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Low-complexity APSK demodulation algorithm based on K-means clustering in LEO satellite communication systems 认领 引用
1
作者 Guangfu Wu Xiangrui Meng +1 位作者 Changlin Chen Biqun Xiang 《Digital Communications and Networks》 SCIE EI CSCD 2026年第2期343-353,共11页
Amplitude Phase Shift Keying(APSK)is more suitable for the nonlinear channels of Low Earth Orbit(LEO)satellite communication systems compared to Quadrature Amplitude Modulation(QAM).To tackle challenges posed by Direc... Amplitude Phase Shift Keying(APSK)is more suitable for the nonlinear channels of Low Earth Orbit(LEO)satellite communication systems compared to Quadrature Amplitude Modulation(QAM).To tackle challenges posed by Direct Current(DC)interference and high demodulation complexity,we propose an APSK demodulation algorithm based on K-means clustering.Initially,static DC components are calculated and removed from the received APSK signals.Subsequently,the estimated APSK constellation points serve as initial centers for K-means clustering.These centers are refined through the K-means process and act as theoretical APSK constellation points for the Max-Log-MAP demodulation algorithm,effectively eliminating residual DC.We then introduce a low-complexity APSK demodulation algorithm that utilizes the symmetry of constellation points along with the Euclidean distance between DC-eliminated signals and these constellation points to minimize the set of constellation points.Simulation results indicate that for 32-APSK,our proposed demodulation submodule reduces computational complexity to approximately one-third that of the Max-Log-MAP algorithm while improving Bit Error Rate(BER)performance by about 0.23 dB.Furthermore,end-to-end simulation experiments conducted within LEO satellite communication systems demonstrate that our approach not only maintains this complexity advantage but also enhances BER performance by approximately 1.1 dB. 展开更多
关键词 DC elimination APSK demodulation LEO satellite communication K-means algorithm Max-Log-MAP algorithm
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Two User Cooperative Secure Satellite Communication Based on WFRFT 认领 引用
2
作者 Zhang Tong Fang Xiaojie +1 位作者 Sha Xuejun Wang Ding 《China Communications》 SCIE EI CSCD 2026年第4期214-226,共13页
This paper proposes a two-user cooperative physical layer security(PLS)satellite transmission scheme based on the weighted fractional fourier transform(WFRFT).This approach achieves energyefficient secure transmission... This paper proposes a two-user cooperative physical layer security(PLS)satellite transmission scheme based on the weighted fractional fourier transform(WFRFT).This approach achieves energyefficient secure transmission in two-way satellite relay by superimposed WFRFT signals with different orders between cooperative users.The Gaussian-like characteristics of the superimposed WFRFT signals with order differences make them inseparable,preventing eavesdroppers from obtaining the correct transform order for computational attacks,thereby enhancing the resistance to computational analysis.Meanwhile,the signals from the two cooperative users form equivalent strong artificial noise(AN)to each other,reducing eavesdropping channel capacity,and WFRFT parameter errors further reduce the eavesdropping channel capacity.As a result,the proposed scheme improves secrecy capacity and secrecy energy efficiency(SEE)without consuming additional interference power.Based on the Gaussianity of the superimposed signal,an order selection method for the cooperative users is provided.The PLS performance of the proposed scheme is analyzed,and expressions for the secrecy capacity and SEE are derived.Simulation results are provided to validate the performance of the proposed method. 展开更多
关键词 cooperative transmission Physical layer security satellite communication secrecy energy efficiency WFRFT
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Bayesian Blind Multiple Signals Localization for NGSO Satellite Communications 认领 引用
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作者 Liu Yilun Teng Boyu Yuan Xiaojun 《China Communications》 SCIE EI CSCD 2026年第2期69-84,共16页
The acquisition of position information of legitimate users and jammers plays an important role in the emerging non-geostationary synchronous orbit(NGSO)satellite communications.In this paper,we study the multi-signal... The acquisition of position information of legitimate users and jammers plays an important role in the emerging non-geostationary synchronous orbit(NGSO)satellite communications.In this paper,we study the multi-signal localization problem in an uplink NGSO satellite communication system.We propose an onboard localization scheme based on multiple observations from the satellite,together with the geometric constraints of the satellite postions,the signal positions,the attitude of the satellite,and the angle-of-arrival(AoAs)of the signals.We develop a massage-passing algorithm,termed the Bayesian blind multi-signal localization(BMSL),to jointly estimate the AoAs and the signal positions.The Cramér-Rao lower bound(CRLB)is derived to characterize the fundamental performance limit of the considered localization problem.Simulation results show that the proposed BMSL algorithm can perform close to the derived CRLB and significantly outperforms its counterpart algorithms. 展开更多
关键词 AoA estimation message passing multisignal localization satellite communications
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Multiview Grouping-Assisted Downlink Transmission Optimization for NOMA LEO Satellite Communication System 认领 引用
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作者 Yang Jingli Cen Yi +1 位作者 Wang Ke Cen Yigang 《China Communications》 SCIE EI CSCD 2026年第5期300-316,共17页
Low earth orbit satellite communication systems(LEO-SCS)have gained significant attention as a crucial component of future space-terrestrial integrated networks.This paper explores the application of non-orthogonal mu... Low earth orbit satellite communication systems(LEO-SCS)have gained significant attention as a crucial component of future space-terrestrial integrated networks.This paper explores the application of non-orthogonal multiple access(NOMA)in downlink transmission for LEO-SCS,addressing a joint problem of user grouping,beamforming,and power allocation.This problem can be formulated as a system sum rate(SSR)maximization problem,subject to constraints as the minimum transmission rate requirement for each user equipment(UE),the satellite’s total power budget,and the positions of the UEs.To tackle this non-convex problem,we propose a multiview-aided multibeam multiuser grouping(MVA-MBMUG)scheme.Specifically,we first define the grouping problem as a multiview grouping problem,in which all UEs are divided into multiple groups.These groups are designed to achieve optimal performance with respect to both the downlink channel vectors and the locations of each UE simultaneously.Next,we introduce a low-complexity multicast beamforming technique that effectively mitigates inter-group interference.Finally,by employing a fast water-filling algorithm for power allocation,we optimize the SSR by determining the optimal power distribution for each UE.Simulation results demonstrate that the proposed MVA-MBMUG scheme in NOMA-based LEO-SCS significantly outperforms other benchmark algorithms in terms of SSR. 展开更多
关键词 beamforming LEO satellite communication system multiview grouping NOMA power allocation
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Evolution of Satellite Communication Systems Toward 5G/6G for 2030 and Beyond 认领 引用
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作者 Afang Yuan Zhihua Yang Zhili Sun 《Engineering》 SCIE EI CSCD 2025年第11期35-41,共7页
1.Introduction From the first-generation(1G)through the second-generation(2G)Global System for Mobile Communications(GSM),the third-generation(3G)wideband code division multiple access(WCDMA)to the fourth-generation(4... 1.Introduction From the first-generation(1G)through the second-generation(2G)Global System for Mobile Communications(GSM),the third-generation(3G)wideband code division multiple access(WCDMA)to the fourth-generation(4G)long-term evolution(LTE)wireless networks,terrestrial networks(TNs)have demonstrated significant success in increasing communication speeds and improving quality of service(QoS)for users. 展开更多
关键词 communication speeds G satellite communication evolution code division multiple access wcdma system mobile communications gsm networksterrestrial networks tns quality service
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Resource Allocation for Emergency Communications in Distribution Network Satellite Communication System 认领 引用
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作者 Xie Haoran Zhan Yafeng Fang Xin 《China Communications》 SCIE EI CSCD 2025年第2期95-111,共17页
Frequent extreme disasters have led to frequent large-scale power outages in recent years.To quickly restore power,it is necessary to understand the damage information of the distribution network accurately.However,th... Frequent extreme disasters have led to frequent large-scale power outages in recent years.To quickly restore power,it is necessary to understand the damage information of the distribution network accurately.However,the public network communication system is easily damaged after disasters,causing the operation center to lose control of the distribution network.In this paper,we considered using satellites to transmit the distribution network data and focus on the resource scheduling problem of the satellite emergency communication system for the distribution network.Specifically,this paper first formulates the satellite beam-pointing problem and the accesschannel joint resource allocation problem.Then,this paper proposes the Priority-based Beam-pointing and Access-Channel joint optimization algorithm(PBAC),which uses convex optimization theory to solve the satellite beam pointing problem,and adopts the block coordinate descent method,Lagrangian dual method,and a greedy algorithm to solve the access-channel joint resource allocation problem,thereby obtaining the optimal resource scheduling scheme for the satellite network.Finally,this paper conducts comparative experiments with existing methods to verify the effec-tiveness of the proposed methods.The results show that the total weighted transmitted data of the proposed algorithm is increased by about 19.29∼26.29%compared with other algorithms. 展开更多
关键词 distribution network emergency communication resource scheduling satellite communication
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Interference Suppression Based on Angular Reciprocity and Covariance Matrix Reconstruction in Satellite Communication Systems 认领 引用
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作者 Luo Jie Fan Jiancun +2 位作者 Liu Hongji Luo Xinmin Jiao Libin 《China Communications》 SCIE EI CSCD 2025年第11期40-49,共10页
Satellite communication plays an important role in 6G systems.However,satellite communication systems are more susceptible to intentional or unintentional interference signals than other communication systems because ... Satellite communication plays an important role in 6G systems.However,satellite communication systems are more susceptible to intentional or unintentional interference signals than other communication systems because of their working mechanism of transparent forwarding.For the purpose of eliminating the influence of interference,this paper develops an angle reciprocal interference suppression scheme based on the reconstruction of interferenceplus-noise covariance matrix(ARIS-RIN).Firstly,we utilize the reciprocity between the known beam central angle and the unknown signal arrival angle to estimate the angle of arrival(AOA)of desired signal due to the multi-beam coverage.Then,according to the priori known spatial spectrum distribution,the interferenceplus-noise covariance matrix(INCM)is reconstructed by integrating within the range except the direction of desired signal.In order to correct the estimation bias of the first two steps,the worst-case performance optimization technology is adopted in the process of solving the beamforming vector.Numerical simulation results show that the developed scheme:1)has a higher output signal-to-interference-plus-noise ratio(SINR)under arbitrary signal-to-noise ratio(SNR);2)still has good performance under small snapshots;3)is robuster and easier to be realized when comparing with minimum variance distortionless response(MVDR)and the traditional diagonal loading algorithms. 展开更多
关键词 angle reciprocity covariance matrix reconstruction interference suppression satellite communications worst-case performance optimization
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Sensing-Aided Hierarchical Beam Search in Low Earth Orbit Satellite Communications 认领 引用
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作者 Jiahui He Mengxin Yang Yixiao Gu 《Journal of Beijing Institute of Technology》 EI CAS 2025年第3期268-277,共10页
Low earth orbit(LEO)satellite communication which can provide global wireless ser-vice plays a critical role in the future wireless communication networks.However,due to the high speed of satellite motion,numerous nar... Low earth orbit(LEO)satellite communication which can provide global wireless ser-vice plays a critical role in the future wireless communication networks.However,due to the high speed of satellite motion,numerous narrow beams,and complex satellite-terrestrial channels,the initial access between the LEO satellites and user terminals(UEs)becomes more complicated.To establish a stable link,a beam search is required between the satellite and the UE.However,tradi-tional beam search methods(e.g.,exhaustive search)have high time complexity which is not suit-able in high-speed scenarios.Therefore,in this paper,a sensing-aided hierarchical beam search method is proposed,which is performed in two stages.In the first stage,wide beam scanning is per-formed to find the optimal angular range.In the second stage,after determining the directions of narrow beams via sensing the direction of arrival(DOA)of satellite signals,the narrow beams gen-erated at estimated directions are used to sweep the satellite beams.This method can help fast beam alignment and obtain high beam search accuracy,which is verified by simulation results.Moreover,we analyze the gain of beam alignment from the two-stage beam search method. 展开更多
关键词 low earth orbit satellite communication beam search initial access sensing-aided communication
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System Integration of Terrestrial Mobile Communication and Satellite Communication——The Trends, Challenges and Key Technologies in B5G and 6G 认领 引用 被引量：133
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作者 Shanzhi Chen Shaohui Sun Shaoli Kang 《China Communications》 SCIE CSCD 2020年第12期156-171,共16页
Mobile communication standards have been developed into a new era of B5G and 6G.In recent years,low earth orbit(LEO)satellites and space Internet have become hot topics.The integrated satellite and terrestrial systems... Mobile communication standards have been developed into a new era of B5G and 6G.In recent years,low earth orbit(LEO)satellites and space Internet have become hot topics.The integrated satellite and terrestrial systems have been widely discussed by industries and academics,and even are expected to be applied in those huge constellations in construction.This paper points out the trends of two stages towards system integration of the terrestrial mobile communication and the satellite communications:to be compatible with 5G,and to be integrated within 6G.Based on analysis of the challenges of both stages,key technologies are thereafter analyzed in detail,covering both air interface currently discussed in 3GPP for B5G and also novel network architecture and related transmission technologies toward future 6G. 展开更多
关键词 satellite communication terrestrial mobile communication system integration B5G 6G space internet
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Joint Computing and Communication Resource Allocation for Satellite Communication Networks with Edge Computing 认领 引用 被引量：28
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作者 Shanghong Zhang Gaofeng Cui +1 位作者 Yating Long Weidong Wang 《China Communications》 SCIE EI CSCD 2021年第7期236-252,共17页
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-int... 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. 展开更多
关键词 satellite communication networks edge computing resource allocation matching theory
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Multi-Objective Deep Reinforcement Learning Based Time-Frequency Resource Allocation for Multi-Beam Satellite Communications 认领 引用 被引量：15
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作者 Yuanzhi He Biao Sheng +2 位作者 Hao Yin Di Yan Yingchao Zhang 《China Communications》 SCIE CSCD 2022年第1期77-91,共15页
Resource allocation is an important problem influencing the service quality of multi-beam satellite communications.In multi-beam satellite communications, the available frequency bandwidth is limited, users requiremen... Resource allocation is an important problem influencing the service quality of multi-beam satellite communications.In multi-beam satellite communications, the available frequency bandwidth is limited, users requirements vary rapidly, high service quality and joint allocation of multi-dimensional resources such as time and frequency are required. It is a difficult problem needs to be researched urgently for multi-beam satellite communications, how to obtain a higher comprehensive utilization rate of multidimensional resources, maximize the number of users and system throughput, and meet the demand of rapid allocation adapting dynamic changed the number of users under the condition of limited resources, with using an efficient and fast resource allocation algorithm.In order to solve the multi-dimensional resource allocation problem of multi-beam satellite communications, this paper establishes a multi-objective optimization model based on the maximum the number of users and system throughput joint optimization goal, and proposes a multi-objective deep reinforcement learning based time-frequency two-dimensional resource allocation(MODRL-TF) algorithm to adapt dynamic changed the number of users and the timeliness requirements. Simulation results show that the proposed algorithm could provide higher comprehensive utilization rate of multi-dimensional resources,and could achieve multi-objective joint optimization,and could obtain better timeliness than traditional heuristic algorithms, such as genetic algorithm(GA)and ant colony optimization algorithm(ACO). 展开更多
关键词 multi-beam satellite communications time-frequency resource allocation multi-objective optimization deep reinforcement learning
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A Stackelberg Differential Game Based Bandwidth Allocation in Satellite Communication Network 认领 引用 被引量：16
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作者 Jingtao Su Shengsong Yang +1 位作者 Haitao Xu Xianwei Zhou 《China Communications》 SCIE CSCD 2018年第8期205-214,共10页
In this paper, a Stackelberg differential game based approach is proposed to solve the bandwidth allocation problems in satellite communication network. All the satellites are divided into two groups, one has high dow... In this paper, a Stackelberg differential game based approach is proposed to solve the bandwidth allocation problems in satellite communication network. All the satellites are divided into two groups, one has high download requirements, and the other one has low download requirements. Each satellites group has its own controller for bandwidth allocation, and can get payments from the satellites for the allocated resources. The relationships between the controllers and satellites are formed as a Stackelberg game. In our model, differential equation is introduced to describe the bandwidth dynamics for the whole satellite communication network. Combine the differential equation and Stackelberg game together, we can formulate the bandwidth allocation problems in satellite communication network as a Stackelber differential game. The solutions to the proposed game is solved based the Bellman dynamic equations. Numerical simulations are given to prove the effeteness and correctness of the proposed approach. 展开更多
关键词 stackelberg equilibrium bandwidth allocation differential game satellite communication networks
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Reliability Evaluation of All-User Terminals in LEO Satellite Communication Network Based on Modular Reduction 认领 引用 被引量：3
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作者 Yangyang Du Sifeng Liu +1 位作者 Zhigeng Fang Su Gao 《China Communications》 SCIE CSCD 2022年第2期235-246,共12页
LEO satellite communication network has a large number of satellites distributed in low orbits,which leads to multiple coverage of many areas on the ground.It is hard work to describe and evaluate the reliability of L... LEO satellite communication network has a large number of satellites distributed in low orbits,which leads to multiple coverage of many areas on the ground.It is hard work to describe and evaluate the reliability of LEO satellite communication network.To solve this problem,the reliability of all-user terminals in LEO satellite communication network is defined,and the corresponding reliability evaluation method is proposed in the paper.Due to the large scale of the interstellar network,a modular reduction algorithm using the modular network instead of the original network for state decomposition is proposed in this paper.Case study shows that the calculation time of the proposed method is equivalent to 6.28%of the original state space decomposition algorithm.On this basis,the reliability of LEO satellite communication network is further analyzed.It is found that the reliability of LEO satellite network was more sensitive to the reliability of Inter-Satellite link and the satisfaction of global coverage in the early stage,and it is more sensitive to the reliability of the satellite in the later stage.The satellite-ground link has a relatively constant impact on of LEO satellite network. 展开更多
关键词 reliability evaluation LEO satellite communication network modular approach full probability formula all-user terminals
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A Joint Encryption and Error Correction Method Used in Satellite Communications 认领 引用 被引量：4
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作者 LI Ning LIN Kanfeng +1 位作者 LIN Wenliang DENG Zhongliang 《China Communications》 SCIE CSCD 2014年第3期70-79,共10页
Due to the ubiquitous open air links and complex electromagnetic environment in the satellite communications,how to ensure the security and reliability of the information through the satellite communications is an urg... Due to the ubiquitous open air links and complex electromagnetic environment in the satellite communications,how to ensure the security and reliability of the information through the satellite communications is an urgent problem.This paper combines the AES(Advanced Encryption Standard) with LDPC(Low Density Parity Check Code) to design a secure and reliable error correction method — SEEC(Satellite Encryption and Error Correction).This method selects the LDPC codes,which is suitable for satellite communications,and uses the AES round key to control the encoding process,at the same time,proposes a new algorithm of round key generation.Based on a fairly good property in error correction in satellite communications,the method improves the security of the system,achieves a shorter key size,and then makes the key management easier.Eventually,the method shows a great error correction capability and encryption effect by the MATLAB simulation. 展开更多
关键词 data encryption error correctingcipher advanced encryption standard LDPCchannel coding satellite communications
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Adaptive robust control of mobile satellite communication system with disturbance and model uncertainties 认领 引用 被引量：3
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作者 Jun Jiang Jian Guo +1 位作者 Bin Yao Qingwei Chen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第5期761-767,共7页
The tracking and stable control of a typical shipmounted mobile satellite communication system（MSCS） is studied.Unlike the former studies based on simplified single-axis models,a tri-axis nonlinear model including t... The tracking and stable control of a typical shipmounted mobile satellite communication system（MSCS） is studied.Unlike the former studies based on simplified single-axis models,a tri-axis nonlinear model including the kinematic and dynamic features of the MSCS is used as the control object.An adaptive robust controller with trajectory planning is designed to deal with large parametric uncertainties and uncertain nonlinearities of the system.A theoretic performance result is given and proved.The designed adaptive robust controller and other two traditional controllers are tested in the comparative simulations under three different situations.The simulation results show the tracking and stable validity of the proposed controller. 展开更多
关键词 ship-mounted mobile satellite communication system adaptive control robust control tracking control
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Efficient Single Event Upset-Tolerant FIR Filter Design Based on Residue Number for OBP Satellite Communication Systems 认领 引用 被引量：1
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作者 GAO Zhen Pedro Reviriego +2 位作者 ZHAO Ming WANG Jing Juan Antonio Maestro 《China Communications》 SCIE CSCD 2013年第8期55-67,共13页
Cosmic radiation has several effects on the On-Board Processing(OBP)platform in satellite communications systems,and Single Event Upsets(SEUs)are one of its most important effects.In order to protect the Finite Impuls... Cosmic radiation has several effects on the On-Board Processing(OBP)platform in satellite communications systems,and Single Event Upsets(SEUs)are one of its most important effects.In order to protect the Finite Impulse Response(FIR)filters against SEU,this paper proposes a novel Residue Number(RN)-based method.The proposed method applies the transpose form of the FIR filter to avoid the fault missing caused by SEU on shift registers.It also adjusts the input intelligently to avoid the fault missing caused by SEU on the filter coefficients.After all the fault missing events are avoided,the modulus can be minimised to achieve the minimum overhead.Theoretical analysis and simulation results show that the noise introduced by the input adjustment is negligible.Fault injection shows that the fault missing rate of the proposed method is zero.Finally,FPGA implementation shows that the overhead of the proposed method is approximately 75%of Triple Modular Redundancy,and is only 1%-2%higher than that of the traditional RN-based design. 展开更多
关键词 satellite communication fault-tolerant design FIR filter SEU residue number based OBP
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Edge Intelligence Assisted Resource Management for Satellite Communication 认领 引用 被引量：3
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作者 Yaohua Sun Mugen Peng 《China Communications》 SCIE CSCD 2022年第8期31-40,共10页
Satellite communication has been seen as a vital part of the sixth generation communication,which greatly extends network coverage.In satellite communication,resource management is a key problem attracting many resear... Satellite communication has been seen as a vital part of the sixth generation communication,which greatly extends network coverage.In satellite communication,resource management is a key problem attracting many research interests.However,previous study mainly focuses on throughput improvement via power allocation and spectrum assignment and the proposed approaches are mostly model-based and dedicated to specific problem structures.Fortunately,with the trend of edge intelligence,complex resource management problems can be efficiently resolved in a model-free manner.In this paper,a joint beam activation,user-beam association and time resource allocation approach is proposed.The core idea is using stochastic learning at the ground station to identify active user-link beams to meet user rate demand.In addition,the convergence,optimality and complexity of our proposal are rigorously discussed.By simulation,it is shown that the rate goal of most of the users can be met and meanwhile satellite energy is saved owing to much less active beams. 展开更多
关键词 satellite communication resource management stochastic learning
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Frequency Offset Compensation for Satellite Communication System with CE-OFDM 认领 引用 被引量：3
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作者 Gaofeng Cui Cheng Wang +1 位作者 Weidong Wang Yinghai Zhang 《China Communications》 SCIE CSCD 2017年第8期93-104,共12页
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, ... 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). 展开更多
关键词 CE-OFDM carrier frequency offset null subcarrier satellite communication
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Study of High-Temperature Superconductor Diplexers for Satellite Communications 认领 引用 被引量：1
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作者 刘娟秀 羊恺 +3 位作者 罗正祥 补世荣 宁俊松 张天良 《Journal of Electronic Science and Technology of China》 2005年第3期260-263,共4页
The high-temperature superconductor （HTSC） resonator and diplexer are simulated by full-wave tools. A newly developed miniature HTSC diplexer is designed and fabricated on double sided YBa2Cu3O7 （YBCO） film （YBCO... The high-temperature superconductor （HTSC） resonator and diplexer are simulated by full-wave tools. A newly developed miniature HTSC diplexer is designed and fabricated on double sided YBa2Cu3O7 （YBCO） film （YBCO/LaAlO3/YBCO）, the thickness of which is 400 nm for YBCO and 0.5 mm for the LaAlO3. The measured results show a good agreement with the simulation. The volume and mass of the diplexers are greatly reduced by miniaturized configuration. 展开更多
关键词 high-temperature superconductor microwave diplexer satellite communication
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A NOVEL MODULATION FOR MOBILE SATELLITE COMMUNICATIONS 认领 引用 被引量：1
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作者 Xie Zhidong Bian Dongming Hu Jing Sun Qian 《Journal of Electronics(China)》 2011年第2期174-180,共7页
It is a challenging problem to design a high performance modulation for mobile satellite communications due to the limited power and bandwidth resource.The paper improves Feher patented Quadrature Phase Shift Keying(F... It is a challenging problem to design a high performance modulation for mobile satellite communications due to the limited power and bandwidth resource.The paper improves Feher patented Quadrature Phase Shift Keying(FQPSK) by redefining the waveform.The novel FQPSK,with con-stant envelope,can be used to improve the power efficiency and frequency efficiency of mobile satellite communication.The study shows that the improved FQPSK outperforms conventional FQPSK over AWGN and is immune to the non-linearity of high power amplifier.At last,the impact of flat fading and multi-path fading of channel on the BER performance of improved modulation is analyzed. 展开更多
关键词 Mobile satellite communication Modulation Feher Quadrature Phase Shift Keying(FQPSK) Fading
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