Recurrences Reveal Shared Causal Drivers of Complex Time Series by William Gilpin

“…We introduce a physics-based unsupervised learning algorithm that reconstructs causal drivers by iteratively building a recurrence graph with glasslike structure. …”
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A peak-to-average power ratio reduction method for mixed-numerology multi-carrier systems by Nan SHI, Xiaoran LIU, Jun XIONG, Xiaoying ZHANG, Jibo WEI

“…In order to support diverse service demands of communication scenarios, 5G adopts the mixed-numerology system based on orthogonal frequency division multiplexing (OFDM).The mixed-numerology systems still have the problem of high peak-to-average power ratio (PAPR).Furthermore, its design structure makes it difficult to apply traditional PAPR suppression methods straight forwardly, in which mixed signals are generated by superimposing multiple sub-signals with different parameters.An optimization model for minimizing PAPR in mixed-numerology systems was established based on tone reservation method.Utilizing the characteristic of single-peak of time-domain kernel, the multiple copies were generated in different numerologies based on the peak position of the mixed signal.The mixed time-domain kernel was then superimposed to reduce the peaks of the mixed signal.Since the proposed algorithm didn’t require inverse fast Fourier transform (IFFT)/ fast Fourier transform (FFT) operations during iteration, it had relatively low computational complexity.Simulation results show that the proposed algorithm effectively reduces the PAPR of mixed signals.…”
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Convergence Rates of Gradient Methods for Convex Optimization in the Space of Measures by Chizat, Lénaïc

“…Under basic regularity assumptions, we show that the suboptimality gap at iteration $k$ is in $O(\log (k)k^{-1})$ for multiplicative updates, while it is in $O(k^{-q/(d+q)})$ for additive updates for some $q\in \lbrace 1,2,4\rbrace $ determined by the structure of the objective function. …”
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A Progressive Combined Variable Selection Method for Near-Infrared Spectral Analysis Based on Three-Step Hybrid Strategy by Hongmin Sun, Fanze Kong, Cheng Xiu, Weizheng Shen, Yan Wang

“…By analyzing functions of each step and characteristics of various variable selection methods, synergy interval partial least squares, iterative variable subset optimization, and bootstrapping soft shrinkage were chosen for three steps. …”
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MP-Start:bandwidth measurement based and phase-divided TCP slow start mechanism by DENG Xiao-heng1, CHEN Zhi-gang1, ZHANG Lian-ming1, ZENG Bi-qing1

“…To set appropriate threshold value（ssthresh） of slow start and eliminate network oscillation caused by bursty traffic,a new measurement-based and phase-divided slow start mechanism was proposed,which was called MP-Start.MP-Start employs effective online bandwidth measurement technology to update the ssthresh with appropriate value dy-namically,and adjusts the increment of congestion window（cwnd） in different phase of the startup.MP-Start increases cwnd with half of the difference between ssthesh and cwnd,iterates and gradually closes up ssthresh,of which the incre-ment is small at start phase and end phase and comparatively large at the middle phase of the startup of a connection,the largest increment is no more than one quarter of ssthresh.In order to improve the performance of this algorithm,a flexi-ble parameterized model and an adaptive parameter setting solution are designed.And series simulation experiments in-dicate that MP-Start significantly decreases dropped packets,data transforming time,packet queue length of shared link,and also improves network performance and smoothness of connections.…”
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The evolution of NB-IoT standard system and development of Internet of things industry by Yunzhou XIE

“…Looking at the development of the Internet of things industry system,the birth of NB-IoT standard is the inevitable product of the development of the Internet of things.But in the development process of NB-IoT standard,it has gone through the business interests of the game,the market environment competition,and the secret contest of various groups,eventually forming a 3GPP international standard that people all accept.Different from the multi country and multi system pattern of wireless communication in the past,NB-IoT is a globally unified Internet of things wireless communication network.With the freeze of the Rel-13 version and the iterative evolution of the Rel-14 and Rel-15 versions,NB-IoT technology will also be the basis for the future 5G Internet of things standard system.From the perspective of the development of the whole pattern,the NB-IoT standard will be more suitable for the application scenarios of the Internet of things.The evolution of NB-IoT standard system and development of Internet of things industry were analyzed,which helped readers understand the super impetus of technology development to industry transformation.…”
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Distributed Channel-Aware Quantization Based on Maximum Mutual Information by Sahar Movaghati, Masoud Ardakani

“…In this work we jointly design the local quantizers by maximizing the mutual information as the optimization criterion, so that the quantized measurements carry the most information about the unknown parameter. A low-complexity iterative approach is suggested for finding the local quantization rules. …”
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AOA, Delay, and Complex Propagation Factor Estimation for the Monostatic MIMO Radar System by Saleh O. Al-Jazzar, Sami Aldalahmeh

“…In contrast to conventional iterative computationally demanding estimation schemes, we propose a closed form solution for most of the previous parameters. …”
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Reinforcement Learning-Based Autonomous Soccer Agents: A Study in Multi-Agent Coordination and Strategy Development by Biplov Paneru, Bishwash Paneru, Ramhari Poudyal, Khem Poudyal

“…During training, agents interacted with the soccer environment, iteratively changing their Q-values in response to observable rewards and behaviors. …”
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Multi-values discrete particle swarm optimization for cross layer resource allocation in cooperative OFDMA systems by Wei LI, Chun-lin XIONG, De-gang WANG, Xiao-ying ZHANG, Ji-bo WEI

“…The proposed MDPSO can also be applied widely to solve the combinatorial optimization problems (COP). Furthermore, iterative waterfilling was used to complete power allocation. …”
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Improvement of Student Weariness Emotion in English Classroom Based on Intelligent Internet of Things and Big Data Technology by Ya Pang

“…In addition, this paper proposes a Fast Point Feature Histogram, which uses an iterative closest point fine registration algorithm for image registration. …”
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Mobility aware edge service migration strategy by Dapeng WU, Ji LYU, Zhidu LI, Ruyan WANG

“…To address the problem of load imbalance among edge servers and quality of service degradation caused by dynamic changes of user locations in mobile edge computing networks,a mobility aware edge service migration algorithm was proposed.Firstly,the optimization problem was formulated as a mix integer nonlinear programming problem,with the goal of minimizing the perceived delay of user service request.Then,the delay optimization problem was decoupled into the edge service migration and edge node selection sub-problems based on the Lyapunov optimization approach.Thereafter,the fast edge decision algorithm was proposed to optimize the resource allocation and edge service migration under a given radio access strategy.Finally,the asynchronous optimal response algorithm was proposed to iterate out the optimal radio access strategy.Simulation results validate the proposed algorithm can reduce the perceived delay under the service migration cost constraint while comparing with other existing algorithms.…”
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Hybrid precoding with sub-connected architecture for millimeter wave massive MIMO system by Haiyan CAO, Xiaohui YANG, Wenjuan HU, Zichang MA, Fangmin XU, Xin FANG

“…A hybrid precoding scheme in the millimeter wave massive MIMO system was proposed with sub-connected architecture at the transmitter and digital combining at the receiver.In this scheme,the digital precoder and combiner were designed based on the singular value decomposition (SVD) of the equivalent channel matrix,while the optimal analog precoder was obtained by blocking the equivalent channel to maximize spectral efficiency according to the block diagonalization.Considering the hardware cost and power consumption,the precoding scheme with sub-connected architecture at the receiver was further proposed.Otherwise,the analog precoder and combiner were iteratively updated.Simulation results show that the proposed scheme which focuses on the digital combining at the receiver has better performance than successive interference cancelation (SIC)-based hybrid precoding.In addition,though the proposed scheme which focuses on the hybrid combining with sub-connected architecture at the receiver has worse performance than SIC-based hybrid precoding,the power consumption and hardware cost are greatly reduced.…”
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STUDY ON THE COMPILATION OF TYPICAL EXCITATION SPECTRUM OF SUSPENSION DYNAMIC K＆C TEST by FENG JinZhi, FU DaoQi, ZHENG SongLin, ZHENG GuangLei, XUE HaiLong, LIN Yang

“…The traditional quasi-static K＆C characteristic test can not reflect the hysteresis effect caused by shock absorber damping and bushing viscoelasticity comprehensively and effectively, but the suspension dynamic K＆C characteristic test can make up the deficiency of the quasi-static characteristic test.Development of dynamic K＆C test involves two aspects of excitation spectrum and performance evaluation of the research content, in this paper, A class A sedan for the study of the carrier, through A skid pad road load spectrum sampling test and simulation analysis, through the bench test iterations, designed the suspension K＆C dynamic characteristic test of typical excitation spectrum, and its validity is verified by bench test and virtual test.The results show that the dynamic characteristics of the suspension can be reflected effectively by using the typical excitation spectrum designed in this paper, which provides some support for the research of wheel positioning parameters and the development of K＆C test technology.…”
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Low-power transmission method for uplink millimeter-wave massive MIMO-NOMA system based on GSIC by Hui WANG, Qixin TAI, Liu LIU, Hong WANG, Rongfang SONG

“…The combination of non-orthogonal multiple access (NOMA) and millimeter-wave (mmWave) massive multiple-input multiple-output (MIMO) can meet the requirements for huge throughput and massive connectivity in future wireless communication network.The total system power minimization for uplink mmWave massive MIMO-NOMA was studied, and a novel framework for a hybrid beamforming mmWave massive MIMO-NOMA uplink transmission system was proposed based on group-level successive interference cancellation (GSIC).Specifically, users were grouped according to channel gain, intergroup users being served by NOMA and intra group users being served by space division multiple access.By designing analog beamforming matrices for different groups and performing joint optimization for digital beamforming and power control, a parallel iterative algorithm was proposed to solve the optimization problem.Simulation results show that the proposed method outperforms the conventional mmWave massive MIMO-NOMA based on clustering and user-level SIC in terms of total power consumption.…”
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RIS-assisted multi-user beam tracking system and hardware experiment by DING Chenlong, XU Wenjun, ZHANG Hongtao

“…To enhance the applicability of RIS in multi-user mobile scenarios, an innovative inverse diffraction-based field source iterative model was proposed to rapidly generate near- and far-field multi-user control codebooks. …”
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Sparse adaptive constant blind equalization algorithm for sparse multipath channel by Si-yang MA, Hua PENG, Bin WANG

“…In order to improve the convergence rate of the blind equalizer for sparse multipath channel,a novel blind equalization approach called l₀-norm constraint proportionate normalized least mean square constant algorithm was proposed for M-order phase-shift keying (MPSK) signal.Based on the constant modulus characteristics of MPSK signal and the sparse property of equalizer,a new blind equalization cost function with the l₀-norm penalty on the equalizer tap coefficients was firstly constructed.Then the update formula of the tap coefficients was derived according to the gradient descent algorithm.Moreover,the iteration step was updated by drawing upon the normalized proportionate factor.The algorithm not only assigned step sizes proportionate to the magnitude of the current individual tap weights,but also attracted the inactive taps to zero adaptively.Theoretical analysis and simulation results show that the proposed algorithm outperforms the existing blind equalization algorithms for sparse channel in reducing ISI and improving convergence rate.…”
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Towards edge-collaborative, lightweight and privacy-preserving classification framework by Jinbo XIONG, Yongjie ZHOU, Renwan BI, Liang WAN, Youliang TIAN

“…Aiming at the problems of data leakage of perceptual image and computational inefficiency of privacy-preserving classification framework in edge-side computing environment, a lightweight and privacy-preserving classification framework (PPCF) was proposed to supports encryption feature extraction and classification, and achieve the goal of data transmission and computing security under the collaborative classification process of edge nodes.Firstly, a series of secure computing protocols were designed based on additive secret sharing.Furthermore, two non-collusive edge servers were used to perform secure convolution, secure batch normalization, secure activation, secure pooling and other deep neural network computing layers to realize PPCF.Theoretical and security analysis indicate that PPCF has excellent accuracy and proved to be security.Actual performance evaluation show that PPCF can achieve the same classification accuracy as plaintext environment.At the same time, compared with homomorphic encryption and multi-round iterative calculation schemes, PPCF has obvious advantages in terms of computational cost and communication overhead.…”
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Gear Cutting Machining of Klingelnberg Cyclo-palloid Bevel Gear based on Monolithic Cutter Disc by Wang Zhiyong, Yang Weiyin, Zhang Yu, Zhai Huaming

“…According to the structure parameters of two-part cutters,the method for designing cutter-head and cutter blade of monolithic cutter disc is proposed.According to the curvature relationship between the meshed tooth flanks,a method for determining the amount of modification of cutter radius is established by iteration algorithm. According to the cutting principle and gear meshing theory,the formula for calculating the machine setting parameters and cutter parameters are derived.The processing experiment is completed on domestic CNC spiral bevel gear cutting machine with monolithic cutter disc. …”
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Spatiotemporal chaotic one-way Hash function construction based on coupled tent maps by LIU Jian-dong, FU Xiu-li

“…A novel coupled tent maps-based spatiotemporal chaotic cryptographic Hash function was proposed.Compared with the discrete tent map,the coupled discrete tent spatiotemporal chaotic maps have longer computer-realization-period,nearly uniform distribution and desired diffusion and confusion properties.Based on the coupled discrete tent spatiotemporal chaotic maps,a cryptographic Hashing function is constructed to generate 128-bit Hash value from a message with arbitrary length.The approach uses the initial value of coupled discrete tent chaotic dynamical system iteration as the secret key.The key space is very large.There is a high sensitivity and complex and strongly nonlinear coupling relation between the Hash value and the corresponding message and secret key.Theoretic analysis and simulation results are shown that the approach possess not only extremely high security in comparison with earlier chaotic Hash functions,but also the high execution speed.Therefore,the approach can satisfy all the performance requirements of Hash function,such as one-way,key sensitivity and collision resistance.…”
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