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| 1 | An overview of transmission theory and techniques of large-scale antenna systems for 5G wireless communications显示文摘To meet the future demand for huge traffic volume of wireless data service, the research on the fifth generation(5G) mobile communication systems has been undertaken in recent years. It is expected that the spectral and energy efficiencies in 5G mobile communication systems should be ten-fold higher than the ones in the fourth generation(4G) mobile communication systems. Therefore, it is important to further exploit the potential of spatial multiplexing of multiple antennas. In the last twenty years, multiple-input multiple-output(MIMO) antenna techniques have been considered as the key techniques to increase the capacity of wireless communication systems. When a large-scale antenna array(which is also called massive MIMO) is equipped in a base-station, or a large number of distributed antennas(which is also called large-scale distributed MIMO)are deployed, the spectral and energy efficiencies can be further improved by using spatial domain multiple access. This paper provides an overview of massive MIMO and large-scale distributed MIMO systems, including spectral efficiency analysis, channel state information(CSI) acquisition, wireless transmission technology, and resource allocation. | Dongming WANG Yu ZHANG Hao WEI Xiaohu YOU Xiqi GAO Jiangzhou WANG | 2016 | Science China(Information Sciences)2016，59，8： | 21 |
| 2 | High-sum-rate beamformers for multi-pair two-way relay networks with amplify-and-forward relaying strategy显示文摘In multi-pair two-way relay networks,the control over inter-pair-interference is a challenging problem.When mobile stations(MSs)cooperate fully,to achieve the sum capacity of networks and at the same time completely remove the inter-pair-interference,a singular value decomposition(SVD)based beamforming scheme at relay station(RS)is established where SVD beamformers are applied over both uplink and downlink channels,respectively.To avoid any cooperation among users,an efcient beamforming scheme is proposed.This scheme uses the Max-SINR based receive beamformer at RS in uplink channel and the Max-SLNR based transmit precoder at RS in downlink channel.It omits interference(uplink)and leakage(donwlink)inside each pair of users due to their abilities of self-interference cancellation.This beamforming scheme provides an analytical solution like some well-known linear beamformers such as zero-forcing,block diagonalization,etc.From simulation,we find:the proposed SVD shows an excellent sum-rate performance at the expense of a large cooperation overhead at MSs and can be used as a tighter upper bound of sum-rate;the proposed scheme of Max-SINR beamformer plus Max-SLNR precoder performs much better on sum-rate than the ZF-based and the BD-based schemes by using almost the same computational amount. | SHU Feng LU YaZhe CHEN Yu YOU XiaoHu WANG JianXin WANG Mao SHENG WeiXing CHEN Qian | 2014 | Science China(Information Sciences)2014，57，2： | 15 |
| 3 | New method for camera pose estimation based on line correspondence显示文摘The key technology of the measuring method of pose shaking of unstable platform based on CCD lies in the camera pose estimation.A new method for camera pose estimation based on line correspondence is put forward in this paper.First,two appropriate lines are selected in the space to establish a local coordinate system,the remaining lines form three-line sets with these two lines respectively and then the angle depth of the lines of the local coordinate system can be obtained by using the linearity of interpretation plane;then the invariance of included angle between spatial coordinate system and camera coordinate system during rigid transformation is used to establish a constraint equation set of angle depth of three lines similar to traditional P3P,and the corresponding angle depth of the third line in the set can be obtained linearly by variable substitution;finally,the rotation matrix can be expressed with quaternion and the pose parameters of camera in the space can be calculated by singular value decomposition(SVD).The static experiment and dynamic experiment verify the accuracy and stability of the algorithm and that the camera pose shocking is within 1°and the 3σ error is superior to 0.3′.The method in this paper can be directly used in the micro-vibration measurement of experimental platform and robot navigation and other fields and is of important theoretical significance and engineering application prospect. | LIU JinBo ZHANG XiaoHu LIU HaiBo YUAN Yun ZHU ZhaoKun YU QiFeng | 2013 | Science China(Technological Sciences)2013，56，11： | 11 |
| 4 | Monocular trajectory intersection method for 3D motion measurement of a point target显示文摘This article proposes a monocular trajectory intersection method,a videometrics measurement with a mature theoretical system to solve the 3D motion parameters of a point target.It determines the target’s motion parameters including its 3D trajectory and velocity by intersecting the parametric trajectory of a motion target and series of sight-rays by which a motion camera observes the target,in contrast with the regular intersection method for 3D measurement by which the sight-rays intersect at one point.The method offers an approach to overcome the technical failure of traditional monocular measurements for the 3D motion of a point target and thus extends the application fields of photogrammetry and computer vision.Wide application is expected in passive observations of motion targets on various mobile beds. | YU QiFeng SHANG Yang ZHOU Jian ZHANG XiaoHu LI LiChun | 2009 | Science China(Technological Sciences)2009，52，12： | 10 |
| 5 | ^(40)Ar/^(39)Ar ages of seamount trachytes from the South China Sea and implications for the evolution of the northwestern sub-basin显示文摘A chronological study of seamount rocks in the South China Sea basin provides a great opportunity to understand the expansion and evolution history of the sea basin.In this paper,we analyzed the40Ar/39Ar age of trachytic samples collected from the Shuangfeng seamounts in the northwestern sub-basin of the South China Sea.The two samples yielded plateau ages of 23.80 0.18 and 23.29 0.22 Ma,respectively,which indicate magmatic activity in late Oligocene which helpful constraints the expansion time of the northwest sub-basin.Previous studies suggested that the northwestern sub-basin and southwestern sub-basin have experienced a relatively consistent expansion in the NWeSE direction followed by a late expansion of the eastern sub-basin.We concluded that the expansion of the northwestern sub-basin began prior to ca.24 Ma,which also implicated magmatic events of a late or stop expansion of the northwestern sub-basin combined with our results of40Ar/39Ar age data and previous geophysical data. | Xiaohu Li Jiabiao Li Xing Yu Chunsheng Wang Fred Jourdan | 2015 | Geoscience Frontiers2015，6，4： | 9 |
| 6 | Low-complexity optimal spatial channel pairing for AF-based multi-pair two-way relay networks显示文摘This paper considers a multi-pair two-way relay system with multi-antenna users and proposes a low-complexity optimal spatial channel pairing(SCP) strategy at the relay station(RS) for such a system. The proposed SCP scheme, following the BD-like beamformer at RS, pairs the uplink spatial subchannels of each user pair with the corresponding downlink spatial subchannels by maximizing sum-rate(Max-SR). Furthermore, a new mathematical inequality(arrangement inequalities of a product) is developed and applied to obtain sufficient and necessary conditions for achieving Max-SR-SCP. This also yields a simple low-complexity implementation of the proposed SCP in contrast to the NP-hard complexity of the original Max-SR-SCP problem. Simulation results illustrate that the proposed Max-SR-SCP achieves substantial sum-rate gains over other pairing schemes. | SHU Feng CHEN Yu YOU XiaoHu LU JinHui | 2014 | Science China(Information Sciences)2014，57，10： | 6 |
| 7 | Videometric research on deformation measurement of large-scale wind turbine blades显示文摘Utilization of wind energy is a promising way to generate power,and wind turbine blades play a key role in collecting the wind energy effectively.This paper attempts to measure the deformation parameter of wind turbine blades in mechanics experiments using a videometric method. In view that the blades experience small buckling deformation and large integral deformation simultaneously, we proposed a parallel network measurement(PNM) method including the key techniques such as camera network construction,c... | Xiangyi Sun,Yun Yuan,~(a))Zhaokun Zhu,Xiaohu Zhang,and Qifeng Yu College of Aerospace and Materials Engineering,National University of Defense Technology,Changsha 410073, Hunan,China | 2011 | Theoretical & Applied Mechanics Letters2011，1，1： | 5 |
| 8 | Correction method for non-landing measuring of vehicle-mounted theodolite based on static datum conversion显示文摘During the non-landing measuring of vehicle mounted theodolite, especially under high-speed tracking measurement, the misalignment of theodolite's center of mass and spindle etc. will cause high-frequency vibration of theodolite platform, increase the observation error of targets and even unbelievable results. In this paper, a correction method of non-landing measuring of theodolite based on static datum conversion is presented, which can effectively improve the observation accuracy of theodolite. The CCD camera is fixed to the theodolite platform to calculate the gesture shaking quantity of theodolite platform in geodetic coordinate system through the real time imaging of static datum. The observation results of theodolite are corrected by using such shaking quantity. The experiment shows that the correction accuracy exceeds 10 s of arc. The intrinsic parameter calibration technology of camera based on stellar angular distance and absolute conic put forward in this paper can prevent the estimated error of extrinsic parameters influencing the intrinsic parameter calibration and improve the intrinsic parameter calibration accuracy; the static datum conversion technology can reduce the influence of installation error of camera and theodolite platform on gesture measuring of the platform. The simulation experiment shows that when the shaking range of the platform is less than 30 min of arc, the influence of the three-axis installation error of camera within 3deg on the accuracy of correction results is less than 8 s of arc. The method in this paper can be extended to and used in the field of gesture shaking measuring and micro-structure deformation of various unstable platforms, therefore it is of important theoretical research significance and has wide engineering application prospect. | LIU JinBo ZHANG XiaoHu LIU HaiBo YUAN Yun ZHU ZhaoKun YU QiFeng | 2013 | Science China(Technological Sciences)2013，56，9： | 5 |
| 9 | Endothelial PDGF-BB/PDGFR-βsignaling promotes osteoarthritis by enhancing angiogenesis-dependent abnormal subchondral bone formation显示文摘The mechanisms that coordinate the shift from joint homeostasis to osteoarthritis(OA)remain unknown.No pharmacological intervention can currently prevent the progression of osteoarthritis.Accumulating evidence has shown that subchondral bone deterioration is a primary trigger for overlying cartilage degeneration.We previously found that H-type vessels modulate aberrant subchondral bone formation during the pathogenesis of OA.However,the mechanism responsible for the elevation of H-type vessels in OA is still unclear.Here,we found that PDGFR-βexpression,predominantly in the CD31^(hi)Emcn^(hi) endothelium,was substantially elevated in subchondral bones from OA patients and rodent OA models.A mouse model of OA with deletion of PDGFR-βin endothelial cells(ECs)exhibited fewer H-type vessels,ameliorated subchondral bone deterioration and alleviated overlying cartilage degeneration.Endothelial PDGFR-βpromotes angiogenesis through the formation of the PDGFR-β/talin1/FAK complex.Notably,endothelium-specific inhibition of PDGFR-βby local injection of AAV9 in subchondral bone effectively attenuated the pathogenesis of OA compared with that of the vehicle-treated controls.Based on the results from this study,targeting PDGFR-βis a novel and promising approach for the prevention or early treatment of OA. | Zhuang Cui Hangtian Wu Ye Xiao Ting Xu Junjie Jia Hancheng Lin Rongmin Lin Kun Chen Yihuang Lin Kaiqun Li Xiaohu Wu Changjun Li Bin Yu | 2022 | Bone Research2022，10，4： | 4 |
| 10 | 3D non-stationary wideband circular tunnel channel models for high-speed train wireless communication systems显示文摘This paper proposes three-dimensional(3D) non-stationary wideband circular geometry-based stochastic models(GBSMs) for high-speed train(HST) tunnel scenarios. Considering single-bounced(SB)and multiple-bounced(MB) components from the tunnel's internal surfaces, a theoretical channel model is first established. Then, the corresponding simulation model is developed using the method of equal volume(MEV)to calculate discrete angular parameters. Based on the proposed 3D GBSMs, important time-variant statistical properties are investigated, such as the temporal autocorrelation function(ACF), spatial cross-correlation function(CCF), and space-Doppler(SD) power spectrum density(PSD). Results indicate that all statistical properties of the simulation model, verified by simulation results, can match well those of the theoretical model.The statistical properties of the proposed 3D GBSMs are further validated by relevant measurement data,demonstrating the flexibility and utility of our proposed tunnel GBSMs. | Yu LIU Cheng-Xiang WANG Carlos LOPEZ Xiaohu GE | 2017 | Science China(Information Sciences)2017，60，8： | 4 |
| 11 | Relay camera videometrics based conversion method for unstable platform to static reference显示文摘This article proposes a relay camera videometrics based method to convert an unstable measuring platform to a static reference to solve the problems of large error or invalidation caused by measuring platform instability in photogrammetric and videometric measurements.The method installs a relay camera on the unstable platform and captures images of a reference marker fixed on a static reference or vice versa to resolve the 3D movement of the unstable platform relative to the static reference,based on which it corrects the error of the measured results and thus eliminating the influence of the platform movement.It finds new and important applications for videometrics by making high-precision dynamic measurement possible on unstable platforms.Verification experiments and numerical simulations have proven its validity and practicability. | YU QiFeng SUN XiangYi JIANG GuangWen LIU XiaoLin ZHANG XiaoHu ZHOU Jian SHANG Yang | 2011 | Science China(Technological Sciences)2011，54，4： | 4 |
| 12 | Prophet model and Gaussian process regressionbased user traffic prediction in wireless networks显示文摘User traffic prediction is an important topic for wireless network operators.A user traffic prediction method based on Prophet and Gaussian process regression is proposed in this paper.The proposed method first employs discrete wavelet transform to decompose the user traffic time series to high-frequency component and low-frequency component.The low-frequency component bears the long-range dependence of user network traffic,while the high-frequency component reveals the gusty and irregular fluctuations of user network traffic.Then Prophet model and Gaussian process regression are applied to predict the two components respectively based on the characteristics of the two components.Experimental results demonstrate that the proposed model outperforms the existing time series prediction method. | Yu LI Ziang MA Zhiwen PAN Nan LIU Xiaohu YOU | 2020 | Science China(Information Sciences)2020，63，4： | 4 |
| 13 | Full-parameter vision navigation based on scene matching for aircrafts显示文摘Vision navigation based on scene matching between real-time images and a reference image has many advantages over the commonly used inertial navigation system(INS),such as no cumulative measurement errors for long-endurance flight.Recent developments in vision navigation are mainly used for partial navigation parameters measurements,such as the position and the relative velocity,which cannot meet the requirements of completely autonomous navigation.We present the concept,principle and method of full-parameter vision navigation(FPVN)based on scene matching.The proposed method can obtain the three-dimensional(3D)position and attitude angles of an aircraft by the scene matching for multiple feature points instead of a single point in existing vision navigations.Thus,FPVN can achieve the geodetic position coordinates and attitude angles of the aircraft and then the velocity vector,attitude angular velocity and acceleration can be derived by the time differentials,which provide a full set of navigation parameters for aircrafts and unmanned aerial vehicles(UAVs).The method can be combined with the INS and the cumulative errors of the INS can be corrected using the measurements of FPVN rather than satellite navigation systems.The approach provides a completely autonomous and accurate navigation method for long-endurance flight without the help of satellites. | YU QiFeng SHANG Yang LIU XiaoChun LEI ZhiHui LI Xiang ZHU XianWei LIU XiaoLin YANG Xia SU Ang ZHANG XiaoHu ZHANG HongLiang | 2014 | Science China(Information Sciences)2014，57，5： | 3 |
| 14 | Hull deformation measurement for spacecraft TT&C ship by Photogrammetry显示文摘When voyaging,ships are subject to inevitable hull deformations caused by the changes in the environmental temperature and external stress.These are a crucial source of errors when measuring data using a spacecraft tracking,telemetry,and control(TT&C) ship.A prototype system based on photogrammetry was developed for the real-time measurement of a spacecraft TT&C ship's hull deformation.This system has high accuracy,a simple structure,and convenient maintenance,and requires few changes to the ship's structures.To improve its performance,an estimation approach is proposed for hull deformation angles.With the proposed approach,the central positions of cross spots in successive frames can be predicted based on the prediction of the camera's attitude,and their extract locations can be found by defining a series of small windows around each predictive location.Then,the optimal estimate of the camera's attitude is updated by the designed extended Kalman filter using the extracted cross spots and their corresponding local coordinates,with which the hull deformation angles can be found.To verify the proposed measurement approach,its performance was tested during the normal sailing,floating,and rocking on the sea of a spacecraft TT&C ship.The experimental testing results demonstrated that the proposed approach performs well in terms of accuracy and robustness.It can satisfy the hull deformation measurement requirement for a spacecraft TT&C ship in real time. | LIU HaiBo SUN Cong ZHANG YueQiang LIU XinMing LIU JinBo ZHANG XiaoHu YU QiFeng | 2015 | Science China(Technological Sciences)2015，58，8： | 2 |
| 15 | Dynamic Learning Rate Optimization of the Back Propagation Algorithm显示文摘 | Yu Xiaohu | 1995 | IEEE Trans Neural Networks1995，6，3： | 1 |
| 16 | Core-Shell Structure of NaYF4@SiO2@Au Nanocomposite of Synthesis and Characterization with Mechanisms Research显示文摘A facile method for preparing monodisperse NaYF4@SiO2@Au core-shell nanocomposite was developed. Transmission electron microscopy(TEM) as well as EDX(energy dispersive X-ray) was used to characterize the samples. The TEM showed the composite was a core-shell structure, spherical,with the uniform size of about 100 nm. TEM and EDX revealed that the NPs were coated with a layer of SiO2 and Au shell. The core shell structure of NaYF4@SiO2@Au nanocomposite could dispersed in water easily. More importantly,after being coated with SiO2 and Au, it was feasible for function by-SH and-NH2 groups, respectively. The forming process of the Au shell was monitored with TEM. The mechanism of coating Au shell was discussed in detail. It is expected that the core shell nanoparticle will act as multifunctional molecular imaging probes, such as positron emission tomography(PET), magnetic resonance imaging(MRI), optical imaging(OI), or contrast agent for sensing and detection. | 吴睿 HAO Liang YU Xiaohu LIU Cunfang TIAN Guanghui ZHANG Qiang SHI Juan 葛红光 | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，4： | 1 |
| 17 | Toward beyond 3G:the future project in China显示文摘 | Yu Xiaohu Chen Guoan Chen Ming | 2005 | IEEE Communications Magazine2005，43，1： | 1 |
| 18 | Analytical method for camera calibration from a single image with four coplanar control lines 显示文摘 | Shang Yang Yu Qifeng Zhang Xiaohu | 2004 | Applied Optics2004，43，28： | 1 |
| 19 | -Toward beyond 3G: the FUTURE project in China显示文摘 | Yu Xiaohu | 2005 | IEEE Commun Mag2005，43，： | 1 |
| 20 | Dynamic learning rate op timization of the back propagation algorithm显示文摘 | Yu Xiaohu | 1995 | IEEE Trans Neural Networks1995，6，3： | 1 |
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