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Impact Load Compensation Inverter Based on Nonlinear Adaptive multiple input multiple output Control Strategy

APPLIED SCIENCES-BASEL 2025年第6期15卷 3167-3167页

作者： Wang, Shuai Zhao, Ke Duan, Jiandong Sun, Li Harbin Inst Technol Sch Elect Engn & Automat Harbin 150001 Peoples R China

A nonlinear adaptive multiple-input multiple-output (NAMIMO) controller is designed to control a super capacitor compensation inverter. The proposed controller effectively suppresses the effects of impact loads from natural gas generation systems. In this paper, the transient current model of the compensation system is transformed into the power model using transient power theory, and then a direct power control algorithm with a vector control strategy is designed based on the whole power model. The proposed strategy can not only effectively suppress the impact of impact loads on the system but also maintain the stability of the microgrid to a certain extent. Meanwhile, the PLL control structure is replaced by an adaptive algorithm, which not only solves the system instability problem but also improves the dynamic response of the compensation system. In addition, the functional advantages, the frequency is bounded and stable throughout the whole process, and this differential frequency modulation allows the compensation system to exit the compensation smoothly. Finally, the simulation and experimental results on a 600 kW natural gas generator demonstrate that the proposed compensation strategy and control algorithm can effectively suppress the impact load effects.

关键词： multiple-input multiple-output super capacitor impact load natural gas generator inverter

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multiple-input multiple-output synthetic aperture radar antenna arrangement for wide-swath remote sensing

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JOURNAL OF APPLIED REMOTE SENSING 2015年第1期9卷 094097-1-094097-18页

作者： Shao, Huaizong Wang, Wen-Qin Univ Elect Sci & Technol China Sch Commun & Informat Engn High Tech Sect Chengdu 611731 Peoples R China

Simultaneous high-resolution and wide-swath (HRWS) remote sensing imaging is of great importance in future microwave remote sensing, but it is limited by the minimum antenna area constraint. multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) offers new opportunities due to its increased degrees of freedom and system flexibility. We investigate four elevation MIMO SAR antenna arrangements, namely narrow-beam transmission narrow-beam reception, narrow-beam transmission wide-beam reception, wide-beam transmission narrow-beam reception, and wide-beam transmission wide-beam reception (WTWR) in HRWS remote sensing. Their signal models, system gains and range ambiguity-to-signal ratio performances are comparatively investigated. Three waveforms that have a large time-bandwidth product and constant modulus are designed for the MIMO SAR system and the impacts of their mutual interferences due to imperfect waveform orthogonality are also simulated. Simulation results show that MIMO SAR is superior to conventional single-antenna SAR and existing multichannel SAR techniques in wide-swath remote sensing. (C) 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： multiple-input multiple-output wide-swath high-resolution wide-swath high-resolution synthetic aperture radar (SAR) multichannel SAR waveform diversity

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multiple-input multiple-output Radar Waveform Design Methodologies

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DEFENCE SCIENCE JOURNAL 2013年第4期63卷 393-401页

作者： Merline, A. Thiruvengadam, S. J. Sethu Inst Technol Kariapatti 626115 India Thiagarajar Coll Engn Madurai 625015 Tamil Nadu India

multiple-input multiple-output (MIMO) radar is currently an active area of research. The MIMO techniques have been well studied for communications applications where they offer benefits in multipath fading environments. Partly inspired by these benefits, MIMO techniques are applied to radar and they offer a number of advantages such as improved resolution and sensitivity. It allows the use of transmitting multiple simultaneous waveforms from different phase centers. The employed radar waveform plays a key role in determining the accuracy, resolution, and ambiguity in performing tasks such as determining the target range, velocity, shape, and so on. The excellent performance promised by MEMO radar can be unleashed only by proper waveform design. In this article, a survey on MIMO radar waveform design is presented. The goal of this paper is to elucidate the key concepts of waveform design to encourage further research on this emerging technology.

关键词： multiple-input multiple-output MIMO systems radars

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Distributed Interference Alignment Algorithm for multiple-input multiple-output Networks with Uncoordinated Interference

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COGNITIVE COMPUTATION 2013年第2期5卷 215-224页

作者： Zhong, Liang Zhu, Guangxi Kong, Zhengmin Liu, Jian Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Natl Engn Lab Next Generat Internet Access Syst Dept Elect & Informat Engn Wuhan 430074 Peoples R China Wuhan Univ Dept Automat Wuhan 430072 Peoples R China

This paper introduces a novel two-step interference alignment beamforming algorithm for a multiple-antenna interference channel with uncoordinated interference. The proposed algorithm performs subspace division of the signal space by using the total least squares method to use all available degrees of freedom in the system. The algorithm also uses the minimum mean square error as a criterion to maximize the sum rate of the system. Simulation results indicate that the sum rate of the proposed algorithm outperforms the sum rates of previous works in the context of a network with uncoordinated interference. The performance levels of these algorithms are also compared for different uncoordinated interference strengths. Almost the same trend is obtained for the sum rate performance.

关键词： multiple-input multiple-output Interference alignment Total least squares Minimum mean square error

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Perfect orthogonal waveform scheme used for high-resolution multiple-input multiple-output synthetic aperture radar system

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JOURNAL OF APPLIED REMOTE SENSING 2016年第3期10卷

作者： Li, Shufeng Jin, Libiao Commun Univ China Sch Informat & Engn Dingfuzhuang East St 1 Beijing 100024 Peoples R China

We investigate multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) scheme with an ultra-low side-lobe ratio performance for using complete complementary sequences (CCS) waveform. It is shown that the CCS can be applied in a MIMO SAR system to obtain high resolution in range direction. In addition, the azimuth channel scheme with the multiple subsequences of CCS is also considered. First, we introduce the concept of CCS and establish the transmitter model based on CCS in MIMO SAR system. Then, we propose the corresponding imaging algorithm for employing the CCS to accurately focus the raw data of the MIMO SAR system and derive the range cell migration correction. Considering the signal complexity, we make use of the CCS pairs to analyze the MIMO SAR imaging algorithm. Finally, simulation results demonstrate the validity and feasibility of the proposed MIMO SAR scheme and the potential advantage of CCS. (C) 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)

关键词： multiple-input multiple-output imaging algorithm complete complementary sequence

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Data throughputs using, multiple-input multiple-output (MIMO), techniques in a noise-limited cellular environment

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2002年第2期1卷 226-235页

作者： Catreux, S Driessen, PF Greenstein, LJ Iospan Wireless San Jose CA 95131 USA Univ Victoria Victoria BC V8W 5C3 Canada AT&T Labs Res Middletown NJ 07748 USA

We present a general framework to quantify the data throughput capabilities of a wireless communication system when it combines: 1) multiple transmit signals;2) adaptive modulation for each signal;and 3) adaptive array processing at the receiver. We assume a noise-limited environment, corresponding to either an isolated cell or a multicell system whose out-of-cell interference is small compared with the thermal noise. We focus on the user data throughput, in bits per second/Hertz (bps/Hz), and its average over multipath fading, which we call the user spectral efficiency. First, an analysis method is developed to find the probability distribution and mean value of the spectral efficiency over the user positions and shadow fadings, both as. a function of user distance from its serving base station and averaged over the cell coverage area. We assume fading conditions and receiver processing that lend themselves to closed-form analysis. The resulting formulas are simple and straightforward to compute, and they provide a number of valuable insights. Next, we run Monte Carlo simulations, both to confirm the analysis and to treat cases less amenable to simple analysis. A key contribution of this paper is a simple formula for the mean spectral efficiency in terms of the propagation exponent, mean signal-to-noise ratio at the cell boundary, number of antennas, and type of coding. Under typical propagation conditions, the mean spectral efficiency using three transmit and three receive antennas ranges from 19.2 bps/Hz (uncoded) to 26.8 bps/Hz (ideally coded), highlighting the potential benefits of multiple transmissions combined with adaptive techniques. This is much higher than the spectral efficiencies for a link using a single transmitter and a threefold receive diversity under the same conditions, where the range is from 8.77 bps/Hz to 11.4 bps/Hz. Moreover, the latter results are not nearly as practical to achieve, as they call for large signal constellations that would b

关键词： adaptive modulation antenna arrays fading channels land mobile radio cellular systems multiple-input multiple-output

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Radio Vortex multiple-input multiple-output Communication Systems With High Capacity

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IEEE ACCESS 2015年 3卷 2456-2464页

作者： Zhu, Qibiao Jiang, Tao Qu, Daiming Chen, Da Zhou, Nanrun Huazhong Univ Sci & Technol Sch Elect Informat & Commun Wuhan 430074 Peoples R China Nanchang Univ Sch Informat Engn Nanchang 330031 Peoples R China

As a potential technique to improve channel capacity, orbital angular momentum has been developed in the radio field. In this paper, a novel radio vortex multiple-input multiple-output (RV-MIMO) system is proposed to provide high capacity in free space. In particular, the vortex channel of the proposed system is modeled. Based on this model, the optimal vortex phase is derived, which results in the optimal capacity of the proposed RV-MIMO system. Simulation results show that the proposed RV-MIMO system could achieve higher capacity than the MIMO system in free space.

关键词： Orbital angular momentum radio vortex multiple-input multiple-output vortex phase

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Blind channel estimation for multiple-input multiple-output system using Constant Modulus Algorithm

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COMPUTERS & ELECTRICAL ENGINEERING 2015年 44卷 42-50页

作者： Kanmani, M. Kannan, M. Anna Univ Dept ECE Jerusalem Coll Engn Madras 600025 Tamil Nadu India Anna Univ Dept Elect Engn Madras Inst Technol Madras 600025 Tamil Nadu India

multiple-input multiple-output system plays a major role in the fourth generation wireless systems to provide high data rates. In this paper, a blind channel estimation approach has been proposed for finding the channel length based on the signals received from the MIMO (multiple-input multiple-output) transceiver. The resultant MIMO channel length information is utilized for estimation of the channel impulse response of the system. The estimation is used for adaptation of the equalizer weights, based on the proposed Constant Modulus Algorithm which has reduced the fading and multipath propagation resulting from Inter Symbol Interference. The performance of the proposed system has been analyzed in terms of Mean Square Error and Symbol Error Rate for various Signal to Noise Ratio. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： multiple-input multiple-output Channel length estimation Constant Modulus Algorithm Blind equalization Inter Symbol Interference

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Throughput Performance of Wireless multiple-input multiple-output Systems Using OAM Antennas

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IEEE WIRELESS COMMUNICATIONS LETTERS 2021年第2期10卷 261-265页

作者： Lei, Yi Yang, Yang Wang, Yanzhe Guo, Kai Gong, Yubin Guo, Zhongyi Hefei Univ Technol Sch Comp & Informat Hefei 230009 Peoples R China Univ Elect Sci & Technol China Natl Key Lab Vacuum Elect Chengdu 610054 Peoples R China

This letter experimentally demonstrated the performance improvement of orbital-angular-momentum (OAM) based 2 x 2 MIMO communication by using the diversity of different OAM modes. The OAM antenna we used is an eight-arm Archimedean spiral antenna (ASA) capable of generating multiple high-quality OAM vortex waves individually or two types of two-mode mixed vortex waves simultaneously. Both of the two cases are investigated for MIMO communication by evaluating the throughput performance. For MIMO with two OAM modes (generated by two ASAs separately), the throughput improves upon traditional MIMO by up to 30.50%, while for MIMO with two-mode mixed vortex waves (generated by one ASA), 6.59% throughput improvement is obtained.

关键词： MIMO communication Wireless communication Receiving antennas Throughput Spirals Wireless fidelity Orbital angular momentum archimedean spiral antenna multiple-input multiple-output wireless communications

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Channel estimation of pulse-shaped multiple-input multiple-output orthogonal frequency division multiplexing systems

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IET COMMUNICATIONS 2010年第17期4卷 2104-2114页

作者： Wan, F. Zhu, W. -P. Swamy, M. N. S. Univ So Calif Ming Hsieh Dept Elect Engn Los Angeles CA 90089 USA Concordia Univ Dept Elect & Comp Engn Ctr Signal Proc & Commun Montreal PQ H3G 1M8 Canada

Most of the existing multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) channel estimation methods do not take into account the effect of the pulse-shaping filter in the transmitter nor of the matched filter in the receiver, thus leading to an estimation solution for the composite channel including the pulse-shaping and matched filters, instead of the pure wireless channel. This solution is not sufficiently accurate because of the extra length of the composite channel induced by the two filters especially in the scenario with a small pure channel length. In this study, the authors present a novel methodology for the estimation of the pure multipath channels of pulse-shaped MIMO-OFDM systems. By utilising the knowledge of pulse-shaping and matched filters, the authors develop two channel estimation approaches, namely, a semi-blind approach for the sampling duration-based channels, in which the multipath occurs at the sampling instant and a training-based least-square technique for the upsampling duration-based channels where the multipath may occur in a fraction of sampling duration. A number of computer simulation-based experiments are conducted, and these simulation results confirm the efficacy of the proposed approaches.

关键词： MIMO-OFDM pulse-shaping Interpolation and function approximation (numerical analysis) Modulation and coding methods Radio links and equipment least squares approximations matched filter upsampling duration-based channels semi-blind approach Communication channel equalisation and identification OFDM modulation matched filters channel estimation estimation solution multiple-input multiple-output pulse-shaped MIMO orthogonal frequency division multiplexing systems least-square technique MIMO communication

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