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Specific Neural coding of Complex Neural Network Based on time coding Under Various Exterior Stimuli

BIOMIMETICS 2025年第3期10卷 162页

作者： Guo, Lei Wang, Zhixian Song, Yihua Liu, Huan Hebei Univ Technol Sch Hlth Sci & Biomed Engn Tianjin Key Lab Bioelectromagnet Technol & Intelli Tianjin 300131 Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300131 Peoples R China

Specific neural coding (SNC) forms the basis of information processing in bio-brain, which generates distinct patterns of neural coding in response to corresponding exterior forms of stimulus. The performance of SNC is extremely dependent on brain-inspired models. However, the bio-rationality of a brain-inspired model remains inadequate. The purpose of this paper is to investigate a more bio-rational brain-inspired model and the SNC of this brain-inspired model. In this study, we construct a complex spiking neural network (CSNN) in which its topology has the small-word property and the scale-free property. Then, we investigated the SNC of CSNN under various strengths of various stimuli and discussed its mechanism. Our results indicate that (1) CSNN has similar neural time coding under same kind of stimulus;(2) CSNN has significant SNC based on time coding under various exterior stimuli;(3) our discussion implies that the inherent factor of SNC is synaptic plasticity.

关键词： spiking neural network complex network time coding specific neural coding synaptic plasticity

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Specific neural coding of fMRI spiking neural network based on time coding

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CHAOS SOLITONS & FRACTALS 2023年 174卷

作者： Guo, Lei Guo, Minxin Wu, Youxi Xu, Guizhi Hebei Univ Technol Sch Hlth Sci & Biomed Engn Hebei Key Lab Bioelectromagnet & Neuroengn Tianjin 300131 Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300131 Peoples R China Hebei Univ Technol Sch Artificial Intelligence Tianjin 300401 Peoples R China

Specific neural coding is the key to achieving advanced cognitive function in a bio-brain, which can form an identifying coding pattern for external stimulation. The performance of specific neural coding depends extremely on brain-like models. However, the bio-interpretability of the topology of a brain-like model is still insufficient. The purpose of this paper is to investigate a more biological interpretative brain-like model verified by the performance of specific neural coding. In this study, we used the topology constrained by human brain functional magnetic resonance imaging (fMRI) to construct a new spiking neural network (SNN) as a brain-like model called fMRI-SNN. In the fMRI-SNN, the nodes are Izhikevich neuron models, and the edges are synaptic plasticity models with time-delay. Then, we investigated the specific neural coding of fMRI-SNN, and discussed its mechanism. Our results indicated that: (i) fMRI-SNN has obvious specific neural coding based on time coding for different external stimulations. Furthermore, our discussion on relevance analysis implies that the intrinsic element of specific neural coding is synaptic plasticity. (ii) The specific neural coding of fMRI-SNN outperforms that of scale-free SNN and small-world SNN. Furthermore, our discussion on dynamic topological characteristics implies that the network topology is an element that impacts the performance level of the specific neural coding. (iii) Taking a speech recognition task as a case study, the performance of fMRI-SNN outperforms that of scale-free SNN and small-world SNN in terms of speech recognition accuracy.

关键词： Brain-like model Spiking neural network Functional magnetic resonance imaging time coding Specific neural coding Speech recognition

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Beam Steering Toward Multibeam Radiation by time-coding Metasurface Antennas

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 2024年第6期72卷 4829-4838页

作者： Nadi, Morteza Cheldavi, Ahmad Sedighy, Seyed Hassan Iran Univ Sci & Technol Dept Elect Engn Tehran *** Iran Iran Univ Sci & Technol Sch Adv Technol Tehran *** Iran

By demand enhancement in the cellular communications, critical needs for the next generation of the phased array antenna are grown. In this article, the time-modulated array is combined with the relatively recent coding metasurface theory to introduce time-coding metasurface antenna (TCMA). This innovative antenna design facilitates flexible spatial modulation of electromagnetic (EM) waves without using complicated feeding network and traditional phase shifter. Hence, it enables the generation of multiple concurrent but independent-directive high-gain beams to cover a predefined angular range, unlike the conventional array antenna which has its single-directive beam that covers only one user at cellular communication. The article focuses on the theoretical analysis of a TCMA designed with embedded 2-bit p-i-n diodes, which is also successfully fabricated. Applying various time sequences, the proposed array showcases the ability to steer beams at the center frequency and concurrently generate multiple beams at different frequencies, each with specific radiation angles. The flexibility and capability of the proposed metasurface antenna is used for different communication applications.

关键词： Metasurfaces Antenna arrays Harmonic analysis Antennas Frequency modulation time-frequency analysis Phased arrays Metasurface antenna multi-input and multioutput (MIMO) communication spatial division multiple access communication time coding

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On the Application of MIMO Space-time coding to Physical Layer Security in sub-6 GHz 5G 14

On the Application of MIMO Space-Time Coding to Physical Lay...

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14th Annual Conference System of Systems Engineering (SoSE)

作者： Ormond, Patrick Yerrapragada, Anil Kumar Kelley, Brian Univ Texas San Antonio Dept Elect & Comp Engn San Antonio TX 78249 USA

ISBN: (纸本)9781728104577

This paper investigates the application and performance improvement of MIMO Space time Block coding (STBC) for Physical Layer Security. The paper analyzes a Precoder Matrix Index (PMI) based scheme called Private Random Pre-coding (PRP). Key-based Physical Layer Security protects against eavesdroppers in wireless communication links, invaluable in emerging SG and IoT networks. This paper derives improvements in PRP based on STBC. Also presented are simulation results which show as much as 7 dB improvement in Key bit Error Rate performance vs SINR of the enhanced PRP-STBC scheme for a 1-bit codebook at the cost of decreased transmission rate. In addition, the paper derives a closed form expression for the Key bit Error Rate for both the PRP and enhanced PRP-STBC schemes as a function of dense SG cellular geometries. Furthermore, we present the effective information rate of the PRP key based communication framework in low SNR scenarios.

关键词： 5G mobile communication error statistics matrix algebra MIMO communication precoding space-time block codes telecommunication security space time block coding telecommunication security MIMO communication prediction coding matrix algebra Physical layer MSMB gene POTENTIALLY RESPONSIBLE PARTIES Error analysis time coding Information rates bit error rate performance

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Diversity-Multiplexing Tradeoff of Opportunistic Relaying Coded Cooperation and Distributed Space-time coding Coded Cooperation

Diversity-Multiplexing Tradeoff of Opportunistic Relaying Co...

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7th International Congress of Information and Communication Technology (ICICT)

作者： Kun, Xu Xiao, Li PLA Acad Natl Def Informat Jiefang Garden Rd 45 Wuhan 430010 Hubei Peoples R China

In this paper, we analyze the diversity-multiplexing tradeoff (DMT) performance of opportunistic relaying coded cooperation (ORCC) and distributed space-time coding coded cooperation (DSTCCC) with arbitrary number of relays. Exact DMT curves are derived for two scenarios, i.e., when the source is included in cooperation (denoted by S1) or not (denoted by S2), by formulating the problem as linear optimization problem. The DMT curves of ORCC and DSTCCC are found to be identical for S1 (or S2), and S1 has better DMT performance than S2. Numerical results are provided to illustrate the analysis as well.

关键词： Diversity-multiplexing tradeoff opportunistic relaying distributed space time coding coded cooperation

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A Multi-Step Furnace Temperature Prediction Model for Regenerative Aluminum Smelting Based on Reversible Instance Normalization-Convolutional Neural Network-Transformer

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PROCESSES 2024年第11期12卷

作者： Dai, Jiayang Ling, Peirun Shi, Haofan Liu, Hangbin Guangxi Univ Sch Elect Engn Nanning 530004 Peoples R China

In the regenerative aluminum smelting process, the furnace temperature is critical for the quality and energy consumption of the product. However, the process requires protective sensors, making real-time furnace temperature measurement costly, while the strong nonlinearity and distribution drift of the process data affect furnace temperature prediction. To handle these issues, a multi-step prediction model for furnace temperature that incorporates reversible instance normalization (RevIN), convolutional neural network (CNN), and Transformer is proposed. First, the self-attention mechanism of the Transformer is combined with CNN to extract global and local information in the furnace temperature data, thus addressing the strong nonlinear characteristics of the furnace temperature. Second, RevIN with learnable affine transformation is utilized to address the distribution drift in the furnace temperature data. Third, the temporal correlation of the prediction model is enhanced by a time-coding method. The experimental results show that the proposed model demonstrates higher prediction accuracy for furnace temperature at different prediction steps in the regenerative aluminum smelting process compared to other models.

关键词： reversible instance normalization (RevIN) convolutional neural network (CNN) Transformer time coding

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Research on MIMO space time coding for wireless optical communicayion system

Research on MIMO space time coding for wireless optical comm...

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Third International Conference on Cyberspace Technology (CCT 2015)

作者： Pengbo Yu Ruijing Wang Yanzhu Liu School of Computer and Communication Engineering University of Science and Technology Beijing(USTB) 100083 China

MIMO system is the basic principle of hollow when encoding, and then discussed emphatically in the MIMO system of FSO practical two space-time coding, OSTBC coding with REP coding. Introduces the basic principle of two kinds of coding, and in the case of the known a priori knowledge of channel was deduced BER expression, can be seen from the expression of conditional probability, REP space-time coding is superior to OSTBC space-time coding. After using Monte Carlo method of numerical simulation obtained the conclusion of the expression of conditional probability are verified.

关键词： MIMO Multiple input multiple output OSTBC Repeat Wireless optical communication multiple input multiple output systems space-time coding Wireless optical communication coding Conditional probability time coding

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Self-Coded Distributed Space-time coding for Two-way Full-Duplex Relay Networks

Self-Coded Distributed Space-Time Coding for Two-way Full-Du...

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IEEE Global Communications Conference

作者： Yi Liu Xiang-Gen Xia Zhiqiang Zhang Hailin Zhang State Key Laboratory of Integrated Service Network Xidian University Department of Electrical and Computer Engineering University of Delaware

ISBN: (纸本)9781479959532

In this paper, we consider two-way full-duplex (FD) relay networks, which allow relaying communications in both directions at the same time and over the same frequency band. We propose a distributed space-time coding scheme, which we call SC-DSTC (Self-Coded Distributed Space-time coding), where the main idea is to perform convolutional encoding at the relay node and form a distributed linear convolutional space-time code (DLC-STC) together with the direct link. The convolutional code at the relay is realized by using part of the residual loop interference (RLI), which produces an automatic convolutional encoder. The amplifying factor is optimized when the loop channel information is imperfect. Simulation results show that the proposed SC-DSTC scheme can achieve asynchronous full cooperative diversity and is robust to the error of the loop channel information.

关键词： time coding space-time coding differential space-time coding Trunk Node Relay networks FULL DUPLEX convolutional coding Distribute Bidirectional relay

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Adaptive Buffer-Aided Space-time coding for Multiple-Antenna Cooperative Wireless Networks

Adaptive Buffer-Aided Space-Time Coding for Multiple-Antenna...

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WSA 2015;19th International ITG Workshop on Smart Antennas

作者： Tong Peng Rodrigo C. de Lamare CETUC/PUC-RIO

In this work we propose an adaptive buffer-aided space-time coding scheme for cooperative wireless networks. A maximum likelihood receiver and adjustable code vectors are considered subject to a power constraint with an amplify-and-forward cooperation strategy. Each multiple-antenna relay is equipped with a buffer and is capable of storing the received symbols before forwarding them to the destination. We also present an adaptive relay selection and optimization algorithm, in which the instantaneous signal to noise ratio in each link is calculated and compared at the destination. An adjustable code vector obtained by a feedback channel at each relay is employed to form a space-time coded vector which achieves a higher coding gain than standard schemes. A stochastic gradient algorithm is developed to compute the parameters of the adjustable code vector with reduced computational complexity. Simulation results show that the proposed buffer-aided scheme and algorithm obtain performance gains over existing schemes.

关键词： Cooperative systems Buffer-aided relays Spacetime codes Relay selection cooperative systems Wireless networks signal to noise ratios feedback channel space-time coding relay time coding destination TUNABLE coding gain Self tuning Codes

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Reconfigurable Intelligent Surfaces: Simplified-Architecture Transmitters--From Theory to Implementations

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PROCEEDINGS OF THE IEEE 2022年第9期110卷 1266-1289页

作者： Cheng, Qiang Zhang, Lei Dai, Jun Yan Tang, Wankai Ke, Jun Chen Liu, Shuo Liang, Jing Cheng Jin, Shi Cui, Tie Jun Southeast Univ State Key Lab Millimeter Waves Nanjing 210096 Peoples R China Southeast Univ Natl Mobile Commun Res Lab Nanjing 210096 Peoples R China

Reconfigurable intelligent surfaces (RISs) offer an entirely new route to alter the propagation properties of electromagnetic waves and thus control their reflection, refraction, and scattering features in arbitrary manners. Such physical attributes are perceived to bring about fundamental influence on the modern wireless communication system due to the possibilities to establish artificial and controllable propagation environments for radio signals, which no longer rely on the complex encoding, decoding, and other signal processing techniques. Recent studies reveal that the wave manipulation is not the only skill of the RISs. With the rapid developments of space-time digital metasurface and information metasurface, there has been increasing attention focused on the information manipulation via these artificial surfaces. In this article, we provide an overview of the theoretical models of the space-time digital metasurface and information metasurface, the mechanisms of wavefront shaping, and the signal modulations in space and time domains during the wave-matter interactions. We will also address some practical issues during implementations of the reconfigurable intelligent metasurfaces and the associated hardware architectures at microwave frequencies to realize simplified radio frequency transmitters. Several modulation schemes and the corresponding demonstration systems are introduced to illustrate the powerful abilities of the reconfigurable intelligent metasurfaces. Potential research directions of this technique are briefly discussed for their potential applications in future wireless networks.

关键词： Metasurfaces Encoding Harmonic analysis Surface waves time-domain analysis P-i-n diodes Surface impedance Digital-coding metasurface information metasurface reconfigurable intelligent surface (RIS) space coding spectral modulation time coding transmitter wavefront shaping wireless network

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