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15th IEEE International Conference on Wireless Communications and Signal Processing, WCSP 2023

作者： Guo, Minan Jia, Bowen Feng, Chunyan Zhu, Zhiyu Yang, Yang Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing100876 China China Electronics Standardization Institute Beijing100176 China Beijing University of Posts and Telecommunications Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing100876 China

ISBN: (纸本)9798350324662

Visible light positioning (VLP) has attracted considerable interest due to its high accuracy and low cost. However, VLP typically requires several light emitting diodes (LEDs) for positioning, which may lead to positioning failure in sparse LED layout or parts of the links are blocked. To address this challenge, we propose a novel graph optimization-based localization algorithm by fusing VLP and visual odometry (VO), termed GO-VLO. In the considered model, a few LEDs are deployed on the ceiling and broadcast positioning information, while a receiver equipped with a camera conducts GO-VLO to achieve precise positioning with limited LEDs. GO-VLO consists of a front end to process positioning information and a back end to further optimize the positioning results. In particular, VLP and VO are first used separately at the front end, thus obtaining two respective positioning results. Then, a visible-light visual odometry fusion mechanism is proposed to fuse the positioning results of VLP and VO preliminarily. To strengthen the constraints between frames and prevent location failure when VLP is unavailable, a novel graph optimization framework is further proposed in the back end, which notably takes the covisible feature points of two successive frames into consideration. Experimental results show that our proposed method attains a positioning accuracy of 4.93 cm in two dimension and 6.20 cm in three dimension under dense LED layout. © 2023 IEEE.

关键词： pose graph SLAM visible light positioning visual positioning

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Research on Mobile network High-precision Absolute Time Synchronization based on TAP

arXiv

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arXiv 2024年

作者： Zhang, Chenyu Wen, Xiangming Zheng, Wei Yu, Longdan Lu, Zhaoming Wang, Zhengying The Beijing Laboratory of Advanced Information Networks Beijing Key Lab of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

With the development of mobile communication and industrial internet technologies, the demand for robust absolute time synchronization based on network for diverse scenarios is significantly growing. TAP is a novel network timing method that aims to achieve sub-microsecond synchronization over air interface. This paper investigates the improvement and end-to-end realization of TAP. This paper first analyzes the effectiveness and deficiencies of TAP by establishing an equivalent clock model which evaluates TAP from timing error composition and allan variance. Second, this paper proposes a detailed base station and terminal design and the corresponding improvement of TAP. Both hardware compensation and protocol software design are taken into account so as to minimize timing error and system cost while maximizing compatibility with 3GPP. Finally, this paper presents a TAP end-to-end 5G prototype system developed based on software defined radio base station and COTS baseband module. The field test results show that the proposed scheme effectively solves the problems of TAP in application and robustly achieves 200ns level timing accuracy in various situations. The average accuracy with long observations can reach 1 nanosecond. It is 2∼3 orders of magnitude better than common network timing methods, including NTP, PTP and the original TAP. Copyright © 2024, The Authors. All rights reserved.

关键词： Wireless networks

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Joint Optimization of Transit Signal Priority and Safety-Critical Longitudinal Control of Connected Autonomous Vehicles

Joint Optimization of Transit Signal Priority and Safety-Cri...

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IEEE Conference on Wireless Communications and networking

作者： Sirui Li Chengyu Wang Luhan Wang Zhaoming Lu Wenpeng Jing Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Beijing Laboratory of Advanced Information Networks Beijing China Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350303582

ISBN: (纸本)9798350303599

Transit signal priority (TSP) is an effective strategy to enhance the operational efficiency of buses and increase bus ridership. Nonetheless, existing TSP strategies seldom utilize connected information to control buses collaboratively and take safety into consideration. In this paper, we propose a method that combines signal timing optimization with longitudinal control of Connected and Autonomous Vehicles (CAVs) to improve efficiency and comfort for passengers while ensuring safety. This method modifies signal timing at isolated intersections to prioritize buses as well as controls the delayed CAV bus to catch the green light smoothly and cooperatively change lanes based on Vehicle-to-Everything (V2X) communication. Moreover, the Control Barrier Functions are used as safety-critical constraints in Model Predictive Control to avoid collisions. The effectiveness of the proposed method is evaluated in comparative analyses against controllers without TSP or longitudinal control in CARLA. The simulation results reveal that the proposed method reduces waiting time at intersections and velocity fluctuations while maintaining a safe following distance.

关键词： Fluctuations Connected vehicles Simulation Optimization methods Safety Delays Vehicle-to-everything

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Hybrid Beamforming Design for Wideband Near-Field ISAC with Delay Alignment Modulation

Hybrid Beamforming Design for Wideband Near-Field ISAC with ...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Xuanrui Zhang Wan Xiang Yawen Chen Wei Zheng Zhaoming Lu Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Beijing Laboratory of Advanced Information Networks Beijing China Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350390643

ISBN: (纸本)9798350390650

This paper studies a multi-user integrated sensing and communication (ISAC) system with delay alignment modulation (DAM) in the near-field. We aim to optimize multi-path hybrid beamforming so as to maximize the signal-to-noise ratio (SNR) of the target echo while ensuring communication users' signal-to-interference plus-noise ratio (SINR) requirements and transmit power budget. To this end, we propose an alternating optimization algorithm using successive convex approximation (SCA) technology, penalty convex-concave procedure (PCCP) and second-order cone programming (SOCP). Simulation results demonstrate the effectiveness of the proposed algorithm and show the impact of channel model mismatch and the distance dimension introduced by the near-field model on the near-field DAM-ISAC system.

关键词： Array signal processing Dams Simulation Signal processing algorithms Modulation Interference Integrated sensing and communication Approximation algorithms Delays Signal to noise ratio

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Radio Simultaneous Localization and Mapping with Moving Object Tracking in Dynamic Environments

Radio Simultaneous Localization and Mapping with Moving Obje...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Xue Lv Wan Xiang Yawen Chen Zhaoming Lu Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Beijing Laboratory of Advanced Information Networks Beijing China Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350362244

ISBN: (纸本)9798350362251

Generation (5G) mobile communication provides high-resolution measurements of delays and angles, which make radio simultaneous localization and mapping (SLAM) a possibility. Current radio SLAM systems focus on static environments. However, moving objects may degrade the performance of SLAM systems. In this paper, we propose an integrated radio SLAM and moving object tracking scheme for dynamic environments. Specifically, we first use a grid-based object detection method to detect and filter out measurements belonging to the multipath components (MPCs) of moving objects for accurate radio SLAM. After obtaining the precise vehicle position via SLAM, a curve fitting method is used to track and predict the trajectories of the moving objects, and the prediction results will help in the detection of the object at the next moment. Finally, simulation results demonstrate the performance of the proposed scheme.

关键词： Location awareness Simultaneous localization and mapping Accuracy Simulation Current measurement Noise Object detection Trajectory Object tracking Vehicle dynamics

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FLIT: Multidimensional Data Fusion Localization system Based on Vision Transformer in Single Base Station Mode

FLIT: Multidimensional Data Fusion Localization System Based...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Jingyi Du Luhan Wang Zhaoming Lu Haiwen Niu Xiangming Wen Beijing University of Posts and Telecommunications Beijing China Beijing Laboratory of Advanced Information Networks Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing China

ISBN: (数字)9798350362244

ISBN: (纸本)9798350362251

With the rapid development of 5th Generation Mobile Communication Technology (5G), the increased bandwidth not only bolsters communication efficiency but also paves the way for high-precision location-based services within these industrial applications. Positioning by using a single base station (BS) possesses potential vital values in scenarios that multiple BSs are not applicable, such as unmanned aerial vehicle assisted emergency communication scenarios, dynamic and temporary industrial 5G scenarios, etc. However, due to a lack of observed measurements from different base stations, the high accurate and stable positioning by using a single BS faces challenges. To address this problem, this paper introduces a novel approach utilizing the open-source 5G platform OpenAirInterface (OAI) to design application programming interfaces (APIs) for accessing low layer data. By extracting data directly from actual protocol stacks, we have developed a multidimensional data fusion localization system based on Vision Transformer (ViT) in a single-BS mode named FLIT. Conducted within an office setting, our experiments spanned a 100MHz bandwidth, culminating in a system capable of achieving an average positioning error of just 6.9cm, with 90% of measurements within a 9cm error margin and 80% within 5.3cm, thus attaining centimeter-level accuracy in positioning.

关键词： Location awareness Base stations Computer vision Accuracy 5G mobile communication Data integration Bandwidth Position measurement Transformers Vehicle dynamics

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Joint antenna position and transmit signal optimization for ISAC system with movable antenna array

Joint antenna position and transmit signal optimization for ...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Wan Xiang Yawen Chen Xuanrui Zhang Zhaoming Lu Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing China Beijing Laboratory of Advanced Information Networks Beijing China Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350362244

ISBN: (纸本)9798350362251

This paper studies an integrated sensing and communication (ISAC) system with movable antennas (MAs), where the position of antennas can be flexibly adjusted to reshape the wireless channel. We aim at jointly optimizing the positions of MAs, beamforming of the communication signal, and the covariance of the sensing signal to maximize the overall transmit beampattern gain while ensuring the quality of communication service requirement. Considering the non-convexity of this optimization problem, we propose an efficient algorithm to obtain a high-quality solution by using alternating optimization, semi-definite relaxation (SDR) and Taylors theorem. The simulation results show that the proposed algorithm significantly improves the beampattern gain.

关键词： Wireless communication Wireless sensor networks Simulation Transmitting antennas Mobile antennas Integrated sensing and communication Optimization Signal design Antenna arrays Signal to noise ratio

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Research on Performance Enhancement of OAM system Based on Adaptive Beam Steering Approach

Research on Performance Enhancement of OAM System Based on A...

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International Conference on Microwave and Millimeter Wave Technology Proceedings

作者： Lijin Wang Yu Sun Weijun Hong Beijing Laboratory of Advanced Information Network Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China The Radio Monitoring Station of Heilongjiang Province Heilongjiang China

ISBN: (数字)9798350389968

ISBN: (纸本)9798350389975

The communication based on orbital angular momentum (OAM) can solve the problem of the shortage of spectrum resources caused by the increase of multimedia transmission demand. However, the non-alignment of the OAM antenna will lead to the serious deterioration of system performance. Currently, the performance research of the unaligned OAM system mainly focuses on simulation studies and lacks investigation in actual transmission scenarios. In this paper, a OAM communication testing bed based on software radio (SDR) is designed. To tackle the performance degradation issue caused by non-alignment, we implement a beam steering approach on the experimental setting for the first time. The experimental results demonstrate that the proposed algorithm achieved significant improvement in the system's performance. Specifically, the transmission packet loss rate decreases from 99.9% to 1.7% when the tilt angle is 25°.

关键词： Degradation Beam steering system performance Transmitting antennas Software algorithms Receiving antennas Adaptive arrays

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Accurate Positioning with Single Vision Beacon: A Spatial Geometry Based Algorithm 15

Accurate Positioning with Single Vision Beacon: A Spatial Ge...

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15th IEEE International Conference on Wireless Communications and Signal Processing, WCSP 2023

作者： Yang, Boyu Yang, Yang Guo, Caili Zhu, Zhiyu Wang, Xuefei Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing100876 China Beijing University of Posts and Telecommunications Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing100876 China China Spacesat Co. Ltd Beijing100876 China

ISBN: (纸本)9798350324662

This paper proposes a visual positioning algorithm based on feature points and triangular structures on a quick response code (V-FTQ), which can achieve precise position and orientation estimation using only a monocular camera and a single quick response (QR) code beacon. In the considered system, a few QR codes are placed on the ceiling, and a user holds a camera in hand to capture one QR code for positioning. In particular, we first propose an efficient matching mechanism to match the feature points of the captured QR beacon to their projections in the image plane of the camera. Then, based on the geometry relations between the feature points and their projections, V-FTQ is able to calculate the coordinates of the feature points in the camera coordinate. Next, the pose and position of the user are estimated based on linear algebra and spatial geometry. Finally, a singular solution elimination scheme is further proposed to effectively eliminate incorrect solutions estimated by V-FTQ, remaining correct pose and position. The simulation results demonstrate that V-FTQ outperforms similar algorithms in terms of precision and robustness to noise. © 2023 IEEE.

关键词： beacon camera Visual positioning

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Demonstration of Time Redundancy Mechanism for Deterministic Communications over Hybrid networks

Demonstration of Time Redundancy Mechanism for Deterministic...

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OptoElectronics and Communications Conference, OECC

作者： Hongxing Li Guochu Shou State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

We propose a time redundancy mechanism to enhance the determinism of 5G TSN hybrid networks, and experimentally demonstrate the most cost-effective enhancement occurs when frame is replicated four times with 42% maxim... 详细信息

ISBN: (数字)9798350308396

ISBN: (纸本)9798350308402

关键词： 5G mobile communication Redundancy Jitter

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