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| 1 | A COLLABORATIVE SPECTRUM SENSING SCHEME USING FUZZY COMPREHENSIVE EVALUATION IN COGNITIVE RADIO显示文摘Cognitive Radio(CR) is a promising technology to solve the challenging spectrum scarcity problem.However, to implement CR, spectrum sensing is the groundwork and the precondition.In this paper, a collaborative spectrum sensing scheme using fuzzy comprehensive evaluation is proposed.The final sensing decision of the proposed scheme is based on the combination of distributed sensing results of different Secondary Users(SUs).To improve the reliability of the sensing decision, the combination procedure takes into account the credibility of each SU, which is evaluated using fuzzy comprehensive evaluation.The effect of the presence of malicious SUs and malfunctioning SUs on the performance of the proposed scheme is also investigated.The efficiency of the scheme is validated through analysis and simulation. | Yang Wendong Ye Yuhuang Cai Yueming Xu Youyun | 2009 | Journal of Electronics(China)2009，26，3： | 3 |
| 2 | Power allocation for non-orthogonal decode-andforward cooperation protocol显示文摘This paper studies the power allocation problem for the non-orthogonal decode-and-forward (NDF) cooperation protocol with selection relaying. With the availability of the magnitudes of all channel gains at the source, the power allocation is explored that maximizes the mutual information between the source and destination subject to a total power constraint. The minimum power that avoids the outage of the relay is set as a condition, under which the power allocation problem becomes one of selecting the optimal one from several allocation factor triplets. It is shown that the power allocation scheme can provide considerable performance gain, and the non-orthogonal cooperation protocol is superior to the orthogonal protocol and direct transmission. | ZHANG Yong XU YouYun CAI YueMing | 2009 | Science in China(Series F)2009，52，6： | 3 |
| 3 | Energy-Efficient User Association in Heterogeneous Networks with M2M/H2H Coexistence under QoS Guarantees显示文摘In this paper, we propose an energy efficient user association scheme for uplink heterogeneous networks with machine-to-machine(M2M) and human-to-human(H2H) coexistence. A group based random access protocol is designed for massive number of machine-typecommunications(MTC) user equipments'(UEs) transmissions. A user association problem for UEs' energy efficiency maximization is formulated considering the HTC UEs' quality of service(QoS) guarantees and load balance among multiple BSs, simultaneously. A distributed iterative algorithm is developed to solve the optimization problem. In addition, the convergence of the proposed algorithm is proved. Simulation results show that our proposed scheme outperforms other schemes in terms of energy efficiency and QoS guarantees. | TIAN Hui XU Youyun XU Kui JING Jun WU Kun | 2015 | China Communications2015，12，S1： | 2 |
| 4 | Channel-aware multi-user uplink transmission scheme for SIMO-OFDM systems显示文摘The problem of medium access control(MAC) in wireless single-input multiple-output-orthogonal frequency division multiplexing(SIMO-OFDM) systems is addressed. Traditional random access protocols have low overheads and inferior performance. Centralized methods have superior performance and high overheads. To achieve the tradeoff between overhead and performance,we propose a channelaware uplink transmission(CaUT) scheme for SIMO-OFDM systems. In CaUT,users transmit requestto-send(RTS) at some subcarriers whose channel gains are above a predetermined threshold. Using the channel state information provided by RTS,access point performs user selection with receive beamforming to decide which users can access and then broadcasts the selection results via clear-to-send(CTS) to users. We present a distributed power control scheme by using a simple fixed modulation mode. We optimize the modulation order and channel gain thresholds to maximize the separable packets subject to the bit-error-rate(BER) and temporal fairness requirements and the individual average transmit power constraints. The performance of CaUT scheme is analyzed analytically and evaluated by simulations. Simulation results show that CaUT can achieve more significant throughput performance than traditional random access protocols. | PAN ChengKang CAI YueMing XU YouYun | 2009 | Science in China(Series F)2009，52，9： | 2 |
| 5 | Improve throughput of TCP-Vegas in multihop ad hoc networks 显示文摘 | Ding Lianghui Wang Xinbing Xu Youyun | 2008 | Computer Communications2008，31，10： | 1 |
| 6 | Dynamics of the SARS-CoV-2 antibody response up to 10 months after infection显示文摘COVID-19 caused by SARS-CoV-2 infection has caused substantial morbidity and mortality worldwide and paralyzed the international economy.Understanding the magnitude and duration of the antibody response to SARS-CoV-2 is important to achieve a balance between curbing the pandemic and minimizing adverse effects on society.1 Although the antibody response to SARS-CoV-2 within 9 months has been extensively studied,2,3,4,5,6 little is known about the magnitude and kinetics of antibody responses for over 9 months.Moreover,with limited observations over 9 months(n<100),2,7,8 several studies have produced inconsistent conclusions about antibody dynamics,suggesting different rates of antiviral antibody positivity at the last follow-up.2,7,8 These studies have been limited by a lack of measurement of neutralizing antibodies(NAbs),7 of inclusion of mild or asymptomatic cases,2,8 and of further exploration of potential predisposing factors for antibody dynamics.2,7 Considering the individual heterogeneity(such as disease severity)8 and time-dependent nature1 of the immune response,in-depth characterization of SARS-CoV-2 antibody kinetics across disease severity groups over a long period is urgently needed.Therefore,we repeatedly tested IgM,IgG,viral spike protein receptor-binding dom(anti-RBD)IgG,and NAb titers in COVID-19 patients during a follow-up period of up to 10 months and explored potential predisposing factors of antibody titers during follow-up. | Hao Wang Yu Yuan Mingzhong Xiao Li Chen Youyun Zhao Haiwei Zhang Pinpin Long Yana Zhou Xi Xu Yanshou Lei Bihao Wu Tingyue Diao Hao Cai Li Liu Zuoyu Shao Jingzhi Wang Yansen Bai Kai Wang Miao Peng Linlin Liu Shi Han Fanghua Mei Kun Cai Yake Lei An Pan Chaolong Wang Rui Gong Xiaodong Li Tangchun Wu | 2021 | Cellular & Molecular Immunology2021，18，7： | 1 |
| 7 | Multi-radio channel allocation in muhi-hop wireless networks 显示文摘 | Gao Lin Wang Xinbing Xu Youyun | 2009 | IEEE Transaction on Mobile Computing2009，8，11： | 1 |
| 8 | On max- SINR receiver for HMT system over doubly dispersive channel显示文摘 | Xu Kui Xu Youyun Zhang Dongmei | 2013 | IEEE Transactions on Vehicular Technol- ogy2013，62，5： | 1 |
| 9 | Game-theoretic opportunistic spectrum sharing strategy selection for cognitive MIMO multiple access channels显示文摘 | Zhong Wei Xu Youyun Tianfield H | | 0，，06： | 1 |
| 10 | Wireless Cooperative Mesh Network:A New Architecture for Network Convergence显示文摘The convergence of heterogeneous wireless networks is a trend in the evolution of wireless networks.A new architecture for network convergence,named Wireless Cooperative Mesh Network,is proposed to solve such emerging problems in convergence as transmission mode selection,load balancing,routing and handover.The new architecture is based on the structure of Wireless Mesh Networks (WMNs),and cooperative communication is also employed to further optimize its structure and upgrade its performance.It can thus obtain advantages of both the Mesh technology (high spectrum efficiency and dynamic self-organization) and cooperative communication (high diversity gain and high energy efficiency).The new architecture serves as an efficient solution for wireless network convergence. | Yang Wendong,Cao Yueming,Xu Youyun(Institute of Communications Engineering,PLA University of Science and Technology,Nanjing 210007,China) | 2008 | ZTE Communications2008，6，3： | 1 |
| 11 | Configurable multi-rate decoder architecture for QC-LDPC codes based broadband broadcasting system显示文摘 | Zhang Luoming Gui Lin Xu Youyun | 2008 | IEEE Transactons onbroadcasting2008，54，2： | 1 |
| 12 | Spectrum trading in cog- nitive radio networks: a contract-theoretic modeling approach显示文摘 | GAO Lin WANG Xinbing XU Youyun | 2011 | IEEE Journal on Selected Areas in Communications2011，29，4： | 1 |
| 13 | Multipair two-way massive MIMO AF relaying with ZFR/ZFT and hardware impairments over high-altitude platforms显示文摘HAPs(High-Altitude Platforms)are one of the most promising alternative infrastructures for providing wireless communications to overcome the shortcomings of terrestrial-tower-based and satellite systems.This paper investigates a multipair two-way MM-AF(Massive MIMO Amplify-and-Forward)relay system over HAPs,where multiple user pairs exchange information within a pair through a relay with a very large number of antennas,and a HAP channel is modeled to follow a Rician fading distribution because of the presence of a line-of-sight path.First,the effect of hardware impairments on a multipair two-way MM-AF system is taken into consideration and is modeled using transmit and receive distortion noises.Then,ZFR/ZFT(Zero-Forcing Reception/Zero-Forcing Transmission)processing matrices of HDR(Half-Duplex Relaying)and FDR(Full-Duplex Relaying)with imperfect channel state information are presented.Finally,the asymptotic expressions of an end-to-end SINR are derived.Theoretical analyses and simulation results show that when the number of relay antennas grows very large,the SE(Spectral Efficiency)of an MM-AF relay system is limited by hardware impairments at the users instead of those at the relay,or by other types of interference.Thus,the quality of the hardware at a relay can be decreased without significantly degrading performance. | SUN Xiaoli XU Kui XU Youyun MA Wenfeng | 2016 | Journal of Communications and Information Networks2016，1，3： | 1 |
| 14 | Map:multiauctioneer progressive auction for dynamic spectrum access显示文摘 | Gao Lin Xu Youyun Wang Xinbing | 2011 | IEEE Transactions on Mobile Computing2011，10，8： | 1 |
| 15 | Spectrum trading in cognitive radio networks:a contract-theoretic modeling approach 显示文摘 | Gao Lin Wang Xinbing Xu Youyun | 2011 | IEEE Journal on Selected Areas in Com- munications2011，29，4： | 1 |
| 16 | Distributed Relay Selection over Multi-Source and Multi-Relay Wireless Cooperative Networks with Selfish Nodes显示文摘 | Li Depeng Xu Youyun Liu Jing | 2010 | Computer Communications2010，33，17： | 1 |
| 17 | A NOVEL SEMI-BLIND TIME-FREQUENCY DOMAIN TRACKING ALGORITHM SUITABLE FOR MPSK-OFDM显示文摘This paper presents a semi-blind tracking algorithm used for Multiple Phase Shift Keying based Orthogonal Frequency Division Multiplexing(MPSK-OFDM) system. By using special pream-bles to assist the decision of a feedback loop and to solve the problem of phase ambiguity,the tracking performance of the algorithm has been improved greatly. Only a few preambles are needed in the al-gorithm since the preambles are not used to estimate the frequency offset but used to provide the variation information of the phase due to the presence of frequency offset. Simulations verify that the algorithm has low SNR bound for tracking as well as high tracking accuracy and the tracking range is expanded to 30% of one subcarrier spacing. | Wei Li Xu Youyun Cai Yueming Pan Xiaofei | 2008 | Journal of Electronics(China)2008，25，2： | 0 |
| 18 | ROBUST AND FAST FREQUENCY OFFSET ESTIMATION FOR OFDM BASED SATELLITE COMMUNICATION显示文摘A pilot-aided Orthogonal Frequency Division Multiplexing (OFDM) frequency offset es- timator designed for satellite communication system is proposed in the paper. The estimator focuses on the acquisition of the integer part of carrier frequency offset and the acquisition range is as large as the whole signal bandwidth. Making full use of the phase difference between received pilot and local ref- erential pilot, a fast estimation is obtained. Compared with existing method, our method can also work well even in SNR as low as 0dB. Simulations verify the good performance of our method. | Wei Li Xu Youyun Cai Yueming | 2009 | Journal of Electronics(China)2009，26，1： | 0 |
| 19 | Improved iterative breadth-first detection algorithms for MIMO wireless systems显示文摘 | 郑武 Song Wentao Zhang Haibin Xu Youyun | 2007 | High Technology Letters2007，13，2： | 0 |
| 20 | Markov approximation for multilayered selection in satellite network显示文摘A satellite network system comprises three layers of satellites:LEO(Low Earth Orbit),MEO(Middle Earth Orbit)and GEO(Geostationary Orbit).In the system,users can choose a layer according to their demands,including QoS(Quality of Service),congestion,energy cost,etc.The utility that users gain will change when they access satellites in different layers.The mobility of satellites in the LEO and MEO leads to frequent handover among satellites in the same layer.These characteristics of multi-layered satellite networks make it possible for us to exploit the optimal distribution of users,which will maximize the utility of the entire satellite network.While the proposed problem is an NP-hard problem,we analyze the system based on the Markov chain and use the Markov approximation to approach the maximum utility.In addition,we use the count down and select algorithm to implement the process of Markov chain.The simulation results validate the convergence of the Markov approximation.In addition,the gap between the approximate value and optimal values decreases with an increase inβ,which is a positive constant in Markov formulation,according to the simulation results. | LI Yiqing LI Yuqing GAN Xiaoying WANG Jingchao XU Youyun WANG Xinbing | 2016 | Journal of Communications and Information Networks2016，1，3： | 0 |
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