本期目录

2023年 30卷 6期 刊出日期：2023-12-28



Multi-agent System Cooperative Control

Dynamic event-triggered leader-follower consensus of nonlinear multi-agent systems under directed weighted topology

吴岳, 陈向勇, 邱建龙, 胡顺伟, 赵峰

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1019

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This paper studies the dynamic event-triggered leader-follower consensus of nonlinear multi-agent systems (MASs) under directed weighted graph containing a directed spanning tree, and also considers the effects of disturbances and leader of non-zero control inputs in the system. Firstly, a novel distributed control protocol is designed for uncertain disturbances and leader of non-zero control inputs in MASs. Secondly, a novel dynamic event-triggered control ( DETC) strategy is proposed, which eliminates the need for continuous communication between agents and reduces communication resources between agents. By introducing dynamic thresholds, the complexity of excluding Zeno behavior within the system is reduced. Finally, the effectiveness of the proposed theory is validated through numerical simulation.

Distributed consensus of Lurie multi-agent systems under directed topology: a contraction approach

张晓娇, 吴祥

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1018

摘要 ( 748 ) PDF (3622 KB)( 155 )

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This paper is devoted to investigate the consensus problems for the multi-agent systems with Lurie nonlinear dynamics in directed topology. Under some assumptions, some sufficient conditions for the systems reaching leaderless consensus and tracking consensus are established by using contraction analysis theory. Compared with the existing results, there is no need to formulate the multi-agent networks in compact form. These conditions are only related to the individual agent in lower-dimensional case and the communication topology of the network. Additionally, a generalized nonlinear function is introduced. Finally, three numerical examples are demonstrated to illustrate the effectiveness of the theoretical results.

Complex Network Identification and Control

Parameter optimization of complex network based on the change-point identification

许杏桃, 陶加贵

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1014

摘要 ( 720 ) PDF (6155 KB)( 106 )

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This paper proposes a novel method for the parameter optimization of complex networks established through coarsening and phase space reconstruction. Firstly, we identify the change-points of the time series based on the cumulative sum ( CUSUM) control chart method. Then, we optimize the coarse-graining parameters and phase space embedding dimension based on the evolution analysis of the global topology index ( betweenness) at the mutation point. Finally, we conduct a simulation analysis based on real-time data of Chinese copper spot prices. The results show that the delay of the copper spot prices in Chinese spot market is 1 day, and the optimal embedding dimension of the phase space reconstruction is 3. The acceptance level of the investors towards the small fluctuations in copper spot prices is 0.2 times than the average level of price fluctuations, which means that an average price fluctuation of 0.2 times is the optimal coarse-graining parameter.

Stability and Hopf bifurcation analysis in DCTCP congestion control

程尊水, 姜景娜, 孙东晟

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1015

摘要 ( 856 ) PDF (3657 KB)( 100 )

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Traditional loss-based transports cannot meet the strict requirements of low latency and high throughput in data center networks (DCNs). Thus data center transmission control protocol (DCTCP) is proposed to better manage the congestion control in DCNs. To provide insight into improving the stability of the DCN, this paper focuses on the Hopf bifurcation analysis of a fluid model of DCTCP, and investigates the stability of the network. The round-trip time (RTT), being an effective congestion signal, is selected as the bifurcation parameter. And the network turns unstable and generates periodic solutions when the parameter is larger than the given critical value, which is given by explicit algorithms. The analytical results reveal the existence of Hopf bifurcation. Numerical simulations are performed to make a comparative analysis between the fluid model and the simplified model of DCTCP. The influence of other parameters on the DCN stability is also discussed.

Linear-quadratic optimal control for time-varying descriptor systems via space decompositions

吕鹏超, 黄俊杰, 刘波

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1011

摘要 ( 812 ) PDF (1663 KB)( 121 )

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This paper aims at solving the linear-quadratic optimal control problems ( LQOCP) for time-varying descriptor systems in a real Hilbert space. By using the Moore-Penrose inverse theory and space decomposition technique, the descriptor system can be rewritten as a new differential-algebraic equation (DAE), and then some novel sufficient conditions for the solvability of LQOCP are obtained. Especially, the methods proposed in this work are simpler and easier to verify and compute, and can solve LQOCP without the range inclusion condition. In addition, some numerical examples are shown to verify the results obtained.

Complex Network Modeling and Application

Node interdependent percolation of multiplex hypergraph with weak interdependence

张俊杰, 刘彩霞, 刘树新, 臧韦菲, 李倩

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1016

摘要 ( 810 ) PDF (3049 KB)( 138 )

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In recent years, there has been considerable attention and research on the higher-order interactions that are prevalent in various real-world networks. Hypergraphs, especially in the study of complex systems, are proved effective in capturing these interactions. To better characterize the model in reality, this paper proposes a theoretical model of node interdependent percolation in multiplex hypergraphs, considering “ weak ” interdependence. The proposed model includes pairwise and higher-order interactions, where the removal of nodes triggers cascading failures. However, interdependent nodes connected to failed nodes experience partial loss of connections due to “ weak” interdependence, reflecting the self-sustaining capabilities of real-world systems. Percolation theory is applied to the analysis to investigate the properties of the percolation threshold and phase transition. Both analysis and simulation results show that as the strength of interdependence between nodes weakens, the network transitions from a discontinuous to a continuous phase, thereby increasing its robustness.

Characteristics and modeling of UAV-vehicle MIMO wideband channels

梁晓林, 马佳旭, 曹旺斌, 徐建鹏, 刘帅奇, 赵雄文 ​

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1012

摘要 ( 699 ) PDF (2101 KB)( 102 )

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A geometry-based stochastic model ( GBSM) for unmanned aerial vehicle to vehicle ( UAV-V) multiple-input multiple-output (MIMO) wideband channel is proposed to investigate the characteristics of UAV-V channel. Based on the proposed model, a three-dimensional (3D) wideband channel matrix regarding channel numbers, time and delay is constructed. And some important channel characteristics parameters, such as power delay profile (PDP), root mean square ( RMS) delay spread, RMS Doppler spread, channel gain and Doppler power spectral density (PSD) are investigated with different vehicle velocities. It is much simpler and clearer compared with the complex analytical derivations. The results are compared with validated analysis to confirm the theoretical analysis.

Fairness optimization and power allocation in cognitive NOMA / OMA V2V network with imperfect SIC

梁晓林, 刘千龙, 曹旺斌, 刘帅奇, 赵淑欢, 赵雄文

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1020

摘要 ( 745 ) PDF (4592 KB)( 108 )

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In order to improve the reliability and resource utilization efficiency of vehicle-to-vehicle (V2V) communication system, in this paper, the fairness optimization and power allocation for the cognitive V2V network that takes into account the realistic three-dimensional (3D) channel are investigated. Large-scale and small-scale fading are considered in the proposed channel model. An adaptive non-orthogonal multiple access ( NOMA) / orthogonal multiple access (OMA) scheme is proposed to reduce the complexity of successive-interference-cancellation (SIC) in decoding and improve spectrum utilization. Also, a fairness index that takes into account each user’s requirements is proposed to indicate the optimal point clearly. In the imperfect SIC, the optimization problem of maximizing user fairness is formulated. Then, a subgradient descent method is proposed to solve the optimization problem with customizable precision. And the computational complexity of the proposed method is analyzed. The achievable rate, outage probability and user fairness are analyzed. The results show that the proposed adaptive NOMA / OMA (A-NOMA / OMA) outperforms both NOMA and OMA. The simulation results are compared with validated analysis to confirm the theoretical analysis.

Behavioral finance between the spot and futures markets based on multilayer network

张思聪, 戴建卓, 黄文静, 糜欣平

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1013

摘要 ( 1035 ) PDF (3117 KB)( 92 )

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In order to study the financial behavior of investors in the spot market, the transmission process of futures prices to spot prices is analyzed. Firstly, a coarse-graining method is proposed to construct a dual-layer coupled complex network of spot price and futures price. Then, to characterize the financial behavior of investors in the spot market, a price coupling strength indicator is introduced to capture investors' overreaction and underreaction behavior. The simulation results show that, despite the focus of researchers on arbitrage opportunities between futures and spot markets, investors in the spot market will not overreact or delay when the acceptance level of price fluctuations remains unchanged. On the contrary, when the stable coefficient of the price difference between the futures and spot markets remains unchanged, investors undergo a nonlinear process of overreaction followed by underreaction as their acceptance level of price fluctuations increases.

Performance analysis of different coding schemes for wideband vehicle-to-vehicle MIMO systems

梁晓林, 戎展毅, 曹旺斌, 刘帅奇, 赵雄文

中国邮电高校学报(英文), 2023, 30 (6). doi： 10.19682/j.cnki.1005-8885.2023.1017

摘要 ( 751 ) PDF (2637 KB)( 131 )

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The signal is subjected to lots of interferences in vehicle-to-vehicle (V2V) channel propagation, resulting in receiving error codes. Two-dimensional (2D) and three-dimensional (3D) geometrical channel models are used to depict the wideband V2V multiple-input multiple-output (MIMO) channels. Using the channel model, Turbo code and low-density parity-check (LDPC) code are investigated for wideband V2V MIMO system, and the encoding and the decoding schemes are investigated. The bit error rate (BER), channel capacity and outage probability of wideband V2V MIMO system using Turbo code and LDPC code are analyzed at different typical speeds. The results show that the performance of wideband V2V MIMO system using Turbo code outperform that using LDPC code. The performance is affected by transmitting and receiving speeds with the same coding scheme. And the channel capacity of the 3D channel is larger than that of 2D channel.