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IEEE Wireless Communications and networking Conference (IEEE WCNC)

作者： Wang, Xudong Feng, Lei Zhou, Fanqin Li, Wenjing Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China

ISBN: (纸本)9798350303582;9798350303599

The intelligent reflecting surface (IRS) serves to manipulate information and modulate signals, facilitating space-time coding in wireless communication. This study presents an innovative model for implementing space-time block coding (STBC), where the base station transmits multiple symbols to a user using multiple IRSs. These IRSs manipulate phase shifts to establish robust links. Initially, statistical characterizations are derived for the sum of independent generalized gamma (GG) random variables, providing expressions for the end-to-end signal-to-noise ratio (SNR). Subsequently, a closed-form expression for symbol error rate (SER) is developed to evaluate reliability performance. Additionally, an asymptotic expression for SER at high transmission power is supplied to outline performance limits. Simulation results reveal that the STBC system assisted by multiple IRSs attains comparable or superior performance when contrasted with the STBC system that employs multiple amplify-and-forward (AF) relays, utilizing a restricted number of reflecting units.

关键词： Intelligent reflecting surface space-time block coding phase shift relay

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Hybrid CRB Analysis for Location Sensing in UAV mmWave Systems Under Jittering Effects 16

Hybrid CRB Analysis for Location Sensing in UAV mmWave Syste...

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16th International Conference on Wireless Communications and Signal Processing, WCSP 2024

作者： Chen, Wenyun Liu, Chenxi Peng, Mugen Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350390643

Unmanned aerial vehicle (UAV) systems are vulnerable to the inevitable UAV jitter, the impacts of which on both communications and sensing become more detrimental in the high frequency millimeter wave (mmWave) band. While the UAV jittering effects on communications have been intensively investigated, those on sensing have so far drawn little attention. In this paper, we investigate the location sensing performance of the UAV mmWave system in the presence of jitter. To this end, we identify that the location sensing performance under jittering effects is determined not only the deterministic target's location, but also random instantaneous attitude angles of the UAV. Based on this identification, we derive the closed-form expression of the hybrid Cramer-Rao bound (HCRB) and its approximation to characterize the location sensing performance of our considered system, revealing how the UAV jitter introduces extra location sensing error. Through numerical results, we validate our HCRB analysis. Moreover, we show that the detrimental effects of UAV jitter can be well alleviated by increasing the number of measurements. © 2024 IEEE.

关键词： Cramer-Rao bounds

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Gaussian Decoupling Based Stochastic Resonance for Weak Optical Signal Detection 24

Gaussian Decoupling Based Stochastic Resonance for Weak Opti...

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24th IEEE International Conference on Communication technology, ICCT 2024

作者： Chen, Zhibei Yuan, Renzhi Wang, Siming Chu, Xinyi Di, Shijie Li, Junwei Li, Yuchai Sun, Kailin Guo, Jia Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350363760

Weak signal detection methods can improve the SNR by recognizing the effective signals submerged in background noise. However, the existing stochastic resonance (SR) method is confined exclusively to the optimization of potential function parameters. Actually, the bit-error rate (BER) can be optimized by eliminating the correlation among SR output points. In this work, we propose a Gaussian decoupling based SR method to improve the detection performance of weak optical signals. We first perform the SR method on the received weak optical signal and approximate the probability distribution of the SR output points as a multi-dimensional Gaussian distribution. Then we apply a linear transformation based on eigenvalue decomposition of the Gaussian covariance matrix to decouple the correlation among SR output points. Numerical results show that the BER of Gaussian decoupling based SR method can be one order of magnitude lower than that of the ordinary SR method even when the SNR of input signal is -8 dB. © 2024 IEEE.

关键词： Eigenvalues and eigenfunctions

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Access Optimization in 802.11ax WLAN for Load Balancing and Competition Avoidance of IPTV Traffic

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IEEE TRANSACTIONS ON BROADCASTING 2024年第2期70卷 401-412页

作者： Shao, Sujie Zhang, Linlin Qi, Fei Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China China Telecom Res Inst Beijing 102209 Peoples R China

With the improvement of terminal intelligence and the enrichment of digital content, terminal density is showing an explosive growth trend, and the traffic carried by IPTV and other services is rapidly increasing. HDHB WLAN (High-Density High-Bandwidth Wireless LAN) is becoming a dominant form of wireless LAN. However, the RSSI-based access mode has led to a notable load imbalance, and the resource competition mode based on random access intensifies the difficulty of access resource acquisition, which exacerbates the traffic challenges faced by WLAN. IEEE 802.11ax somewhat alleviates traffic pressure, but it does not fundamentally solve these problems. This paper introduces an access optimization mechanism for the 802.11ax HDHB WLAN, which aims to achieve load balancing while considering competition avoidance, alleviating the pressure of IPTV traffic. First, an 802.11ax access optimization architecture for HDHB WLAN is constructed, aimed at alleviating traffic pressure and meeting the quality requirements of IPTV and other services by modifying access processes of terminals. Next, a terminal information acquisition and interactive access control strategy based on the trigger frame is devised to obtain accurate parameter information and facilitate orderly concurrent access control for high-density terminals. Additionally, a load balancing and competition avoidance oriented access control method for HDHB WLAN is proposed, including an access optimization control model, and an access strategy generation algorithm based on the Improved DQN algorithm. Finally, simulation results show that the global throughput and load balancing of HDHB WLAN are improved, consequently reducing overall WLAN traffic pressure.

关键词： WLAN access 802.11ax load balancing competition avoidance

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A Shared Cluster-Based Stochastic Channel Model for Integrated Sensing and Communication Systems

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IEEE TRANSACTIONS ON VEHICULAR technology 2024年第5期73卷 6032-6044页

作者： Liu, Yameng Zhang, Jianhua Zhang, Yuxiang Yuan, Zhiqiang Liu, Guangyi Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China China Mobile Res Inst Beijing 100053 Peoples R China

Integrated Sensing And Communication (ISAC) has been recognized as a promising technology in the 6G communication. A realistic channel model is a prerequisite for designing ISAC systems. Most existing channel models independently generate the communication and sensing channels under the same framework. However, due to the multiplexing of hardware resources and the same environment, signals enabled for communication and sensing may experience shared propagation scatterers. This practical sharing feature necessities the joint generation of communication and sensing channels for realistic modeling, where the shared clusters (contributed by the shared scatterers) should be reconstructed. In this paper, we first conduct communication and sensing channel measurements for an indoor scenario at 28 GHz. The power-angular-delay profiles of multipath components are obtained, and the shared scatterers by communication and sensing channels are intuitively observed. Then, a stochastic ISAC channel model is proposed to capture the sharing feature, where shared and non-shared clusters by the two channels are defined and superimposed. To extract those clusters from measured ISAC channels, a KPowerMeans-based joint clustering algorithm is novelly introduced. Finally, stochastic channel characteristics are analyzed, and empirical simulations validate that the channel Sharing Degree (SD) increases with more shared clusters. The proposed model can realistically capture the sharing feature of ISAC channels and is able to evaluate and simulate the channel SD values, which is valuable for the design and deployment of ISAC systems.

关键词： Sensors Antenna measurements Horn antennas Channel models Rotation measurement Position measurement Delays Integrated sensing and communication (ISAC) channel measurements and modeling shared cluster joint clustering sharing degree (SD)

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BGP prefix hijack detection algorithm based on MOAS event feature

BGP prefix hijack detection algorithm based on MOAS event fe...

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2024 International Conference on Computer Network Security and Software Engineering, CNSSE 2024

作者： Chen, Kaiyu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781510680234

Border Gateway Protocol (BGP) is the Internet standard inter-domain routing protocol, has become an important infrastructure of the Internet. Due to the limitation of the initial design, BGP prefix hijacking is a kind of BGP security problem that needs to be solved urgently. This paper proposes a BGP prefix hijack detection algorithm based on Multiple Origin AS (MOAS) event feature, discovering and restoring MOAS events from BGP packets, and creating an event matrix for MOAS events based on the changes of source AS observed from different observation points over time. According to the MOAS event matrix, the eigenvalue of the event is calculated from the perspective of the overall probability of the event and the local visibility of the observation point. Finally, the characteristic value of the MOAS event is compared with the exception event threshold to determine whether the event is an exception event, and then the BGP prefix hijacking is found. Compared with the prefix hijacking detection algorithm based on source AS validity, the detection results of this algorithm have higher accuracy. This method is more practical in detecting prefix hijacking according to the characteristics of the event itself. © 2024 SPIE.

关键词： Anomaly detection

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Device-Cloud Collaborative DDoS Resistance for QoS-Sensitive Mobile Applications: A Seamlessly Shuffle-based Moving Target Defense Approach

Device-Cloud Collaborative DDoS Resistance for QoS-Sensitive...

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2024 IEEE Global Communications Conference, GLOBECOM 2024

作者： Yan, Lin Zhou, Zan Yang, Shujie Xu, Changqiao Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350351255

DDoS attacks pose a fundamental security consideration for any application. With the rapid development of technology, highly QoS-sensitive and rich interaction mobile applications have occupied a great portion of current network traffic. However, owing to their inherent compatibility defects, current shuffle-based solutions fail to accommodate the urgent needs of QoS-sensitive applications, as the defenders require either nonnegligible service interruption or obligatory system modification. Therefore, we propose a feasible DDoS defense solution called RINP, which can be seamlessly integrated with existing applications through its innovative overlay-based wrap mechanism and isolated sidecar implementation. What's more, we mathematically analyse the communication efficiency and false positive rate of RINP, which provides theoretical foundation for further adaptive defense strategy generation. Last but not least, to demonstrate the superiority of the RINP demo, we conduct a series of experiments in real-world WAN scenarios. The experimental results with Iperf3 (both TCP/UDP modes) show that our compatible defense solution can jointly provide great service continuity and maintain high-quality QoS. To the best of our knowledge, this is the first user-imperceptible and nonintrusive device-cloud collaborative defense solution for QoS-sensitive mobile applications. The source code can be found at https://***/bupt-narc/rinp. © 2024 IEEE.

关键词： HTTP

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Impacts of Blockages on UAV-Enabled Integrated Sensing and Communications 16

Impacts of Blockages on UAV-Enabled Integrated Sensing and C...

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16th International Conference on Wireless Communications and Signal Processing, WCSP 2024

作者： Liu, Chengguang Liu, Chenxi Chen, Wenyun Peng, Mugen Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing100876 China

ISBN: (纸本)9798350390643

In this paper, we investigate the impacts of block-ages on the performances of the unmanned aerial vehicle (UAV)-enabled integrated sensing and communication (ISAC) systems. Specifically, we first derive the distance distribution between UAV and a typical target in both communication and sensing scenarios, in the presence of three-dimensional blockages. Compared to previous models that either ignored blockage effects or considered only in two-dimensional plane, our model provides a more realistic characterization of random blockages in UAV-enabled ISAC systems. Then, we leverage the tools from stochastic geometry to derive the analytical expressions of the communication coverage probability and successful detection probability in our considered system. Finally, we validate our analysis through numerical results and reveal the interactions between communication and sensing performances, under the impacts of blockages. © 2024 IEEE.

关键词： Stochastic systems

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Intellicise communication system: model-driven semantic communications

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The Journal of China Universities of Posts and Telecommunications 2022年第1期29卷 2-12页

作者： Zhang Ping Xu Xiaodong Dong Chen Han Shujun Wang Bizhu State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

As one of the critical technologies for the 6 th generation mobile communication system(6 G) mobile communication systems, artificial intelligence(AI) technology will provide complete automation for connecting the virtual and physical worlds. In order to construct the future ubiquitous intelligent network, people are beginning to rethink how mobile communication systems transmit and exploit intelligent information. This paper proposes a new communication paradigm, called the Intellicise communication system: model-driven semantic communication. Intellicise communication system is built on top of the traditional communication system and innovatively adds a new feature dimension on top of the traditional source coding, which enables the communication system to evolve from the traditional transmission of bit to the transmission of "model". Like the semantic base(Seb) for semantic communication, the model is considered as the new feature obtained from the joint source-channel coding. The sink node can re-construct the original signal based on the received model and the encoded sequence. In addition, the performance evaluation metrics and the implementation details of the Intellicise communication system are discussed in this paper. Finally, preliminary results of model-driven image transmission in the Intellicise communication system are presented.

关键词： Intellicise communication system semantic communications model driven the 6th generation mobile communication system artificial intelligence

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Queuing Analysis of Energy Harvesting-Aided NOMA-MEC Network

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IEEE TRANSACTIONS ON VEHICULAR technology 2024年第9期73卷 14068-14073页

作者： Meng, Yue Zhang, Zhi Huang, Yuzhen Zhang, Ping Beijing Univ Posts & Telecommun State Key Lab Networking & Switching Technol Beijing 100876 Peoples R China Acad Mil Sci PLA Beijing 100097 Peoples R China

Non-orthogonal multiple access (NOMA) and energy harvesting (EH) have emerged as promising technologies to improve the energy efficiency and capacity of mobile edge computing (MEC) network. In this network, the mobile users utilize harvested energy to support the tasks computed locally or offloaded to MEC server through NOMA transmission. We propose an analytical framework to comprehensively explore the performance of the task processing procedure under EH-aided NOMA-MEC network. Specifically, taking into account the EH constraint, local computing capacity, and NOMA offloading constraint, a four-dimensional Markov chain is introduced to model the task processing in each mobile user. To obtain the steady state of this Markov chain, we employ queuing theory to construct a discrete-time Geo/G/1 queue. By deriving the successful computation probability and the successful offloading probability, the mean response time for task completion is derived, which is a critical performance metric for the network. Numerical simulations are provided to verify the accuracy and facilitate the performance of the proposed framework.

关键词： Task analysis NOMA Servers Energy consumption Computational modeling Signal to noise ratio Resource management MEC EH queuing analysis

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