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International Conference on Wireless Communications and Signal Processing (WCSP)

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

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.

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Task-Oriented Semantic Communication Based on Semantic Triplets

Task-Oriented Semantic Communication Based on Semantic Tripl...

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IEEE Conference on Wireless Communications and networking

作者： Chuanhong Liu Caili Guo Siyi Wang Yuze Li Dingxin Hu Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China School of Artificial Intelligence Beijing University of Posts and Telecommunications Beijing China

Task-oriented semantic communication has received growing interests, which can significantly reduce the amount of transmitted data without affecting task performance. In this paper, a novel semantic communication system based on semantic triplets (SCST) is proposed, in which the semantics is represented via the explainable semantic triplets. Specifically, we propose a semantic extraction method to convert the transmitted texts into semantic triplets, which can be further compressed via the designed semantic filtering method. The semantic triplets then will be encoded and transmitted via the wireless channel to complete intelligent tasks at the receiver. Moreover, we then apply the SCST to sentiment analysis task and question-answering task to verify the effectiveness, where the semantic encoder and decoder are designed respectively considering the final task. The experiment results show that the proposed SCST can obtain at least 43.5% and 52% accuracy gains, compared to the baselines using traditional communication method.

关键词： Wireless communication Fading channels Sentiment analysis Filtering Simulation Semantics Receivers

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Cluster-Based Interference-Free MAC Protocol with Load Aware in Software Defined VANET

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China Communications 2020年第12期17卷 217-234页

作者： Yangshui Gao Tao Luo Xinxin He Zhilong Zhang Beijing Laboratory of Advanced Information Networks Beijing University of Posts and TelecommunicationsBeijing 100876China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and TelecommunicationsBeijing 100876China School of Mathematics and Computer Dali UniversityDali 671003China

In order to reduce the interference,a novel,cluster-based medium access control(MAC)protocol with load aware for VANETs is proposed in this ***,all vehicles on roads are grouped into stable clusters in the light of their direction,number of neighbors,link reliability,and traffic *** utilizing the advantages of centralized control in software defined VANETs(SDVN),cluster stability can be maintained in ***,a contention-free MAC mechanism composed of inter-cluster multi-channel allocation and intra-cluster dynamic TDMA frame allocation is proposed to prevent co-channel interference and hidden terminal *** results show that the proposed protocol outperforms some existing protocols in cluster stability,delivery ratio,throughput and delay performance.

关键词： SDVN MAC co-channel interference non-safety services cluster

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Two-Stream Convolutional Neural network for Skeleton-Based Action Recognition 6

Two-Stream Convolutional Neural Network for Skeleton-Based A...

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6th IEEE International Conference on Computer and Communications, ICCC 2020

作者： Shi, Yao Wu, Muqing Xu, Weiyao Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9781728186351

ISBN: (纸本)9781728186351

Skeleton-based action recognition has attracted much attention while the skeleton contains important information related to action. How to efficiently use the temporal and spatial information in skeleton data is still an open problem. We propose in this paper a two-stream convolutional neural network which combines joints information with bone information to recognize actions. More specifically, the input of one stream is the joints position information (point information) and the other is the bone vector information (direction and length information) which is more informative in local relative change. Every stream also integrates motion information which represent temporal difference of inputs. Besides, we enhance our network using asymmetric convolution blocks (ACBlock). ACBlock can capture features efficiently and reduce the negative effects of rotation and deformation which contributes to feature extraction. Experiments on NTU-RGB+D datasets demonstrate the advantage of the proposed model on effectiveness of the novel model to recognize the action. © 2020 IEEE.

关键词： Convolution

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Lightweight Task-Oriented Semantic Communication Empowered by Large-Scale AI Models

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IEEE Transactions on Vehicular Technology 2025年

作者： Liu, Chuanhong Guo, Caili Yang, Yang Chen, Mingzhe Quek, Tony Q. S. 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 University of Miami Department of Electrical and Computer Engineering Institute for Data Science and Computing Coral GablesFL United States Singapore University of Technology and Design Dept. of Information Systems Technology and Design 487372 Singapore

Recent studies have focused on leveraging large-scale artificial intelligence (LAI) models to improve semantic representation and compression capabilities. However, the substantial computational demands of LAI models pose significant challenges for real-time communication scenarios. To address this, this paper proposes utilizing knowledge distillation (KD) techniques to extract and condense knowledge from LAI models, effectively reducing model complexity and computation latency. Nevertheless, the inherent complexity of LAI models leads to prolonged inference times during distillation, while their lack of channel awareness compromises the distillation performance. These limitations make standard KD methods unsuitable for task-oriented semantic communication scenarios. To address these issues, we propose a fast distillation method featuring a pre-stored compression mechanism that eliminates the need for repetitive inference, significantly improving efficiency. Furthermore, a channel adaptive module is incorporated to dynamically adjust the transmitted semantic information based on varying channel conditions, enhancing communication reliability and adaptability. In addition, an information bottleneck-based loss function is derived to guide the fast distillation process. Simulation results verify that the proposed scheme outperform baselines in term of task accuracy, model size, computation latency, and training data requirements. © 1967-2012 IEEE.

关键词： NP-hard

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An Effective Routing Mechanism Based on Fuzzy Logic for Software-Defined Data Center networks 6

An Effective Routing Mechanism Based on Fuzzy Logic for Soft...

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6th IEEE International Conference on Computer and Communications, ICCC 2020

作者： Xu, Yang Muqing, Wu Guohao, Yao Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781728186351

In order to solve the problem of low throughput and poor performance in data center network, this paper proposes a traffic scheduling algorithm exploiting fuzzy logic inference based on Software Defined networking (SDN). The algorithm uses the characteristics of separation of control and forwarding in SDN architecture to choose paths for data flows by the centralized control of controller. It calculates the candidate path set of accessible paths between the source host and the destination host, then comprehensively considers path hops and bandwidth utilization, evaluates the candidate path using fuzzy logic model, and selects the optimal path. The experimental results show that compared with ECMP, Hedera and FSEM, the proposed algorithm improves the network throughput and load balancing, thus improving the overall network performance of the data center. © 2020 IEEE.

关键词： Fuzzy logic

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Conformal Distributed Remote Inference in Sensor networks Under Reliability and Communication Constraints

arXiv

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arXiv 2024年

作者： Zhu, Meiyi Zecchin, Matteo Park, Sangwoo Guo, Caili Feng, Chunyan Popovski, Petar Simeone, Osvaldo Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China Department of Engineering King’s College London LondonWC2R 2LS United Kingdom Connectivity Section Aalborg University Aalborg Denmark

This paper presents communication-constrained distributed conformal risk control (CD-CRC) framework, a novel decision-making framework for sensor networks under communication constraints. Targeting multi-label classification problems, such as segmentation, CD-CRC dynamically adjusts local and global thresholds used to identify significant labels with the goal of ensuring a target false negative rate (FNR), while adhering to communication capacity limits. CD-CRC builds on online exponentiated gradient descent to estimate the relative quality of the observations of different sensors, and on online conformal risk control (CRC) as a mechanism to control local and global thresholds. CD-CRC is proved to offer deterministic worst-case performance guarantees in terms of FNR and communication overhead, while the regret performance in terms of false positive rate (FPR) is characterized as a function of the key hyperparameters. Simulation results highlight the effectiveness of CD-CRC, particularly in communication resource-constrained environments, making it a valuable tool for enhancing the performance and reliability of distributed sensor networks. Copyright © 2024, The Authors. All rights reserved.

关键词： Risk assessment

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Research on key Node Evaluation Algorithm of Multi-index Based on Betweenness Centrality-Structure Holes

Research on Key Node Evaluation Algorithm of Multi-index Bas...

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Science and Technology Innovation (IAECST), International Academic Exchange Conference on

作者： Xin Di Muqing Wu Min Zhao Beijing Key Laboratory of Network System Architecture and Convergence Acknowledgment Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781665402682

The power optical network has the characteristics of complex structure and diversified power business. The safe operation of the power grid puts forward higher requirements for the survivability of the power optical network. In order to more accurately identify the key nodes in the optical network. This paper comprehensively considers the impact of the global importance and local importance of nodes on network performance. Based on the betweenness centrality, paper considers the structural hole index that shows local characteristic attributes of nodes. Based on betweenness centrality -structure holes, the paper innovatively proposed a multi-index key node evaluation algorithm. This algorithm uses the entropy method to quantify the amount of data information of betweenness centrality and structural hole indicators, which assigns weights to them according to the degree of index differentiation. On the basis of this, algorithm taking into account the impact of business importance, obtains a comprehensive evaluation index for node importance identification. In the simulation process, paper compares with other algorithms to analyze the impact of the network topology layer to the power grid after the node fails. It analyzes the vulnerability of the network by using the global network efficiency and the maximum sub-graph connectivity rate, and integrate the business importance to analyze the impact of the network topology and the business multi-layer to the power grid after the node fails. Paper use CVE (Cross Layer Vulnerability Entropy) to describe the comprehensive loss of the network. Then paper uses the distinguishability of the node importance value as an index to quantify the degree of granularization of the node sorting results. Finally, the accuracy of the algorithm is verified according to the changes in the vulnerability of the network and the comprehensive loss.

关键词： Optical losses Technological innovation Cross layer design network topology Optical fiber networks Power grids Entropy

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Design of Tri-band Unidirectional Printed Antenna 4

Design of Tri-band Unidirectional Printed Antenna

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4th IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2021

作者： Zha, Wende Feng, Botao Chung, Kwok L. Deng, Li College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China School of Computer Science and Engineering Huizhou University Huizhou516007 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781665432030

In this paper, a tri-band unidirectional printed antenna is presented. By employing a torch-shaped structure to cooperate with a pair of side-by-side rectangular patches, triple band characteristics are realized. Simulation results show that the working frequency bands are 806-960 MHz, 1.71-2.7 GHz and 3.3-3.7 GHz, respectively, which cover the LTE700/ GSM850/ GSM900, S-band and WLAN frequency bands. A compact and simple structure with good radiation characteristics is achieved by the proposed antenna, which is suitable for multi-frequency wireless communications. ©2021 IEEE

关键词： Microstrip antennas

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A wide-beamwidth differentially-fed filter antenna for ultra-wideband applications 4

A wide-beamwidth differentially-fed filter antenna for ultra...

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4th IEEE International Conference on Electronic Information and Communication Technology, ICEICT 2021

作者： Qi, Siyuan Feng, Botao Deng, Li College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781665432030

A wide-beamwidth differentially-fed filter antenna for ultra-wideband (UWB) communications is presented. The proposed antenna includes two parts: a radiating structure in the upper substrate and a differential feeding structure in the lower one. The antenna profile is 0.06λ0 (where λ0 is the initial wavelength). Simulation results verify that the antenna has a bandwidth of 6.36-8.57 GHz and its gain is 5.1 ±1.2 dBi. ©2021 IEEE

关键词： Ultra-wideband (UWB)

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