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Comparison of closed-loop system identification techniques to quantify multi-joint human balance control

ANNUAL REVIEWS IN CONTROL 2016年 41卷 58-70页

作者： Engelhart, D. Boonstra, T. A. Aarts, R. G. K. M. Schouten, A. C. van der Kooij, H. Univ Twente Dept Biomech Engn MIRA Inst Biomech Technol & Tech Med NL-7500 AE Enschede Netherlands Univ Twente Dept Mech Automat NL-7500 AE Enschede Netherlands Delft Univ Technol Dept Biomech Engn NL-2628 CD Delft Netherlands

The incidence of impaired balance control and falls increases with age and disease and has a significant impact on daily life. Detection of early-stage balance impairments is difficult as many intertwined mechanisms contribute to balance control. Current clinical balance tests are unable to quantify these underlying mechanisms, and it is therefore difficult to provide targeted interventions to prevent falling. System identification techniques in combination with external disturbances may provide a way to detect impairments of the underlying mechanisms. This is especially challenging when studying multi joint coordination, i.e. the contribution of both the ankles and hips to balance control. With model simulations we compared various existing non-parametric and parametric system identification techniques in combination with external disturbances and evaluated their performance. All methods are considered multi-segmental (both the ankles and the hips contribute to maintaining balance) closed-loop balance control. Validation of the techniques was based on the prediction of time series and frequency domain data. Parametric system identification could not be applied in a straightforward manner in human balance control due to assumed model structure and biological noise in the system. Although the time series were estimated reliably, the dynamics in the frequency domain were not correctly estimated. Non-parametric system identification techniques did estimate the underlying dynamics of balance control reliably in both time and frequency domain. The choice of the external disturbance signal is a trade-off between frequency resolution and measurement time and thus depends on the specific research question and the studied population. With this overview of the applicability as well as the (dis)advantages of the various system identification techniques, we can work toward the application of system identification techniques in a clinical setting. (C) 2016 International Federati

关键词： Balance control multiple-input multiple-output Closed-loop System identification

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Large Spatial Channel (36-Core x 3 mode) Heterogeneous Few-Mode Multicore Fiber

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2016年第1期34卷 93-103页

作者： Sakaguchi, Jun Klaus, Werner Mendinueta, Jose Manuel Delgado Puttnam, Benjamin James Luis, Ruben Soares Awaji, Yoshinari Wada, Naoya Hayashi, Tetsuya Nakanishi, Tetsuya Watanabe, Tatsuhiko Kokubun, Yasuo Takahata, Taketoshi Kobayashi, Tetsuya Natl Inst Informat & Commun Technol NICT Photon Network Res Inst Koganei Tokyo 1848795 Japan Sumitomo Elect Ind Ltd Yokohama Kanagawa 2448588 Japan Yokohama Natl Univ Yokohama Kanagawa 2408501 Japan Optoquest Co Ltd Ageo Saitama 362021 Japan

We describe the design and characterization of a heterogeneous 36-core, three-mode fiber with three core types. Intercore crosstalk for LP11 modes is estimated to be below-31 dB for 5.5 km propagation at a core pitch of 34 mu m. Feasibility of 108 space/mode division multiplexed transmission is investigated using free-space multiplexing/demultiplexing technologies, 40-wavelength division multiplexed, 25 GBd, 93.4-Gb/s dual-polarization QPSK signals, and coherent detection with a sparse 6 x 6 MIMO equalizer. The total transmission capacity amount to 403.7 Tb/s.

关键词： Coherent communication few-mode fiber mode division multiplexing multicore fiber multiple-input multiple-output optical fibers space division multiplexing

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Modulation classification for MIMO systems: State of the art and research directions

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CHAOS SOLITONS & FRACTALS 2016年 89卷 497-505页

作者： Bahloul, Mohammad Rida Yusoff, Mohd Zuki Abdel-Aty, Abdel-Haleem Saad, M. Naufal M. Al-Jemeli, Marwan Univ Teknol PETRONAS Dept Elect & Elect Engn Ctr Intelligent Signal & Imaging Res Perak Malaysia Al Azhar Univ Fac Sci Phys & Comp Dept Assiut Egypt Limkokwing Univ Creat Technol Fac Informat & Commun Technol Cyberjaya Malaysia

Blind techniques and algorithms for multiple-input multiple-output (MIMO) signals interception have recently attracted a great deal of research efforts. This is due to their important applications in the military and civil telecommunications domains. One essential step in the signal interception process is to blindly recognize the modulation scheme of the MIMO signals. This process is formally called Modulation Classification (MC). This paper discusses the modulation classification for MIMO systems and presents a comprehensive and critical literature review of the existing MC algorithms for MIMO systems;where possible, gaps in the knowledge base are identified and future directions for the research work are suggested. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： Modulation classification multiple-input multiple-output Statistical features Pattern recognition

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A hybrid envelope fluctuations reduction approach using multilayer neural network for MIMO-OFDM signals

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WIRELESS NETWORKS 2016年第8期22卷 2705-2712页

作者： Pachori, Khushboo Mishra, Amit Jaypee Univ Engn & Technol Dept Elect & Commun Engn Guna 473226 MP India Thapar Univ Dept Elect & Commun Engn Patiala 147004 Punjab India

One of the major drawback in multi-carrier signals is large envelope fluctuations i.e., high peak-to-average power ratio (PAPR). The objective of this paper is to propose neural network based active gradient project sequence, a computationally efficient hybrid method to reduce PAPR in multiple-input multiple-output orthogonal frequency division multiplexing system without sacrificing BER performance. In this paper, a neural network based trained module of approximate gradient project scheme (AGP-NN) is combined in parallel with partial transmit sequence method. The Levenberg-Marquardt training algorithm is used to train neural network based AGP module. The simulation results show that the proposed technique not only outperforms other conventional techniques but also offers less computational complexity.

关键词： multiple-input multiple-output Levenberg-Marquardt algorithm Partial transmit sequence Approximate gradient project

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Joint Dimming Control and Transceiver Design for MIMO-Aided Visible Light Communication

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IEEE COMMUNICATIONS LETTERS 2016年第11期20卷 2193-2196页

作者： Li, Baolong Zhang, Rong Xu, Wei Zhao, Chunming Hanzo, Lajos Southeast Univ Natl Mobile Commun Res Lab Nanjing 210096 Jiangsu Peoples R China Univ Southampton Sch ECS Southampton Wireless Southampton SO17 1BJ Hants England

The multiple-input multiple-output (MIMO) concept has been readily invoked in visible light communication (VLC) for increasing data rate. In this letter, we conceive a general solution of dimming control and MIMO transceiver design for VLC, which is capable of minimizing the mean-squared error between the transmitted and received signals, while at the same time, maintaining a specific indoor illumination level. We take into consideration practical optical constraints in the design, including the LED non-linearity and the specific dimming requirements. An efficient solution of our design problem is derived by conceiving a projected gradient algorithm. Our numerical results show that the proposed scheme achieves better bit error rate performance as well as significantly higher convergence speed than its benchmarker conceived in 2015.

关键词： multiple-input multiple-output visible light communication transceiver mean-squared error

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Low complexity MIMO method based on matrix transformation for few-mode multi-core optical transmission system

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OPTICS COMMUNICATIONS 2016年 371卷 238-242页

作者： Pan, Xiaolong Liu, Bo Li, Li Tian, Qinghua BUPT State Key Lab Informat Photon & Opt Commun Beijing 100876 Peoples R China BUPT Sch Elect Engn Beijing 100876 Peoples R China BUPT Sch Sci Beijing 100876 Peoples R China

This paper proposes and demonstrates a low complexity multiple-input multiple-output (MIMO) equalization digital signal processing (DSP) method for the few mode multi-core (FMMC) fiber optical transmission system. The MIMO equalization algorithm offers adaptive equalization taps according to the degree of crosstalk in cores or modes, which eliminates the interference among different modes and cores in space division multiplexing (SDM) transmission system. Compared with traditional MIMO method, the proposed scheme has increased the convergence rate by 4 times and reduced the number of finite impulse response (FIR) filters by 55% when the numbers of mode and core are three. (C) 2016 The Authors. Published by Elsevier B.V.

关键词： multiple-input multiple-output Few mode multi-core Space division multiplexing

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Low-complexity soft-decision aided detectors for coded spatial modulation MIMO systems

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EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING 2016年第1期000卷 1-11页

作者： Li, Cong Wang, Jinlong Cheng, Yunpeng Huang, Yuzhen PLA Univ Sci & Technol Coll Commun Engn Nanjing Jiangsu Peoples R China

In this paper, we present an efficient transmission scheme for multiple-input multiple-output (MIMO) systems, i.e., coded spatial modulation (SM) systems with soft-decision aided detector. To exploit the powerful error correction of channel coding, the key challenge of coded SM systems is on designing a reliable but low-complexity soft-output detector. Fighting against this problem, we first propose two soft-output detection algorithms by exploiting the features of M-phase-shift keying (PSK) and M-quadrature amplitude modulation (QAM) constellations, namely, PSK-based soft-output detector (PBSD) and QAM-based soft-output detector (QBSD). Furthermore, to further enhance the performance of the two algorithms, we propose another two soft-output detection algorithms taking into account of counterpart maximum-likelihood (ML) estimate, namely, improved PSK-based soft-output detector (IPBSD) and improved QAM-based soft-output detector (IQBSD). The findings of this paper demonstrate that: (1) The computational complexity of PBSD and QBSD algorithms are much lower than that of Max-Log-LLR algorithm at the expense of error performance. (2) Both the IPBSD and IQBSD algorithms achieve the same performance as Max-Log-LLR algorithm with reduced computational complexity. In addition, a comprehensive performance and computational complexity comparison between the proposed algorithms and the Max-Log-LLR algorithm is provided to verify our proposed low-complexity soft-output detectors.

关键词： Spatial modulation multiple-input multiple-output Maximum a posteriori probability Max-Log-LLR detector

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Feasibility of Interference Alignment for MIMO Two-Way Interference Channel

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IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2016年第2期E99A卷 651-655页

作者： Kim, Kiyeon Yang, Janghoon Kim, Dong Ku Yonsei Univ Sch Elect & Elect Engn 50 Yonsei Ro Seoul 120749 South Korea Korean German Inst Technol Fac Dept Newmedia 99Hwagok Ro 61 Gil Seoul South Korea

The feasibility condition of interference alignment (IA) for multiple-input multiple-output two-way interference channel is studied in this paper. A necessary condition and a sufficient condition on the IA feasibility are established and the sum degrees of freedom (DoF) for a broad class of network topologies is characterized. The numerical results demonstrate that two-way operation with appropriate IA is able to achieve larger sum DoF than the conventional one-way operation.

关键词： degrees of freedom full-duplex interference alignment multiple-input multiple-output

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MIMO PCB-INTEGRATED SLOT ANTENNA FOR IEEE 802.11n WLAN ACCESS-POINT APPLICATIONS

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2016年第5期58卷 1254-1256页

作者： Lin, Chun-Cheng Huang, Chih-Yu ROC Air Force Acad Dept Math & Phys Sci Kaohsiung 820 Taiwan Natl Kaohsiung Normal Univ Dept Elect Engn Kaohsiung 802 Taiwan

A multiple-input multiple-output (MIMO) slot antenna integrated with a printed circuit board (PCB) is proposed for accesspoint (AP) applications. The antenna comprises two square slot radiators fed by mutually orthogonal 50-X microstrip lines. Through an appropriate adjustment of the antenna geometry parameters, a sufficient 210 dB return loss impedance bandwidth (similar to 21% at 2.43 GHz), a good radiating performance (i.e., high antenna peak gain values and stable radiation patterns), and a high isolation between the radiators can be achieved. The antenna is thus ideally suited for IEEE 802.11n (2.4 GHz) wireless local area network (WLAN) AP applications. (C) 2016 Wiley Periodicals, Inc.

关键词： access-point multiple-input multiple-output printed circuit board slot antenna wireless local area network

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Sum-rate maximisation for two-way AF MIMO relaying networks and random antenna selection

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International Journal of Communication Networks and Distributed Systems 2016年第1期16卷 16-28页

作者： Sayeb, Rahima Hamdi, Noureddine Manar Univ ENIT Commun Syst Lab BP 37 Tunis 1002 Tunisia Carthage Univ INSAT Dept Comp Sci & Math Ctr Urbain Nord BP 676 Tunis 1080 Tunisia

This paper considers a multiple-input multiple-output (MIMO) two-way relaying network, where two-source nodes exchange data via a half-duplex amplify-and-forward (AF) relay. In this paper, we propose an efficient random antenna selection strategy based on maximising the sum-rate and minimising the power consumption. The proposed strategy involves choosing the best transmit and receive antennas at the two sources based on the maximisation of the overall sum-rate. The key design criterion is to reduce transmit radio frequency chains in order to minimise the energy consumption of the system. In the first step, transmit and receive antennas will be selected randomly. In the second step, signal-to-noise ratios (SNRs) of randomly chosen antennas are compared with a predefined threshold gamma th. If the SNRs of the selected antennas are higher than the predefined threshold, these antennas will be chosen for the communication. Else another random selection is used. Also, we show that for the problem of sum-rate maximisation related to the introduced system, the optimal relay matrix have a general beamforming structure. Simulations demonstrate the performance of the proposed algorithm.

关键词： multiple-input multiple-output MIMO cooperation AF model two-way relaying TWR sum-rate maximisation

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