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Experimental measurement of link gain and correlation in a single-input multiple-output ultraviolet communication system with diversity reception

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OPTICAL ENGINEERING 2017年第8期56卷

作者： Han, Dahai Zhang, Min Li, Qing Beijing Univ Posts & Telecommun State Key Lab Informat Photon & Opt Commun Opt Wireless Commun Grp Beijing Peoples R China

The experiment is designed and taken to measure the link gain in a single-input multiple-output ultraviolet (UV) communication system with diversity reception, and the correlation of multichannel is also taken into account. Theoretical and experimental research on the multireceiver UV communication system suggests that diversity reception is an effective way to gain high BER performance even if the link gain correlation is non-negligible (with normal level correlation coefficient). The link gain of diversity reception is compared particularly with the gain from expanding the detecting area to find its boundary for performance improvement and the distance limit between receivers. The experimental results provide more reliable guidelines for receiver design in UVC systems and other scattering wireless optical communication channels with diversity reception applied such as multiple-input multiple-output. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： single-input multiple-output ultraviolet communication diversity reception correlation

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High-Efficiency-Isolated single-input multiple-output Bidirectional Converter

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2015年第9期30卷 4914-4930页

作者： Wai, Rong-Jong Liaw, Jun-Jie Yuan Ze Univ Dept Elect Engn Chungli 32003 Taiwan

This study presents a high-efficiency-isolated single-input multiple-output bidirectional (HISMB) converter for a power storage system. According to the power management, the proposed HISMB converter can operate at a step-up state (energy release) and a step-down state (energy storage). At the step-up state, it can boost the voltage of a low-voltage input power source to a high-voltage-side dc bus and middle-voltage terminals. When the high-voltage-side dc bus has excess energy, one can reversely transmit the energy. The high-voltage dc bus can take as the main power, and middle-voltage output terminals can supply powers for individual middle-voltage dc loads or to charge auxiliary power sources (e.g., battery modules). In this study, a coupled-inductor-based HISMB converter accomplishes the bidirectional power control with the properties of voltage clamping and soft switching, and the corresponding device specifications are adequately designed. As a result, the energy of the leakage inductor of the coupled inductor can be recycled and released to the high-voltage-side dc bus and auxiliary power sources, and the voltage stresses on power switches can be greatly reduced. Moreover, the switching losses can be significantly decreased because of all power switches with zero-voltage-switching features. Therefore, the objectives of high-efficiency power conversion, electric isolation, bidirectional energy transmission, and various output voltage with different levels can be obtained. The effectiveness of the proposed HISMB converter is verified by experimental results of a kW-level prototype in practical applications.

关键词： Bidirectional converter coupled inductor electric isolation high-efficiency power conversion single-input multiple-output zero voltage switching

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Modulation Classification of single-input multiple-output Signals Using Asynchronous Sensors

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IEEE SENSORS JOURNAL 2015年第1期15卷 346-357页

作者： Su, Wei US Army Commun Elect Res Dev & Engn Ctr Aberdeen MD 21001 USA

This paper discusses the automatic modulation classification of weak communication signals using distributed low-cost sensors. The concept of a secondary user in sensor networks is presented and very high-order statistics are used as modulation features. Two feature-based methods, single-variable and multivariable modulation classifiers, are proposed for estimating unknown modulation schemes through single-input multiple-output signal sensing channels. The new approaches acquire multiple signal observations collected from distributed sensors and leverage the channel diversity to enhance signal power and reduce bias in estimation. The experiment demonstrates that the network centric modulation classifier achieves significantly improved performance in terms of probability of correct classification than the current state-of-the-art single sensor modulation classifier, and the multivariable modulation classifier is more robust to the channel parameter variations than the single-variable classifier.

关键词： Cognitive radio distributed sensors high-order statistics modulation classification spectrum sensing sensor network single-input multiple-output

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Adaptive Bayesian space-time equalisation for multiple receive-antenna assisted single-input multiple-output systems

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DIGITAL SIGNAL PROCESSING 2008年第4期18卷 622-634页

作者： Chen, S. Liu, S. Hanzo, L. Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

This contribution considers nonlinear space-time equalisation (STE) for multiple receive-antenna induced single-input multiple-output (SIMO) systems. By exploiting the inherent symmetry of the underlying optimal Bayesian STE solution, a novel symmetric radial basis function (RBF) based STE scheme is proposed, which is capable of approaching the optimal Bayesian equalisation performance. Adaptive implementation of this symmetric RBF (SRBF) based STE can be achieved conveniently by estimating the SIMO channels using the least mean square channel estimator and computing the optimal RBF centres from the resulting SIMO channel matrix estimate. Simulation results also demonstrate that the performance of this SRBF based STE is robust with respect to the choice of the RBF variance value. The proposed adaptive solution is then extended to the space-time decision feedback equalisation (ST-DFE) structure. (C) 2007 Elsevier Inc. All rights reserved.

关键词： multiple antennas single-input multiple-output space-time equaliser space-time decision feedback equaliser Bayesian equaliser symmetric radial basis function network

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Design of High-Frequency single-input multiple-output Wireless Power Transfer System with Parasitic Capacitance of Coupled Coils 13

Design of High-Frequency Single-Input Multiple-Output Wirele...

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13th International Conference on Renewable Energy Research and Applications

作者： Akasaka, Tomoya Miura, Masamichi Nukaga, Hayato Wei, Xiuqin Chiba Inst Technol Dept Elect & Elect Eng Chiba Japan

ISBN: (纸本)9798350375596;9798350375589

This paper presents a design for a high-frequency single-input multiple-output (SIMO) wireless power transfer (WPT) system that incorporates the parasitic capacitance of coupled coils. Additionally, the effect of the mutual inductance among the receiving coils is considered in the design. To evaluate the feasibility and effectiveness of the proposal, a SIMO WPT system using a class-E inverter as the transmitter and two resistive loads as receivers is designed and tested. The switch-voltage waveforms in both the numerical calculations and experiment meet the class-E Zero-Voltage-Switching / Zero-Derivative-Switching (ZVS/ZDS) conditions, enabling a high power-transmission efficiency at a high frequency. Furthermore, the calculated results are consistent with the experimental ones, validating the proposal. The results also highlight the significance of accounting for coil-coupled parasitic capacitance in the design of high-frequency SIMO WPT systems.

关键词： Class-E inverter parasitic capacitance of coupled coils single-input multiple-output wireless power transfer Zero-Voltage-Switching / Zero-Derivative-Switching

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A joint estimation algorithm for single-input multiple-output underwater acoustic communications

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SIGNAL PROCESSING 2024年 220卷

作者： Tong, Wentao Ge, Wei Han, Xiao Yin, Jingwei Harbin Engn Univ Natl Key Lab Underwater Acoust Technol Harbin 150001 Peoples R China Harbin Engn Univ Key Lab Polar Acoust & Applicat Minist Educ Harbin 150001 Peoples R China Harbin Engn Univ Coll Underwater Acoust Engn Harbin 150001 Peoples R China Harbin Engn Univ Qingdao Innovat & Dev Ctr Qingdao 266400 Peoples R China Chinese Acad Sci Inst Acoust State Key Lab Acoust Beijing 100190 Peoples R China

In single-input multiple-output (SIMO) underwater acoustic (UWA) communications, the receiver based on passive time reversal (PTR) combined with decision feedback equalizer (DFE) is widely used but has a limited performance. A multi-channel joint estimation algorithm based on sparse Bayesian learning (MJSBL) is proposed in this paper to exploit the diverse gain from multi-channels, where reasonable prior distribution functions are selected for parameters in the probabilistic model. Afterwards, the algorithm is derived by the mean-field variational inference (VI), iteratively updating the estimation of symbols, channels and noise variation. As a result, the maximum likelihood estimation of the dictionary matrix, as well as the maximum posterior estimation of the channel vectors and noise variance, can be approximated. Simulation and experimental results verify that compared to typical single-channel and multi-channel algorithms, the systems always have lower bit error rates (BERs) and symbol error rates (SERs) with the MJSBL algorithm for different communications distances and symbol block lengths.

关键词： single-input multiple-output Joint estimation Variational inference Sparse Bayesian learning Underwater acoustic communication

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Optimal Terminations for a single-input multiple-output Resonant Inductive WPT Link

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ENERGIES 2020年第19期13卷

作者： Monti, Giuseppina Mongiardo, Mauro Minnaert, Ben Costanzo, Alessandra Tarricone, Luciano Univ Salento Dept Engn Innovat I-73100 Lecce Italy Univ Perugia Dept Engn I-06123 Perugia Italy Odisee Univ Dept Ind Sci & Technol Coll Appl Sci B-9000 Ghent Belgium Univ Bologna Dept Elect Elect & Informat Engn Guglielmo Marcon I-40126 Bologna Italy

This paper analyzes a resonant inductive wireless power transfer link using a single transmitter and multiple receivers. The link is described as an (N+1)-port network and the problem of efficiency maximization is formulated as a generalized eigenvalue problem. It is shown that the desired solution can be derived through simple algebraic operations on the impedance matrix of the link. The analytical expressions of the loads and the generator impedances that maximize the efficiency are derived and discussed. It is demonstrated that the maximum realizable efficiency of the link does not depend on the coupling among the receivers that can be always compensated. Circuital simulation results validating the presented theory are reported and discussed.

关键词： resonant wireless power transfer inductive coupling optimal load single-input multiple-output power gain

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Constant modulus algorithm aided soft decision directed scheme for blind space-time equalisation of SIMO channels

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SIGNAL PROCESSING 2007年第11期87卷 2587-2599页

作者： Chen, S. Wolfgang, A. Hanzo, L. Univ Southampton Sch Elect & Comp Sci Southampton SO17 1BJ Hants England

This paper investigates a blind space-time equaliser (STE) designed for single-input multiple-output (SIMO) systems that employ high-throughput quadrature amplitude modulation schemes. A constant modulus algorithm (CMA) aided soft decision-directed (SDD) scheme, originally derived for low-complexity blind equalisation of single-input single-output channels, is extended to the SIMO scenario. Simulations are conducted to compare the performance of this blind adaptive scheme with another low-complexity blind STE referred to as the CMA aided decision directed (DD) scheme. The results obtained demonstrate that for SIMO systems the CMA aided SDD scheme exhibits advantages over the CMA aided DD arragement, in terms of its faster convergence speed and lower computational complexity.(c) 2007 Elsevier B.V. All rights reserved.

关键词： single-input multiple-output space-time equalisation quadrature amplitude modulation constant modulus algorithm decision-directed adaptation

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Bit error rate analysis of free-space optical system with spatial diversity over strong atmospheric turbulence channel with pointing errors

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OPTICAL ENGINEERING 2014年第12期53卷

作者： Krishnan, Prabu Kumar, D. Sriram Natl Inst Technol Dept Elect & Commun Engn Tiruchirappalli 620015 Tamil Nadu India

Free-space optical communication (FSO) is emerging as a captivating alternative to work out the hindrances in the connectivity problems. It can be used for transmitting signals over common lands and properties that the sender or receiver may not own. The performance of an FSO system depends on the random environmental conditions. The bit error rate (BER) performance of differential phase shift keying FSO system is investigated. A distributed strong atmospheric turbulence channel with pointing error is considered for the BER analysis. Here, the system models are developed for single-input, single-output-FSO (SISO-FSO) and single-input, multiple-output-FSO (SIMO-FSO) systems. The closed-form mathematical expressions are derived for the average BER with various combining schemes in terms of the Meijer's G function. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： free-space optics differential phase shift keying strong atmospheric turbulence single-input multiple-output

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Analysis and Design of Cyclic Switched-Capacitor DC-DC Converters

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS 2019年第8期66卷 3227-3237页

作者： Datta, Kishalay Menezes, Vinod Pavan, Shanthi Indian Inst Technol Madras Dept Elect Engn Chennai 600036 Tamil Nadu India Texas Instruments India Ltd Bengaluru 560093 India

We introduce the cyclic switched-capacitor dc-dc converter for single-input multiple-output power delivery. We focus on applications in stacked voltage domain (SVD)-based systems, and show that the cyclic architecture is robust to load current mismatches. We analyze such converters and give intuition for their power losses. We give experimental results from an SVD based power management integrated circuit (PMIC), designed and fabricated in a 130nm CMOS technology. The PMIC is a combination of a 2/3 stage reconfigurable cyclic SC dc-dc converter and a linear regulator. It can drive 3x3mA loads with the input supply voltage varying from 2.35-3.65V.

关键词： DC-DC power converters switched capacitor circuits single-input multiple-output voltage regulators charge recycling voltage stacking power management

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