔滨工业大学深圳研究生院电子与信息工程学院经理

报告时间：2018年10月24日上午11:00

报告地点： 理6-525

邀请人：张涵教授 穆丽伟副教授