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Compact Slot Antenna for Mimo Applications in the Wlan Bands

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2013年第10期55卷 2490-2493页

作者： Naser-Moghadasi, M. Danideh, A. Bakhtiari, A. Sadeghifakhr, R. Islamic Azad Univ Sci & Res Branch Dept Elect Engn Tehran Iran

A rectangular slot antenna fed by a coplanar waveguide is proposed for dual-band wireless local area network (WLAN) operations. The measured 210-dB bandwidth for return loss is from 2.1 to 2.95 GHz and 5.05 to 6.25 GHz, covering all the 2.4/5-GHz WLAN bands. A multifeed four-element planar array was designed and simulated. It shows that the features of small size, uniplanar structure, good radiation characteristics, and small mutual coupling are promising for multi-input multi-output applications. (c) 2013 Wiley Periodicals, Inc.

关键词： slot antenna dual-band operation coplanar waveguide-fed wireless local area network multi-input multi-output

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A 2 x 2 imaging MIMO system based on LED Visible Light Communications employing space balanced coding and integrated PIN array reception

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OPTICS COMMUNICATIONS 2016年 367卷 214-218页

作者： Li, Jiehui Xu, Yinfan Shi, Jianyang Wang, Yuanquan Ji, Xinming Ou, Haiyan Chi, Nan Fudan Univ Dept Commun Sci & Engn Key Lab Electromagnet Wave Informat Sci Shanghai 200433 Peoples R China Fudan Univ Dept Microelect State Key Lab ASIC & Syst Shanghai 200433 Peoples R China Tech Univ Denmark DTU Foton Orsteds Plads 343 DK-2800 Lyngby Denmark

In this paper, we proposed a 2 x 2 imaging multi-input multi-output (MIMO)-Visible Light Communication (VLC) system by employing Space Balanced Coding (SBC) based on two RGB LEDs and integrated PIN array reception. We experimentally demonstrated 1.4-Gbit/s VLC transmission at a distance of 2.5 m. The proposed imaging system not only overcomes the limitation of bandwidth existing in LEDs, but also can reject the second-order nonlinearity distortion. It turned out to be very promising to use integrated antennas in the VLC system in the future. (C) 2016 Published by Elsevier B.V.

关键词： Space balanced coding PIN array RGB LED OFDM multi-input multi-output

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Inter-antenna and subblock shifting and inversion for peak-to-average power ratio reduction in MIMO-OFDM systems

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The Journal of China Universities of Posts and Telecommunications 2007年第4期14卷 41-45页

作者： WANG Yi TAO Xiao-feng Key Laboratory of Universal Wireless Communications (Beijing University ofPosts and Telecommunications) Ministry of Education Wireless TechnologyInnovation Institute Beijing 100876 China

In this article, an inter-antenna inter-subblock shifting and inversion （IASSI） scheme is proposed to reduce the peak-to-average power ratio （PAPR） in multi-input multioutput orthogonal frequency division multiplexing （MIMO- OFDM） systems. It exploits multiple antennas and subblocks to provide additional degrees of freedom to benefit the system. To reduce the implementation complexity of the proposed scheme, two simple suboptimal schemes are further presented based on the minimum current maximum criterion; one adopts sequential search and the other employs random binary grouping. The simulation results exhibit the effectiveness of these proposed schemes.

关键词： peak-to-average power ratio inter-antenna and subblock shifting and inversion sequential search randombinary grouping multi-input multi-output orthogonal frequencydivision multiplexing

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State-space model identification using input and output data with steady state values zeroing multiple integrals of output error

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JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME 2006年第3期128卷 746-749页

作者： Kosaka, Manabu Uda, Hiroshi Bamba, Eiichi Shibata, Hiroshi Kinki Univ Fac Sci & Engn Dept Mech Engn Higashiosaka Osaka 5778502 Japan Doshisha Univ Dept Mech Engn Kyoto 6100394 Japan

This study proposes a new deterministic off-line identification method that obtains a state-space model using input and output data with steady state values. This method comprises of two methods: Zeroing the 0 similar to N-tuple integral values of the output error of single-input single-output transfer function model (Kosaka et al., 2004) and Ho-Kalmans method (Zeiger and McEwen, 1974). Herein, we present a new method to derive a matrix similar to the Hankel matrix using multi-input and multi-output data with steady state values. State space matrices A, B, C, and D are derived from the matrix by the method shown in Zeiger and McEwen, 1974 and Longman and Juang, 1989. This method's utility is that the derived state-space model is emphasized in the low frequency range under certain conditions. Its salient feature is that this method can identify use of step responses;consequently, it is suitable for linear mechanical system identification in which noise and vibration are unacceptable. Numerical simulations of multi-input multi-output system identification are illustrated.

关键词： identification state-space model step response multi-input multi-output mechanical system

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A New Optimization Problem in FSO Communication System

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IEEE COMMUNICATIONS LETTERS 2018年第7期22卷 1442-1445页

作者： Amirabadi, Mohammad Ali Vakili, Vahid Tabataba Iran Univ Sci & Technol Sch Elect Engn Tehran *** Iran

According to the physical phenomena of atmospheric channels and wave propagation, the performance of wireless communication system can be optimized by simply adjusting its natural parameters. This way is economically more favorable than consuming more power or using additional processing techniques. In this letter for the first time, an optimization problem is developed on the performance of a free-space optical multi-input multi-output (FSO-MIMO) communication system. In addition, it is the first time that the optimization of the FSO system is developed under saturated atmospheric turbulence. In order to get closer to the actual results, the effect of pointing error is taken into considerations. Assuming multiple phase-shift keying and differential phase-shift keying modulation schemes, new closed-form expressions are derived for bit error rate (BER) and outage probability (P-out) of the proposed structure. Furthermore, an optimization problem is developed taking into account the equivalent beam waist as variable parameter, and BER as objective function, there is no constraint in this system. Obtained results can be a useful outcome for FSO-MIMO system designers in order to mitigate the effects of pointing error as well as atmospheric turbulence, and thus, achieve optimum performance.

关键词： Free space optical communication multi-input multi-output saturate atmospheric turbulence pointing error

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Channel-Adapted Spatial Modulation for Massive MIMO Visible Light Communications

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IEEE PHOTONICS TECHNOLOGY LETTERS 2016年第23期28卷 2693-2696页

作者： Xu, Ke Yu, Hongyi Zhu, Yi-Jun Natl Digital Switching Syst Engn & Technol Res Ct Zhengzhou 450000 Peoples R China

Massive multi-input multi-output (MIMO) has great potential to improve transmission rate of visible light communication (VLC) systems. However, high inter-channel interference (ICI) is the main factor that seriously influences the transmission performance. In this letter, with the channel state information (CSI) known at the transmitters, a general criterion of balancing the spectral efficiency and the error performance is established by analyzing the special features of MIMO-VLC. Based on the criterion, a channel-adapted spatial modulation (CASM) for massive MIMO-VLC is proposed, so as to find the optimal combinations of active light-emitting diodes under the controlled ICI. Simulation results show that CASM achieves more bit-error-rate gains over optical multi-stream spatial modulation (OMS-SM) with the same spectral efficiency, or even considering 10% reduction in the spectral efficiency of CASM caused by updating the CSI. Moreover, the higher spectral efficiency, the more gains of CASM over OMS-SM.

关键词： Visible light communication multi-input multi-output spatial modulation channel-adapted

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Adaptive neural dynamic surface control of MIMO nonlinear time delay systems with time-varying actuator failures

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INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING 2017年第2期31卷 275-296页

作者： Hashemi, Mahnaz Islamic Azad Univ Najafabad Branch Dept Elect Engn Najafabad Isfahan Iran

In this paper, an adaptive dynamic surface control approach is developed for a class of multi-input multi-output nonlinear systems with unknown nonlinearities, bounded time-varying state delays, and in the presence of time-varying actuator failures. The type of the considered actuator failure is that some unknown inputs may be stuck at some time-varying values where the values, times, and patterns of the failures are unknown. The considered actuator failure can cover most failures that may occur in actuators of the systems. With the help of neural networks to approximate the unknown nonlinear functions and combining the dynamic surface control approach with the backstepping design method, a novel control approach is constructed. The proposed design method does not require a priori knowledge of the bounds of the unknown time delays and actuator failures. The boundedness of all the closed-loop signals is guaranteed, and the tracking errors are proved to converge to a small neighborhood of the origin. The proposed approach is employed for a double inverted pendulums benchmark as well as a chemical reactor system. The simulation results show the effectiveness of the proposed method. Copyright (c) 2016 John Wiley & Sons, Ltd.

关键词： time-varying actuator failure time-varying delays multi-input multi-output nonlinear systems dynamic surface control adaptive compensation

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Efficient Transmission and Detection Based on RNS for Generalized Space Shift Keying

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IEEE WIRELESS COMMUNICATIONS LETTERS 2017年第4期6卷 486-489页

作者： Hai, Han Jiang, Xue-Qin Wen, Miaowen Lee, Moon Ho Jeong, Yongchae Chonbuk Natl Univ Div Elect & Informat Engn Jeonju 54896 South Korea Donghua Univ Sch Informat Sci & Technol Shanghai 201620 Peoples R China South China Univ Technol Sch Elect & Informat Engn Guangzhou 510640 Guangdong Peoples R China

We propose an efficient transmission scheme for the generalized space shift keying (GSSK) based on the residue number system (RNS). The proposed scheme increases the number of active transmit antenna combinations (TACs), resulting in a higher throughput than that of the conventional GSSK systems. The received signals can be detected by a joint maximum likelihood (ML) detection, whose complexity, however, grows exponentially with the number of active TACs. To solve this problem, we propose a new detection method based on the RNS, whose complexity is much lower than that of the joint ML detection with negligible performance loss.

关键词： multi-input multi-output generalized space shift keying residue number system maximum likelihood detection mixed radix conversion

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On the Relationship Between MIMO and SIMO Radars

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2009年第1期57卷 394-398页

作者： Friedlander, Benjamin Univ Calif Santa Cruz Dept Elect Engn Santa Cruz CA 95064 USA

This correspondence explores the close relationship between multiple-input multiple-output (MIMO), single-input multiple-output (SIMO), and phased-array radars. It is shown that under certain conditions, the signals received by a MIMO radar and by a properly defined SIMO radar are identical. Several equivalent variations of MIMO and SIMO radars are presented. These relationships make it possible to study MIMO radars in terms of their equivalent SIMO radars, using the extensive body of algorithms and performance analysis which have been developed for SIMO radars.

关键词： Antennas array manifold beamforming matched filter multi-input multi-output phased-array radar

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EXTENSIBLE COMPACT 8-PORT MIMO ANTENNA WITH PATTERN GAIN

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2017年第2期59卷 236-240页

作者： Lee, D. -J. Lee, S. -J. Khang, S. -T. Yu, J. -W. Korea Adv Inst Sci & Technol Dept Elect Engn 373-1 Guseong Dong Daejeon 305701 South Korea

A novel and compact 8-port multi-input multioutput (MIMO) antenna is presented, which uses pattern gain to achieve more than an ideal 6-port polarimetric antenna gain. Antenna elements types, geometry on the common ground and antenna elements rotation are optimized for the pattern gain. The antenna consists of four pairs of inverted-F antennas, quarter wavelength slot antennas, parasitic elements, and ground plane. For the orthogonality, the inverted-F antenna for electric dipole and slot antenna for magnetic dipole are selected as elements of radiator. Four pairs of the inverted-F antenna and slot antenna symmetrically stand on the ground and the antenna direction, location and the parasitic elements are studied for low mutual coupling and correlation. The proposed MIMO antenna shows isolation of better than 210 dB with an overall size of 0.5 lambda x 0.5 lambda x 0.13 lambda. The ergodic capacity of proposed antenna is presented to verify the MIMO antenna performance. The proposed 8-port MIMO antenna is extensible to 40-port antenna cube and its prototype is presented. (C) 2016 Wiley Periodicals, Inc.

关键词： compact antenna multi-input multi-output antenna system

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