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| 1 | Resource optimization in wireless powered cooperative mobile edge computing systems显示文摘Mobile edge computing(MEC)meets the high-bandwidth and ultra-low-latency requirements of mobile networks and improves communication reliability by reducing the networks’load.In this study,we study a wireless powered MEC system,which includes an access point(AP)and two mobile devices.The endurance of mobile devices can be effectively enhanced using the wireless power transfer technology and user cooperation.However,during user cooperation,a closer user assists a farther user with forwarding tasks by sharing the same bandwidth,which causes interference.To overcome the interference issue,the closer user can instead assist other users in forwarding tasks by using a different bandwidth.We aim to minimize the power of the AP by joint power and bandwidth optimization while satisfying the delay and users’computational tasks.Simulation results show that the proposed user collaboration method can overcome user interference,reduce energy consumption,and improve user performance compared with the baseline policies. | Qibin YE Weidang LU Su HU Xiaohan XU | 2021 | Science China(Information Sciences)2021，64，8： | 3 |
| 2 | Green UAV communications for 6G: A survey显示文摘Unmanned Aerial Vehicles(UAVs) have received a wide range of attention for military and commercial applications. Enhanced with communication capability, UAVs are considered to play important roles in the Sixth Generation(6G) networks due to their low cost and flexible deployment. 6G is supposed to be an all-coverage network to provide ubiquitous connections for space, air, ground and underwater. UAVs are able to provide air-borne wireless coverage flexibly,serving as aerial base stations for ground users, as relays to connect isolated nodes, or as mobile users in cellular networks. However, the onboard energy of small UAVs is extremely limited. Thus,UAVs can be only deployed to establish wireless links temporarily. Prolonging the lifetime and developing green UAV communication with low power consumption becomes a critical challenge.In this article, a comprehensive survey on green UAV communications for 6G is carried out. Specifically, the typical UAVs and their energy consumption models are introduced. Then, the typical trends of green UAV communications are provided. In addition, the typical applications of UAVs and their green designs are discussed. Finally, several promising techniques and open research issues are also pointed out. | Xu JIANG Min SHENG Nan ZHAO Chengwen XING Weidang LU Xianbin WANG | 2022 | Chinese Journal of Aeronautics2022，35，9： | 3 |
| 3 | Sensing Time Optimization in Energy-Harvesting Cognitive Radio with Interference Rate Control显示文摘In this paper,an energy-harvesting cognitive radio(CR) is considered,which allows the transmitter of the secondary user(SU) to harvest the primary signal energy from the transmitter of the primary user(PU) when the presence of the PU is detected.Then the harvested energy is converted into the electrical power to supply the transmission of the SU at the detected absence of the PU.By adopting the periodic spectrum sensing,the average total transmission rate of the SU is maximized through optimizing the sensing time,subject to the constraints of the probabilities of false alarm and detection,the harvested energy and the interference rate control.The simulation results show that there deed exists an optimal sensing time that maximizes the transmission rate,and the maximum transmission rate of the energy-harvesting CR can better approach to that of the traditional CR with the increasing of the detection probability. | DENG Zhian LIU Xin JIA Min LU Weidang | 2016 | China Communications2016，13，1： | 3 |
| 4 | Resource and trajectory optimization in UAV-powered wireless communication system显示文摘The unmanned aerial vehicle(UAV) is a promising enabler of Internet of Things(IoT) owing to its highly flexible features. Combined with wireless power transfer(WPT) techniques, a UAV can provide energy for IoT nodes, which can extend the lifetime of energy constrained communication systems. This paper studies resource and trajectory optimization in UAV-powered wireless communication systems, which consists of two UAVs and two ground nodes(GNs). The system works in a way that the two UAVs alternately charge the two GNs through wireless power transfer and two GNs also alternately send their information to the corresponding UAV with the harvested energy, which can effectively reduce the interference while receiving the information of GNs. Aiming to maximize the minimum throughput of two GNs, wireless resource and UAVs’ trajectories are jointly optimized with the constraints of UAV collision avoidance, flying speed, and transmit power. Successive convex programming(SCP) and block coordinate descent(BCD) are utilized to solve the optimization problem. Simulation results show that the proposed scheme achieves larger minimum throughput than the benchmark scheme. | Weidang LU Peiyuan SI Fangwei LU Bo LI Zilong LIU Su HU Yi GONG | 2021 | Science China(Information Sciences)2021，64，4： | 2 |
| 5 | OFDM Based Bidirectional Multi-Relay SWIPT Strategy for 6G IoT Networks显示文摘6G IoT networks aim for providing significantly higher data rates and extremely lower latency.However,due to the increasingly scarce spectrum bands and ever-growing massive number IoT devices(IoDs)deployed,6G IoT networks face two critical challenges,i.e.,energy limitation and severe signal attenuation.Simultaneous wireless information and power transfer(SWIPT)and cooperative relaying provide effective ways to address these two challenges.In this paper,we investigate the energy self-sustainability(ESS)of 6G IoT network and propose an OFDM based bidirectional multi-relay SWIPT strategy for 6G IoT networks.In the proposed strategy,the transmission process is equally divided into two phases.Specifically,in phase1 two source nodes transmit their signals to relay nodes which will then use different subcarrier sets to decode information and harvest energy,respectively.In phase2 relay nodes forward signals to corresponding destination nodes with the harvested energy.We maximize the weighted sum transmission rate by optimizing subcarriers and power allocation.Our proposed strategy achieves larger weighted sum transmission rate comparing with the benchmark scheme. | Weidang Lu Peiyuan Si Xin Liu Bo Li Zilong Liu Nan Zhao Yuan Wu | 2020 | China Communications2020，17，12： | 1 |
| 6 | Geometry-based non-line-of-sight error mitigation and localization in wireless communications显示文摘Recently, positioning services have received considerable attention. The primary source of the positioning error is non-line-of-sight(NLOS) propagation. To address this problem, we propose a novel NLOS mitigation scheme, in which the geometric relationship between a base station and a mobile station is used.This makes it possible to identify range measurements corrupted by NLOS errors, and the mobile station can then estimate its position through line-of-sight(LOS) measurements. Moreover, the threshold of the NLOS detector is derived via a hybrid method using both the analytical derivation and computer simulation, which significantly reduces the difficulty of identifying thresholds. After identifying the NLOS measurements, a two-step weighted-least-squares algorithm is used to obtain the localization, in which both range and angle measurements are considered. The simulation results reveal that the proposed algorithm yields a high identification probability of NLOS measurements, which results in improved localization performance. | Jingyu HUA Yejia YIN Anding WANG Yu ZHANG Weidang LU | 2019 | Science China(Information Sciences)2019，62，10： | 1 |
| 7 | Cooperative OFDM Relaying for Opportunistic Spectrum Sharing: Protocol Design and Resource Aliocation显示文摘 | LU Weidang GONG Vi TING S H | 2012 | IEEE Transaction on Wireless Communications2012，11，6： | 1 |
| 8 | A Novel Spectrum Handoff-Based Sensing-Throughput Tradeoff Scheme in Cognitive Radio显示文摘In cognitive radio(CR), there is a tradeoff between spectrum sensing time and throughput of secondary user(SU). In the conventional sensing-throughput tradeoff scheme, when the presence of the primary user(PU) is detected, the SU will stop forwarding data and wait to redetect the PU in the following frame, yielding great throughput loss. In order to improve the SU's throughput, a novel sensing-throughput tradeoff scheme is proposed, which allows the SU to search for a new idle channel through spectrum searching and transfer to this channel to continue communication, when the presence of the PU is detected. An optimization problem is proposed to maximize the SU's throughput in the proposed scheme through jointly optimizing the sensing time, the searching time and the number of available channels, providing that the detection probability to the PU is guaranteed. By fixing the number of channels, based on alternating direction optimization, the joint optimization algorithm of sensing time and searching time is proposed, and then the optimal number of channels is obtained through enumerative searching. The simulation results show that there exist the optimal solutions to the proposed scheme, and the proposed scheme outperforms the conventional scheme notably, with different detection probabilities and sampling frequencies. | Xin Liu Feng Li Weidang Lu | 2016 | China Communications2016，13，12： | 0 |
| 9 | Cooperative Anti-Interference Spectrum Sharing with Secondary User Selection显示文摘In this paper, we propose a cooperative anti-interference spectrum sharing strategy with secondary user selection where the secondary system can gain spectrum access along with the primary system. Specifically, secondary user and are selected to transmit the primary and secondary signal through different bandwidth in the second transmission slot which occupies fraction of the time. Thus, the primary and secondary systems will not interfere with each other. We study the joint optimization of time and bandwidth allocation such that the transmission rate of the secondary system is maximized, while guaranteeing the primary system to achieve its target rate. Simulation results confirm efficiency of the proposed spectrum sharing strategy, and the significant performance improvement of the cognitive system. | Peng Hong Zhu Yufei Lu Weidang Liu Xin Hua Jingyu | 2015 | China Communications2015，12，9： | 0 |
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