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2023 Cross Strait Radio Science and wireless Technology Conference, CSRSWTC 2023

作者： He, Chao Tang, Zhiling Guilin University of Electronic Technology Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin China

ISBN: (纸本)9798350358971

Single-Sided Two-Way Ranging (SS-TWR) is a classic method used for UWB ranging, but it suffers from errors caused by clock asynchrony and measurement noise. Therefore, this paper proposes a solution based on clock compensation and filtering. Firstly, a Markov model is employed to compensate for clock offset-induced errors by adjusting the Time of Flight (ToF) on a frame-by-frame basis. Then, a Kalman particle joint filtering method is used to eliminate measurement noise. Next, a random forest model is built using estimated distance values from simulation experiments. The model is used to predict new estimated distances based on measured values of SS-TWR and correct the coordinate values of Time of Arrival (TOA) positioning. Finally, on one hand, the performance of the ranging algorithm was evaluated by establishing a dynamic distance measurement simulation scenario for road vehicles. The simulation results show that the average error of this ranging method is reduced by about 4.85cm compared to SS-TWR. On the other hand, an indoor positioning environment was set up using four UWB modules to evaluate the performance of the positioning system in a real-world scenario. Analysis of the experimental results shows that the average positioning error of this positioning system is reduced by about 34% compared to TOA positioning based on SS-TWR. © 2023 IEEE.

关键词： Kultra-wideband positioning markov model particle filter random forest single-sided two-way ranging

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Research on Maximum Ratio Combining Detection for MIMO-OTSM

Research on Maximum Ratio Combining Detection for MIMO-OTSM

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2023 Cross Strait Radio Science and wireless Technology Conference, CSRSWTC 2023

作者： Guo, Hailing Tang, Zhiling Guilin University of Electronic Technology Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin China

ISBN: (纸本)9798350358971

Orthogonal time sequency multiplexing (OTSM) is a novel modulation scheme proposed in recent years. It provides higher performance than orthogonal frequency division multiplexing (OFDM) in time-varying channels, similar to the performance of orthogonal time frequency space (OTFS), but with lower complexity than OTFS. Multiple-input multiple-output (MIMO) systems can effectively improve spectral efficiency. Therefore, in this study, we perform data detection in the time domain for MIMO-OTSM systems based on the maximum ratio combining (MRC) principle. The receiver receives signals from different antennas and propagation paths, and uses MRC technology to combine the received signals' after iteration, the signal to interference plus noise ratio (SINR) is maximized. Simulation results show that in a MIMO system, even in high mobile scenarios, OTSM exhibits bit error rate (BER) performance similar to OTFS. Furthermore, the system performance improves with the increase of the number of antennas. © 2023 IEEE.

关键词： detection MIMO MRC OTFS OTSM time domain

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Properties of focused Laguerre–Gaussian beam propagating in anisotropic ocean turbulence

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Chinese Physics B 2024年第2期33卷 386-393页

作者：王新光马洋斌袁邱杰陈伟王乐赵生妹 College of Science Nanjing University of Posts and TelecommunicationsNanjing 210003China Institute of Signal Processing and Transmission Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Lab of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education) Nanjing University of Posts and TelecommunicationsNanjing 210003China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

We analyze the properties of a focused Laguerre–Gaussian(LG)beam propagating through anisotropic ocean turbulence based on the Huygens–Fresnel *** the Rytov approximation theory,we derive the analytical formula of the channel capacity of the focused LG beam in the anisotropic ocean turbulence,and analyze the relationship between the capacity and the light source parameters as well as the turbulent ocean *** is found that the focusing mirror can greatly enhance the channel capacity of the system at the geometric focal plane in oceanic *** results also demonstrate that the communication link can obtain high channel capacity by adopting longer beam wavelength,greater initial beam waist radius,and larger number of transmission ***,the capacity of the system increases with the decrease of the mean squared temperature dissipation rate,temperature-salinity contribution ratio and turbulence outer scale factor,and with the increase of the kinetic energy dissipation rate per unit mass of fluid,turbulence inner scale factor and anisotropy *** to a Hankel–Bessel beam with diffraction-free characteristics and unfocused LG beam,the focused LG beam shows superior anti-turbulence interference properties,which provide a theoretical reference for research and development of underwater optical communication links using focused LG beams.

关键词： vortex beam orbital angular momentum focusing mirror anisotropic turbulence

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Max-Min Rate Optimization in Cell-Free Massive MIMO Systems Using RSMA Scheme

Max-Min Rate Optimization in Cell-Free Massive MIMO Systems ...

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2023 Cross Strait Radio Science and wireless Technology Conference, CSRSWTC 2023

作者： Si, Shunyu Tan, Fangqing Guilin University of Electronic Technology Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin541004 China

ISBN: (纸本)9798350358971

In order to reduce the inter-user interference of the system and increase the throughput of each user, this paper proposes a cell-free massive MIMO system using rate splitting multiple access (RSMA) scheme. In particular, an max-min rate problem is formulated by optimizing the beamforming at access points and rate allocation, and a path following algorithm is proposed to obtain the optimal solution to the problem. Simulation results demonstrate the effectiveness of the proposed model and algorithm in improving the system throughput. © 2023 IEEE.

关键词： beamforming Cell-free massive MIMO non-convex optimization rate splitting multiple access

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Adaptive Orthogonal Basis Scheme for OTFS 17th

Adaptive Orthogonal Basis Scheme for OTFS

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17th International Conference on Communications and networking, ChinaCom 2022

作者： Jia, Yinhua Wang, Sen Jin, Jing Long, Hang Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing100876 China China Mobile Research Institute Beijing China

ISBN: (纸本)9783031347894

Orthogonal time frequency space (OTFS) modulation can provide significant error performance than orthogonal frequency division multiplexing (OFDM) modulation in the high-speed scenario. However, the fractional Doppler effects cause Doppler diffusion. In this paper, we analyze the Doppler diffusion from both the formula and geometric levels. In order to alleviate Doppler diffusion, we propose an adaptive orthogonal basis scheme by using the Doppler shifts feedback of the receiver. Our scheme alter the matrix of the inverse symplectic finite Fourier transform (ISFFT) by the feedback. This scheme makes it possible to estimate the channel more accurately. In the simulation results, we show that the bit error rate (BER) and block error rate (BLER) performance of our proposed scheme is not affected compared with OTFS. In addition, our scheme can work even if the Doppler domain dimension is limited and the Doppler shifts feedback of the receiver is inaccurate. © 2023, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

关键词： Doppler effect

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Complete hyperentangled Greenberger–Horne–Zeilinger state analysis for polarization and time-bin hyperentanglement

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Chinese Physics B 2023年第6期32卷 122-126页

作者：曾志 Institute of Signal Processing and Transmission Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China

We present an efficient scheme for the complete analysis of hyperentangled Greenberger–Horne–Zeilinger(GHZ)state in polarization and time-bin degrees of freedom with two steps. Firstly, the polarization GHZ state is distinguished completely and nondestructively, resorting to the controlled phase flip(CPF) gate constructed by the cavity-assisted interaction. Subsequently, the time-bin GHZ state is analyzed by using the preserved polarization entanglement. With the help of CPF gate and self-assisted mechanism, our scheme can be directly generalized to the complete N-photon hyperentangled GHZ state analysis, and it may have potential applications in the hyperentanglement-based quantum communication.

关键词： hyperentangled state analysis polarization-time-bin hyperentanglement controlled phase flip(CPF)gate

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Differentially Private Federated Stochastic Primal-Dual Learning for Internet of Vehicles

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IEEE Internet of Things Journal 2025年第11期12卷 17034-17050页

作者： Li, Yiwei Wang, Shuai Chang, Tsung-Hui Xiamen University of Technology Fujian Key Laboratory of Communication Network and Information Processing Xiamen361024 China University of Electronic Science and Technology of China National Key Laboratory of Wireless Communications Chengdu611731 China The Chinese University of Hong Kong Shenzhen School of Science and Engineering Shenzhen Research Institute of Big Data Shenzhen518172 China

Federated learning (FL) has the potential to empower Internet-of-Vehicles (IoV) networks by enabling smart vehicles (SVs) to participate in the learning process under the orchestration of a vehicular service provider while keeping data locally. In this paper, we propose a novel federated stochastic primal-dual algorithm with differential privacy (FedSPD-DP) to ensure robust privacy protection for FL based IoV (FL-IoV) systems. The FedSPD-DP algorithm leverages multiple steps of local stochastic gradient descent (SGD) and partial client participation (PCP) to improve communication efficiency while incorporating differential privacy (DP) to ensure privacy protection. Our theoretical analysis explores the impact of these strategies on learning performance. Specifically, we demonstrate that the data sampling strategy and PCP enhance data privacy, while a larger number of local SGD steps may increase privacy leakage, revealing a non-trivial tradeoff between communication efficiency and privacy protection. Extensive experiments on real-world data validate the effectiveness of the proposed algorithm, showing superior performance compared to state-of-the-art FL algorithms, and confirming the analytical results and properties. © 2014 IEEE.

关键词： Federated learning

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77GHz High Gain Antenna Based on Microstrip Coupling Excitation 15

77GHz High Gain Antenna Based on Microstrip Coupling Excitat...

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15th International Conference on Microwave and Millimeter Wave Technology, ICMMT 2023

作者： Zeng, Teng-Xiang Jiang, Xing Chen, Kun-Liang Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin University of Electronic Technology Guangxi Guilin541004 China

ISBN: (纸本)9798350338874

In this paper, a 77GHz high-gain antenna that can be applied to automotive angle radar is proposed. The antenna is composed of two layers of dielectric substrates with the same thickness and the same dielectric constant. The lower layer forms a spatial electromagnetic field by feeding the microstrip line, then, the electromagnetic coupling between the microstrip line and the upper metal patch is used to form an H-plane wide beam. In order to increase the surface current on the metal patch, the gain is improved by connecting the patch and the microstrip line by metallized vias in the upper medium. Finally, the antenna achieves |S11| © 2023 IEEE.

关键词： Microstrip antennas

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Adaptivemulti-layer deployment for a digital-twinempowered satellite-terrestrial integrated network

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Frontiers of Information Technology & Electronic Engineering 2025年第2期26卷 246-259页

作者： Yihong TAO Bo LEI Haoyang SHI Jingkai CHEN Xing ZHANG Wireless Signal Processing and Network Laboratory Beijing University of Posts and TelecommunicationsBeijing 100876China Research Institute of China Telecom Co. Ltd.Beijing 102209China

With the development of satellite communication technology,satellite-terrestrial integrated networks(STINs),which integrate satellite networks and ground networks,can realize global seamless coverage of communication *** the intricacies of network dynamics,the resource heterogeneity,and the unpredictability of user mobility,dynamic resource allocation within networks faces formidable *** twin(DT),as a new technique,can reflect a physical network to a virtual network to monitor,analyze,and optimize the physical ***,in the process of constructing a DT model,the deployment location and resource allocation of DTs may adversely affect its ***,we propose a STIN model,which alleviates the problem of insufficient single-layer deployment flexibility of the traditional edge network by deploying DTs in multi-layer nodes in a *** address the challenge of deploying DTs in the network,we propose a multi-layer DT deployment problem in the STIN to reduce system *** we adopt a multi-agent reinforcement learning(MARL)scheme to explore the optimal strategy of the DT multi-layer deployment *** implemented scheme demonstrates a notable reduction in system delay,as evidenced by simulation outcomes.

关键词： Digital twin Satellite-terrestrial integrated network Deployment Multi-agent reinforcement learning

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Design of LEO-MIMO Precoding Update Algorithm Based on Time Sliding Window 5

Design of LEO-MIMO Precoding Update Algorithm Based on Time ...

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5th International Conference on Electronic Communication and Artificial Intelligence, ICECAI 2024

作者： Hu, Zewei Zheng, Lin Yang, Chao School of Information and Communication Guilin University of Electronic Technology Guilin541004 China Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing Guilin541004 China

ISBN: (纸本)9798350386943

In the Low Earth Orbit (LEO) satellite Internet of Things (IoT), there is a significant imbalance in the distribution of ground terminal locations. Under a fixed beam regime, this leads to scenarios where satellite network capacity is simultaneously overloaded and underutilized, resulting in low capacity utilization rates for LEO satellite-to-earth communications. Distributed LEO-MIMO (Low Earth Orbit-Multiple Input Multiple Output) can alleviate overloads and distribute capacity by extending the satellite beam coverage area. However, unlike terrestrial distributed MIMO, which faces co-channel interference issues, distributed satellite networking in LEO systems also deals with the heterogeneity of Doppler shifts across different satellite links. To address these issues, a distributed LEO-MIMO linear precoding update algorithm is proposed. This paper, utilizing spectral graph theory, reduces the problem of constructing a single-frame precoding matrix to a graph signal correlation calculation problem. We introduce a precoding solving algorithm based on a time sliding window, which enhance data processing efficiency and reduce communication latency. © 2024 IEEE.

关键词： Satellite links

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