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Analysis and Optimization on Partition-Based Caching and Delivery in Satellite-Terrestrial Edge Computing networks

China communications 2023年第3期20卷 252-285页

作者： Peng Wang Xing Zhang Jiaxin Zhang Shuang Zheng Wenhao Liu Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless CommunicationMinistry of EducationSchool of Information and Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China

As a viable component of 6G wireless communication architecture,satellite-terrestrial networks support efficient file delivery by leveraging the innate broadcast ability of satellite and the enhanced powerful file transmission approaches of multi-tier terrestrial *** the paper,we introduce edge computing technology into the satellite-terrestrial network and propose a partition-based cache and delivery strategy to make full use of the integrated resources and reducing the backhaul *** on the interference effect from varied nodes in different geographical distances,we derive the file successful transmission probability of the typical user and by utilizing the tool of stochastic *** the constraint of nodes cache space and file sets parameters,we propose a near-optimal partition-based cache and delivery strategy by optimizing the asymptotic successful transmission probability of the typical *** complex nonlinear programming problem is settled by jointly utilizing standard particle-based swarm optimization(PSO)method and greedy based multiple knapsack choice problem(MKCP)optimization *** results show that compared with the terrestrial only cache strategy,Ground Popular Strategy,Satellite Popular Strategy,and Independent and identically distributed popularity strategy,the performance of the proposed scheme improve by 30.5%,9.3%,12.5%and 13.7%.

关键词： edge computing satellite terrestrial net-works caching deployment stochastic geometry 6G networks

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An Enhanced Resilience and Throughput BBV-based Method for UAV networks 24

An Enhanced Resilience and Throughput BBV-based Method for U...

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24th IEEE International Conference on communication Technology, ICCT 2024

作者： Sun, Jinghong Chu, Yueyan Shi, Ce Guo, Wenbin Beijing University of Posts and Telecommunications Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communications Ministry of Education Beijing China

ISBN: (纸本)9798350363760

In harsh environments such as battlefield operations and emergency communications, communication rate and network resilience significantly impact the performance of UAV swarm networks. This paper proposes a scalable UAV network construction scheme named UMBTO, which aims to maximize communication rates while enhancing network resilience. By considering the communication range of UAVs and introducing triangular linking methods to improve the Barrat, Barthelemy, and Vespignani (BBV) model, suitable links are established for each new UAV, endowing the network with stronger resilience against random failures. Furthermore, considering the existing links and relative positions between UAVs, we formulate a system-wide link communication rate (SLCR) maximization problem. By dynamically adjusting the deployment positions of UAVs to maximize SLCR, the scheme ensures effective information exchange within the swarm, enhancing collaborative efficiency. The constructed network is scalable, allowing new UAVs to be seamlessly integrated without the need for cumbersome steps to rebuild the network topology. Evaluation and simulation results demonstrate that the proposed scheme constructs UAV networks with stronger resilience and better link communication rates compared to traditional BBV networks. © 2024 IEEE.

关键词： Information dissemination

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Data Transmission Based on RNN Compensation over Mobile Voice Channel

Data Transmission Based on RNN Compensation over Mobile Voic...

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2023 IEEE/CIC International Conference on communications in China, ICCC 2023

作者： Gao, Xiang Peng, Tao Beijing University of Posts & Telecommunications Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communications Ministry of Education Beijing China

ISBN: (纸本)9798350345384

Data transmission over mobile voice channel (DoV) suffers from vocoder compression and smartphone de-noising. Most previous algorithms ignore these two factors leading to the generated signal being distorted severely during real network transmission. This paper proposes a data modulation algorithm that maps data on the amplitude of different frequency components, and combined with interpolation 0 in frequency domain to obtain short-time stability. Then, a recurrent neural network (RNN) based compensation algorithm is proposed to compensate for distorted signal. As a result, this paper achieves 3.1kb/s data rate with an average 4.5% bit error rate (BER) in real network experiments. Numerical results suggest that the proposed algorithm has a considerable advantage in resisting smartphone de-noising and is capable of reducing distortion generated during transmission. © 2023 IEEE.

关键词： Smartphones

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Random Access Preamble Sequence Design in High-Speed Scenario 17th

Random Access Preamble Sequence Design in High-Speed Scenari...

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17th International Conference on communications and networking, ChinaCom 2022

作者： Qiu, Ziyuan Wang, Sen Wang, Qixing He, Wenxi Long, Hang Wireless Signal Processing and Network Lab Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing China China Mobile Research Institute Beijing China Purple Mountain Laboratories Nanjing China

ISBN: (纸本)9783031347894

Random access preamble sequences are sent from the user equipment (UE) to gNodeB though Physical Random Access Channel to access to the network. In high-speed scenarios, the performance of random access based on Zadoff-Chu sequences degrades due to the Doppler frequency offset which breaks the sub-carrier orthogonality. In this paper, a random access preamble sequence with linear change in phase is proposed based on the analysis of the influence of frequency offset on the correlation results of random access preamble sequence. The method of decreasing the peak-to-average power ratio of time domain sequence and the random access preamble sequence design compatible with orthogonal time-frequency space technology are proposed. The false detection rate and the timing error distribution are evaluated. The simulation results show that the proposed designs of random access preamble sequence are insensitive to frequency offset, and the detection performance and timing performance are almost unaffected by frequency offset. © 2023, ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering.

关键词： Peak to average power ratio

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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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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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Inter-carrier Interference Analysis and Mitigation for OFDM System over Fast Fading Channels

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Chinese Journal of Electronics 2023年第1期19卷 181-186页

作者： Yuexing Peng Hui Zhao Wenbo Wang Key Lab of Universal Wireless Communications Ministry of Education Wireless Signal Processing and Network Lab School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

Inter-carrier interference (ICI) due to Doppler spread is analyzed for OFDM system in highly mobile applications, and then an iterative ICI mitigation method is developed. With the Jakes' model for the Doppler power spectrum and linear model in one OFDM symbol interval for time-varying channel, the analytical closed-form expression of signal-to-interference ratio (SIR) and signal-to-interference-plus-noise ratio (SINR) are developed with neither assumption on the statistical characteristic of ICI nor constraint on the statistical model for the fading channels. Then, a joint detection algorithm is proposed to iteratively mitigate ICI and estimate channel and detect symbols, where the ICI from a few neighboring interfering subcarriers which contribute the majority of ICI power is regenerates and partially subtracted from the received signal in order to mitigate decision error accumulation. The number of concerned interfering subcarriers and the optimal partial ICI cancellation factor are investigated for the tradeoff of complexity reduction and Mean square error (MSE) minimization. Simulation results verify the proposed method can mitigate ICI effectively.

关键词： Fading channels Analytical models OFDM Simulation Symbols Time-varying channels Mobile applications

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Energy-Efficient UAV-Based IoT communications With WiFi Suppression in 5 GHz ISM Bands

Energy-Efficient UAV-Based IoT Communications With WiFi Supp...

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作者： Lin, Deping Zuo, Peiliang Peng, Tao Qian, Rongrong Wang, Wenbo Beijing University of Posts and Telecommunications Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communication Ministry of Education Beijing100876 China Beijing Institute of Electronic Science and Technology Department of Electronics and Communication Engineering Beijing100070 China Beijing University of Posts and Telecommunications School of Artificial Intelligence Beijing100876 China

Unmanned Aerial Vehicle (UAV) based communication is a promising technology for offering wireless communication services. UAVs can typically be adopted as aerial base stations to collect data from ground Internet of Things (IoT) devices. However, the Ground-to-Air link of UAV-based IoT communications is prone to be interfered by surrounding WiFi devices in the Industrial, Scientific, Medical (ISM) band. This paper aims to enable reliable uplink communications for IoT devices in 5 GHz ISM bands, thereby reducing the hover time and energy consumption of the UAV. To this end, we first study and design suppression frames suitable for WiFi devices. Then a suppression method is proposed, which is shown to be effective for all the tested devices, based on emulation performance verification of the frames for multiple commercial off-the-shelf (COTS) WiFi devices. Moreover, by taking the energy consumption of the UAV and multiple transmission parameters of the suppression method into account, we formulate an optimization problem for the desired uplink, which is designed to minimize the energy consumption of the UAV, under the constraints of satisfying the link channel capacity. Given that the optimization problem is non-convex mixed-integer nonlinear programming, this paper proposes an efficient algorithm that takes advantage of the suppression performance of the utilized frames. Numerical simulations demonstrate the performance of the proposed algorithm in terms of the WiFi device density, UAV weight, channel capacity requirement and parameters of the suppression method. The communication quality of the desired Ground-to-Air link is shown to be significantly improved, while the consumed energy is demonstrated to be obviously reduced. © 1967-2012 IEEE.

关键词： Internet of things

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Precoding Schemes for wireless Beam Modulation System

Precoding Schemes for Wireless Beam Modulation System

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IEEE Conference on Vehicular Technology (VTC)

作者： Xiao Chen Congxi Liu Xinyan Yu Hang Long Wireless Signal Processing and Network Lab. Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350387414

ISBN: (纸本)9798350387421

Millimeter wave communication systems offer a new perspective for addressing bandwidth congestion, but their high hardware cost and power consumption limit their application in Internet of Things (IoT) devices. A wireless beam modulation (WBM) system has been proposed as a cost-effective alternative. The patch antenna array on the IoT nodes formulates two transmit beams with different directions. Information bits are transmitted through the energy difference of aligned beams by WBM. However, challenges arise from the random emission of beams and the avoidance of complex data processing, resulting in signal attenuation and reduced communication quality. In this paper, the optimal precoding scheme is first derived, and then we design a manifold optimization-based precoding scheme that directly handles the constant modulus constraint of the precoding vectors. Simulation results show that the proposed precoding scheme achieves a significant performance improvement over existing ones and performs close to the theoretical upper bound when the gains of the different paths in the channel are fairly consistent.

关键词： wireless communication Vehicular and wireless technologies Upper bound Precoding Simulation Transmitting antennas Modulation

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Joint DFBS Beamforming and HRIS Beamforming for HRIS-Aided ISAC Systems

Joint DFBS Beamforming and HRIS Beamforming for HRIS-Aided I...

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IEEE International Conference on communications in China (ICCC)

作者： Wenkang He Chunjing Hu Yongqing Xu Yong Li Wireless Signal Processing and Network Laboratory Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350378412

ISBN: (纸本)9798350378429

The hybrid reconfigurable intelligent surface (HRIS) is capable of simultaneous programmable reflections and sensing. It has been applied in the fields of either communication or target localization, but its potential in integrated sensing and communication (ISAC) systems has yet to be fully discussed. In this paper, we consider an HRIS-aided ISAC system, where a dual-function base station (DFBS) simultaneously transmits communication and radar signals with the aid of an HRIS, and the HRIS not only facilitates the transmission of communication signals to users but also receives radar signals reflected by the target. Under such a scenario, an optimization problem is formulated to maximize the sensing signal-to-interference-plus-noise ratio (SINR) while satisfying the communication SINR requirements, the transmit power budget of the DFBS and the unit modulus property of the reflection and reception coefficients. Subsequently, we propose an efficient iterative algorithm based on the Rayleigh quotient, the Dinkelbach’s transform, and the successive convex approximation (SCA) methods to solve the formulated problem. Simulation results illustrate that the HRIS with equal amplitude factors and just optimizing its phase shifts can also improve the sensing SINR while guaranteeing the communication SINR requirements.

关键词： Array signal processing Simulation Human-robot interaction Interference Transforms Radar Reconfigurable intelligent surfaces

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