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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Salem, Abdelhamid Masouros, Christos UCL Dept Elect & Elect Engn London England

ISBN: (纸本)9781538676462

This paper analyzes the performance of multi-user multiple-input multiple-output (MU-MIMO) systems, with a finite phase-shift keying (PSK) input alphabet. The achievable sum rate is investigated for two precoding techniques, namely: 1) zero forcing (ZF) precoding, 2) constructive interference (CI) precoding. In light of this, new analytical expressions for the average sum rate are derived in the two scenarios, and Monte Carlo simulations are provided throughout to confirm the analysis. Furthermore, based on the derived expressions, a power allocation scheme that can ensure fairness among the users is also investigated. The results in this paper demonstrate that, the CI strictly outperforms the ZF scheme, and the performance gap between the considered schemes depends essentially on the system parameters.

关键词： Finite constellation signaling zero forcing constructive interference multiple-input multiple-output

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Portable Doppler/FSK/FMCW Radar Systems for Life Activity Sensing and Human Localization 14

Portable Doppler/FSK/FMCW Radar Systems for Life Activity Se...

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14th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)

作者： Li, Changzhi Wang, Jing Rodriguez, Daniel Mishra, Ashish Peng, Zhengyu Li, Yiran Texas Tech Univ Elect & Comp Engn Dept Lubbock TX 79409 USA

ISBN: (纸本)9781728108780

This paper presents recent progress on portable Doppler, frequency-shift keying (FSK) and frequency-modulated continuous-wave (FMCW) radar systems for life activity sensing and human localization. It starts from a software-based calibration technology that significantly improves the accuracy and reliability of millimeter-wave interferometry radar front-end for physiological motion and vocal vibration detection. Then, the operation principle and unique features of FSK and FMCW radar, such as RF/digital beamforming, for human-aware sensing and localization will be presented. To reject clutter noise, which is a common challenge for practical deployment of short-range radar system, intermodulation radar technique will be discussed. Then, machine learning will be presented as an efficient approach to make the radar system smart for automatic classification and decision making. Finally, challenges for biomedical radar systems and future development directions will be discussed.

关键词： Biomedical Radar Doppler FSK FMCW multiple-input multiple-output Millimeter-wave Beamforming

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Modified Independent Modal Space Control for Large-Flexible Asymmetrical Resonant Structures 10

Modified Independent Modal Space Control for Large-Flexible ...

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10th IEEE International Conference on Mechanical and Aerospace Engineering (ICMAE)

作者： Zhang, Peng He, Fangpo Flinders Univ S Australia Adv Control Syst Res Grp Adelaide SA Australia

ISBN: (纸本)9781728155357

This paper presents the design and implementation of a Modified Independent Modal Space Control (MIMSC) method for vibration suppression of multiple-input multiple-output asymmetrical resonant structures. The proposed method offers several important features over its classical counterpart. It can control any number of modes with a fixed number of sensors and actuators, reduces the computation load involved with the classical method, and provides flexible configurations to arrange the required input/output signals for controlling individual modes. Using a unique model module, the proposed method is potentially applicable to large-scale systems with distinctive vibration characteristics. The effectiveness of the proposed MIMSC method is validated via simulation and experimental studies on a given one-plane asymmetrical plate structure.

关键词： modified independent modal space control multiple-input multiple-output asymmetrical resonant structures vibration suppression

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A tri-band notched Ultra-wideband MIMO Antenna

A tri-band notched Ultra-wideband MIMO Antenna

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International Symposium on Antennas and Propagation (ISAP)

作者： Zhang, Yu Jiao, Yong-Chang Yang, Mi-Mi Zhao, Bao-Li Xidian Univ Natl Key Lab Antennas & Microwave Technol Xian 710071 Peoples R China

ISBN: (纸本)9787900914040

In this letter, a compact ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna with a high isolation covering 3.1-10.6 GHz UWB bands is presented. The proposed antenna is based on planar monopoles, and three band rejections are achieved by adding three Archimedes spiral electromagnetic band gap (As-EBG) structures. Isolation between two radiators is improved by suppressing the surface current flow through the T-shaped strip and triangular slot on the ground plane. The proposed antenna has a low mutual coupling of less than -20 dB over the target band (3.1-10.6 GHz). Therefore, the proposed antenna is a good candidate for UWB MIMO portable applications.

关键词： Ultra-wideband multiple-input multiple-output AS-EBG

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Outage Performance of NOMA with Majority Based TAS/MRC Scheme in Rayleigh Fading Channels 27

Outage Performance of NOMA with Majority Based TAS/MRC Schem...

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27th Signal Processing and Communications Applications Conference (SIU)

作者： Aldababsa, Mahmoud Kucur, Oguz Gebze Tech Univ Elect Engn Gebze Turkey

ISBN: (纸本)9781728119045

In this paper, we propose a new suboptimal antenna selection (AS) algorithm, majority based transmit antenna selection (TAS-maj), to maximize the system performance of the non-orthogonal multiple access (NOMA). The TAS-maj scheme chooses the transmit antenna with the majority. It has remarkable advantages over previously proposed AS algorithms It has lower computational complexity than optimal AS scheme. Also, it provides better performance than the suboptimal AS algorithms, max-max-max (A(3)) and max-min-max (AIA), since these algorithms aim to maximize the performance of the strong and weak users, respectively. On the other hand, the TAS-maj scheme aims to optimize the performance of more than half of the mobile users in the NOMA network. In this paper, multiple-input multiple-output communication system is considered, in which all the nodes are equipped with multi-antenna. The diversity schemes TAS-maj and maximal ratio combining (MRC) are employed at the base station and mobile users, respectively. Meanwhile, the expression of the signal-to-interference-and-noise is derived. Then, the outage behavior of the NOMA with the TAS-maj/MRC scheme is investigated over Rayleigh fading channels by the Monte Carlo simulations.

关键词： Non-orthogonal multiple access multiple-input multiple-output Transmit antenna selection Maximal ratio combining Majority Rayleigh Monte Carlo simulation

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Discrete Cuckoo Search Algorithm for MIMO Detection 34

Discrete Cuckoo Search Algorithm for MIMO Detection

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34th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC)

作者： Jung, Donghyeok Eom, Chahyeon Lee, Chungyong Yonsei Univ Dept Elect & Elect Engn Seoul South Korea

ISBN: (纸本)9781728132716

This paper proposes a discrete cuckoo search algorithm, which is a meta-heuristic optimization algorithm used to solve real-world problems, and it is applied to the multiple-input and multiple-output symbol detection problem. However, simply applying the cuckoo search algorithm is problematic since it does not consider the convex and discrete nature of the symbol detection problem. Thus, a discrete cuckoo search algorithm is applied to the decoded process to enhance the error performance of symbol detection

关键词： multiple-input multiple-output cuckoo search algorithm discrete cuckoo search algorithm

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Amplitude-phase precoding scheme for high speed ROF-MIMO systems 11

Amplitude-phase precoding scheme for high speed ROF-MIMO sys...

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11th International Conference on Information Optics and Photonics (CIOP)

作者： Li, Rui Zhang, Qi Xin, Xiangjun Tian, Feng Liu, Naijin Tian, Qinghua Zhang, Wei Lin, Ming Wang, Yang Wang, Yongjun Beijing Univ Posts & Telecommun Xitucheng Rd 10 Beijing 100876 Peoples R China Key Lab Space Ground Interconnect & Convergence Xitucheng Rd 10 Beijing 100876 Peoples R China China Acad Space Technol Friendship Rd 104 Beijing 100094 Peoples R China Guangdong Univ Technol Waihuan West Rd 100 Guangzhou 510006 Guangdong Peoples R China China Elect Power Res Inst Co Ltd Qinghexiaoying East Rd 15 Beijing 100192 Peoples R China

ISBN: (数字)9781510631748

ISBN: (纸本)9781510631748

An amplitude-phase precode method that based on a high speed ROF-MIMO system is proposed to solve the distortion problem due to the features of optical devices and link damages. This method uses the digital predistortion algorithm model,which is based on Weierstrass theorem. This could precompensation to the ROF links and reduce the influence of nonlinear characteristics of optical devices such as erbium-doped fiber amplifiers on system signal transmission, and solve the sensitivity of QAM, OFDM and other non-constant envelope modulation signals to system distortion. Then the Minimum Mean Square Error (MMSE) precoding method is used to optimize the spatial characteristics of the MIMO transmission signal to solve the signal interference problem, so as to reduce the bit error rate of the system and reduce the complexity of digital signal processing at the user terminal. The simulation results show that the bit error rate (BER) performance of ROF system with the proposed amplitude-phase precode method is lower than 4*10-4 during the transmitting 10 Gb/s 16QAM-OFDM signal in 20km standard single model fiber. The proposed scheme has the obvious lower bit error rate than the non-precode high speed ROF-MIMO system. Therefore, the proposed scheme improves the base station and antenna array coverage, at same time, reduce the complexity of terminal unit and increase the stability of the system transmission.

关键词： Radio-Over-Fiber Precoding multiple-input multiple-output MMSE OFDM 16QAM

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Efficient Detection for Improving ASEP Performance of MIMO Composite Fading Channel with Generalized Noise

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WIRELESS PERSONAL COMMUNICATIONS 2018年第3期98卷 2913-2923页

作者： Tiwari, Keerti Saini, Davinder S. Bhooshan, Sunil V. Jaypee Univ Informat Technol Dept Elect & Commun Engn Solan 173234 HP India Chandigarh Coll Engn & Technol Dept Elect & Commun Engn Chandigarh 160019 India

multiple-input multiple-output (MIMO) system has achieved significant benefits by applying optimum detection techniques. Maximum likelihood (ML) detection technique improves the error rate performance of MIMO system at optimum level but with enhanced complexity. Therefore, we have considered minimum mean square error-ordered successive interference cancellation with candidate detection to approach the performance of ML with reduced complexity. The proposed system performance is analyzed in composite Weibull-gamma fading and additive white generalized Gaussian noise (AWGGN) scenario. Some special cases of WG fading and AWGGN yield the simplified results.

关键词： multiple-input multiple-output Maximum likelihood Minimum mean square error-ordered successive interference cancellation with candidate Additive white generalized Gaussian noise

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Spatial multiplexing for Photon-Counting MIMO-FSO Communication Systems

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2018年第9期17卷 5789-5803页

作者： Abou-Rjeily, Chadi Lebanese Amer Univ Dept Elect & Comp Engn Byblos 961 Lebanon

In this paper, we consider the problem of multiple-input multiple-output (MIMO) free-space optical communications under the Poisson photon-counting detection model. Aiming for high bit rate objectives, we consider the spatial-multiplexing (SMux) solution with M-ary pulse-position modulation, where we propose appropriate optimal and suboptimal decoders and evaluate their complexities. Such novel decoder designs are needed, since the widely spread Gaussian noise-based MIMO decoders are not suitable for the Poisson model. We also carry out an asymptotic performance analysis. This analysis guides a candidate constellation confinement where transmissions are limited to some selected information vectors of the multi-dimensional SMux constellation. This confinement meets the objective of compromising the multiplexing gains for the sake of improved error-rates. The analyzed SMux solutions with both the unconfined and confined constellations transmit at higher data rates compared with the existing single-aperture systems, MIMO systems with repetition coding, and MIMO systems based on spatial modulation.

关键词： Free-space optics FSO multiple-input multiple-output MIMO maximum-likelihood spatial multiplexing Poisson noise suboptimal decoders constellation confinement performance analysis

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Performance analysis of zero-forcing precoding with signal space diversity under antenna correlation

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PHYSICAL COMMUNICATION 2018年 30卷 115-121页

作者： Ozyurt, Serdar Ankara Yildirim Beyazit Univ Fac Engn & Nat Sci Ankara Turkey

We consider a multiantenna transmission system where the transmitter and receiver respectively have M and two antennas. Specifically, zero-forcing precoding is employed at the transmitter based on a possibly imperfect channel state information (CSI). The channel estimation is carried out at the transmitter using pilot signals sent from the receiver. Adopting a dual-stream transmission structure, the error performance of the system is enhanced by resorting to signal space diversity (SSD). The performance of the proposed system with binary phase shift keying modulation is studied under a slow flat Rayleigh fading scenario with uncorrelated transmit antennas and correlated receive antennas. We separately examine two cases: the perfect CSI and imperfect CSI at the transmitter. In the former scenario, we provide an exact closed-form expression on the bit error probability (BEP) of the proposed approach. A tight approximation on the BEP of the proposed scheme is presented for the latter scenario. The case with distinct channel estimation qualities for the two subchannels is also considered in the second scenario. The proper rotation angles for the BPSK signal constellation are analytically obtained such that the derived expressions on the BEP are minimized under both cases. We show that the inclusion of SSD into the original scheme yields a noteworthy improvement on the BEP performance with only an insignificant increase in complexity and no additional use of bandwidth/time slots. It is also shown that the proposed technique is more immune against the channel estimation errors as compared to the original method. (C) 2018 Elsevier B.V. All rights reserved.

关键词： multiple-input multiple-output Zero-forcing precoding Signal space diversity Rayleigh fading Channel state information Antenna correlation Channel estimation errors

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