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| 1 | Joint Computing and Communication Resource Allocation for Satellite Communication Networks with Edge Computing显示文摘Benefit from the enhanced onboard processing capacities and high-speed satellite-terrestrial links,satellite edge computing has been regarded as a promising technique to facilitate the execution of the computation-intensive applications for satellite communication networks(SCNs).By deploying edge computing servers in satellite and gateway stations,SCNs can achieve significant performance gains of the computing capacities at the expense of extending the dimensions and complexity of resource management.Therefore,in this paper,we investigate the joint computing and communication resource management problem for SCNs to minimize the execution latency of the computation-intensive applications,while two different satellite edge computing scenarios and local execution are considered.Furthermore,the joint computing and communication resource allocation problem for the computation-intensive services is formulated as a mixed-integer programming problem.A game-theoretic and many-to-one matching theorybased scheme(JCCRA-GM)is proposed to achieve an approximate optimal solution.Numerical results show that the proposed method with low complexity can achieve almost the same weight-sum latency as the Brute-force method. | Shanghong Zhang Gaofeng Cui Yating Long Weidong Wang | 2021 | China Communications2021，18，7： | 8 |
| 2 | Timing Advanced Estimation Algorithm of Low Complexity Based on DFT Spectrum Analysis for Satellite System显示文摘In satellite mobile communication system, relative movement of the satellite and the terminal will cause a large Doppler offset. Timing advanced estimation with Zadoff-Chu sequence is sensitive to the frequency offset. When the frequency offset is larger than one times subcarrier spacing, the value of peak cannot be detected at the receiving end. To suppress the larger Doppler frequency shift, this paper proposes a novel timing advanced estimation scheme(TAE-MCD) for satellite communication system. In this algorithm, t r a n s m i t t e d s i g n a l i s d i v i d e d i n t o Z C sequence and its conjugate sequence. Using multiplication and DFT operation to find the estimated peak at the receiving end, and make subtraction with the obtained sequences at last. The scheme can not only inhibit the adverse effects of large Doppler frequency shift in timing estimation effectively, but also reduce the computational complexity at the receiving end and improve the work efficiency of the hardware. Simulations results show that TAEMCD outperform the existing timing advanced estimation methods, on the condition of no additional time and frequency resource are needed. | HE Yizhou CUI Gaofeng LI Pengxu CHANG Ruijun WANG Weidong | 2015 | China Communications2015，12，4： | 4 |
| 3 | High Emissivity MoSi_2-Zro_2-Borosilicate Glass Multiphase Coating with SiB6 Addition for Fibrous ZrO_2 Ceramic显示文摘The reusable thermal protective system consisting of high emissivity coatings used on the surface and a low thermal conductivity substrate used inside must be created to protect the reused space vehicles,which could decrease the surface temperature by radiation and prevent heattransfer via | Gaofeng Shao Xiaodong Wu Sheng Cui Xiaodong Shen | 2016 | 功能材料信息2016，13，1： | 3 |
| 4 | Joint Estimation of Carrier Frequency and Phase Offset Based on Pilot Symbols in Quasi-Constant Envelope OFDM Satellite Systems显示文摘Spectral efficiency and energy efficiency are two important performance indicators of satellite systems. The Quasi-Constant Envelope Orthogonal Frequency Division Multiplexing(QCE-OFDM) technique can achieve both high spectral efficiency and low peak-to-average power ratio(PAPR). Therefore, the QCE-OFDM technique is considered as a promising candidate multi-carrier technique for satellite systems. However, the Doppler effect will cause the carrier frequency offset(CFO), and the non-ideal oscillator will cause the carrier phase offset(CPO) in satellite systems. The CFO and CPO will further result in the bit-error-rate(BER) performance degradation. Hence, it is important to estimate and compensate the CFO and CPO. This paper analyzes the effects of both CFO and CPO in QCE-OFDM satellite systems. Furthermore, we propose a joint CFO and CPO estimation method based on the pilot symbols in the frequency domain. In addition, the optimal pilot symbol structure with different pilot overheads is designed according to the minimum Cramer-Rao bound(CRB) criterion. Simulation results show that the estimation accuracy of the proposed method is close to the CRB. | Cheng Wang Gaofeng Cui Weidong Wang Yinghai Zhang | 2017 | China Communications2017，14，7： | 3 |
| 5 | Frequency Offset Compensation for Satellite Communication System with CE-OFDM显示文摘Constant envelope orthogonal frequency division multiplexing(CE-OFDM) is a waveform that can achieve 0d B peak-to-average power ratio and avoid the signal distortion caused by the nonlinear power amplifi er. However, the carrier frequency offset(CFO) in CE-OFDM systems can cause errors at phase unwrapper module. In this paper, a CFO estimation scheme is proposed for CEOFDM in satellite communication system. As the null subcarrier is inherent in the conjugate symmetric symbol structure at the transmitter, the proposed scheme uses the null subcarrier as prior information to estimate the CFO at the receiver. The ideal estimation range of normalized CFO is obtained by mathematical analysis. Simulation results show that the proposed scheme can estimate the CFO accurately under additive white Gaussian noise(AWGN) channel and multipath fading channel, especially for moderate and high signal-to-noise ratio(SNR). | Gaofeng Cui Cheng Wang Weidong Wang Yinghai Zhang | 2017 | China Communications2017，14，8： | 3 |
| 6 | Random access preamble design based on time pre-compensation for LTE-satellite system显示文摘Because of the integration of long term evolution(LTE) technology and mobile satellite communication systems, uplink access technology for LTE-based geo-stationary earth orbit(GEO) satellite has become a popular research topic for satellite system. In order to solve the problem of unreasonable design for physical random access channel(PRACH) signal structure and reduce the effect of time uncertainty, this paper proposes a novel random access preamble based on time pre-compensation(TPC) for LTE-Satellite(LTE-S) system. In this scheme, by applying the method of non-linear least squares, the user terminal(UT) can use the receiving power to estimate the communication round trip delay(RTD) and based on the transmission delay of the beam center and the satellite, RTD can be compensated before transmission. Therefore, the preamble length and duration can be reduced without related to the maximum of RTD. In order to verify the performance of the scheme, the MATLAB is used to build a test system. The simulation results show that the proposed preamble satisfies the requirements of LTE-S system, and the better performance than previous researches is obtained. | He Yizhou Cui Gaofeng Li Pengxu Chang Ruijun Wang Weidong | 2015 | The Journal of China Universities of Posts and Telecommunications2015，22，3： | 2 |
| 7 | Autoimmune pancreatitis: whole-body 18 F-FDG PET/CT findings显示文摘 | Jian Zhang Chengwei Shao Jianhua Wang Chao Cheng Changjing Zuo Gaofeng Sun Bin Cui Aisheng Dong Qinghua Liu Lingshan Kong | 2013 | Abdominal Imaging2013，，3： | 2 |
| 8 | Experimental and numerical investigations on fatigue behavior of aluminum alloy 7050-T7451 single lap four-bolted joints显示文摘The fatigue behavior of aluminum alloy 7050-T7451 single lap four-bolted joints was studied by highfrequency fatigue test and finite element(FE) methods. The fatigue test results showed that a better enhancement of fatigue life was achieved for the joints with high-locked bolts by employing the combinations of cold expansion, interference fit, and clamping force. The fractography revealed that fatigue cracks propagated tortuously; more fatigue micro-cliffs, tearing ridges, lamellar structure were observed,and fatigue striation spacing was simultaneously reduced. The evaluation of residual stress conducted by FE methods confirmed the experimental results and locations of fatigue crack initiation. The extension of fatigue lives can be attributed to the evolution of fatigue damage and effect of beneficial compressive residual stresses around the hole, resulting in the delay of crack initiation, crack deflection, and plasticity-induced crack closure. | Xiaomei Liu Hao Cui Shangzhou Zhang Haipo Liu Gaofeng Liu Shujun Li | 2018 | Journal of Materials Science & Technology2018，34，7： | 2 |
| 9 | User-Level Scheduling and Resource Allocation for Multi-Beam Satellite Systems with Full Frequency Reuse显示文摘Multi-beam satellite communication systems can improve the resource utilization and system capacity effectively.However,the inter-beam interference,especially for the satellite system with full frequency reuse,will degrade the system performance greatly due to the characteristics of multi-beam satellite antennas.In this article,the user scheduling and resource allocation of a multi-beam satellite system with full frequency reuse are jointly studied,in which all beams can use the full bandwidth.With the strong inter-beam interference,we aim to minimize the system latency experienced by the users during the process of data downloading.To solve this problem,deep reinforcement learning is used to schedule users and allocate bandwidth and power resources to mitigate the inter-beam interference.The simulation results are compared with other reference algorithms to verify the effectiveness of the proposed algorithm. | Tao Leng Yanan Wang Dongwei Hu Gaofeng Cui Weidong Wang | 2022 | China Communications2022，19，6： | 1 |
| 10 | Localization of indoleamine 2,3-dioxygenase in human esophageal squamous cell carcinomas显示文摘 | Jinzhong Liu Gaofeng Lu Fuai Tang Yiqing Liu Guanglin Cui | 2009 | Virchows Archiv2009，，： | 1 |
| 11 | Preparation and characterization of a new orange-red phosphor Ba_(2)LaTaO_(6):Eu^(3+)with abnormal thermal quenching显示文摘Herein,double-perovskite Ba_(2)LaTaO_(6) Eu-doped orange-red phosphors were successfully synthesized using a high-temperature solid-phase method.The phosphor phase purity was investigated using X-ray diffraction and microscopic morphology analyses.Their luminescence properties were investigated using absorption,emission,excitation,and temperature-dependent spectra.The transition mechanism mainly involves a magnetic-dipole transition with an energy transfer mode featuring multipole-multipole interactions,and concentration quenching is achieved via dipole-dipole interactions.In addition,the intensity of the temperature-dependent spectrum increases abnormally between 298 and 373 K,with the luminous intensity at 373 K increasing to 110%of that observed at room temperature.This phenomenon can be attributed to lattice defects in Ba_(2)LaTaO_(6):Eu^(3+),and the phosphor luminous intensity at473 K remains at 80.62%of that at room temperature.In addition,white-light-emitting diode devices based on this novel Ba_(2)LaTaO_(6):0.35Eu^(3+)phosphor were fabricated to evaluate the potential applications of the as-prepared phosphor. | Fadong Li Ruirui Cui Gaofeng Yuan Xin Zhang Min Zhang Chaoyong Deng | 2023 | Journal of Rare Earths2023，41，11： | 0 |
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