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Deca-band structure reutilization MIMO antenna for 4G/5G full-screen metal frame smartphone operation

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING 2021年第12期31卷 e22890-e22890页

作者： Fang, Yixiang Liu, Ying Jia, Yongtao Liang, Junjie Xidian Univ Sch Elect Engn Natl Key Lab Antennas & Microwave Technol Xian 710071 Peoples R China

This article presents a deca-band multi-input multi-output (MIMO) antenna for full-screen metal frame smartphone, which covers wideband of GSM850, GSM900, DCS, PCS, UMTS, LTE2300, LTE2500, WLAN/WiMAX, N78, and sub-6 GHz (4.8-5.1 GHz) bands table. Two kinds of antenna structures are positioned on the long side edge and form two 2 x 2 MIMO array, covering the low-band (824-960 MHz) and mid-band (1710-2690 MHz/3300-3800 MHz), respectively. Four slot antennas are distributed on both sides of the short side edge. Each slot is connected to an antenna structure on the long side edge, sharing one port to form the high-band structure. By reutilization the low and mid-band structures, the high-band structure can achieved a wide band bandwidth without any additional matching structures. The high-band structure is composed of 4 x 4 MIMO array and covers the band of 4800-5825 MHz. A prototype of the proposed MIMO antenna is fabricated and measured. The isolation of the antenna is larger than 15 dB, the efficiencies are between 31% and 63%, and the ECCs is less than 0.3, which shows that the proposed antenna has great potential in the future 4G/5G smartphone application.

关键词： fifth-generation (5G) metal frame smartphone multi-input multi-output

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Design for vegetable waste fermentation control systems based on semi-tensor product fuzzy controller

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ADVANCES IN MECHANICAL ENGINEERING 2018年第8期10卷

作者： Wang, Zuoxun Wang, Guijuan Guo, Rongwei Qilu Univ Technol Shandong Acad Sci Sch Elect Engn & Automat Jinan 250353 Shandong Peoples R China Shandong Jianzhu Univ Sch Informat & Elect Engn Jinan Shandong Peoples R China

A multivariable fuzzy controller was designed to solve the control problem of vegetable waste fermentation. The knowledge-based fuzzy reasoning was constructed according to the sample data from both the fermentation process and the rule of temperature change in the control process. It is represented using the mathematical method of semi-tensor product matrices. The structural matrix of the fuzzy logic was constructed and the complex fuzzy reasoning was converted into simple matrix operations. In addition, a new algorithm based on the least in-degree method is put forward, solving the problem of control rules being incomplete and inconsistent. It was used for the design of the fuzzy controller on vegetable waste fermentation. The result of experiment proved that this control method is effective;the control method improves the adjustment speed as well as the control precision.

关键词： Fuzzy control semi-tensor product multi-input multi-output vegetable waste fermentation multi-sensor

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A novel dual-band-high-gain terahertz MIMO antenna

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MODERN PHYSICS LETTERS B 2024年第17期38卷

作者： Zhang, Rui Zhang, Yonggang Liang, Lanju Yao, Haiyun Yan, Xin Tian, Zhongjun Li, Zhenhua Wang, Ziqun Hu, Xiaofei Cao, Xin Yin, Kehao Liu, Wei Feng, Zhenwei Huang, Chengcheng Anhui Univ Sci & Technol Sch Elect & Informat Engn Huainan 232001 Anhui Peoples R China Zaozhuang Univ Sch Optoelect Engn Zaozhuang 277160 Peoples R China Zaozhuang Univ Sch Informat Sci & Engn Zaozhuang Peoples R China

In this study, a terahertz dual-band-high-gain, multi-input-multi-output (MIMO) antenna with two and four input ports was realized, with gain values of up to 7.16dBi and 6.44dBi, respectively. This represents an increase in gain of 102.4% and 81.8%, respectively, compared to single-input port antennas. By calculating and analyzing the voltage standing wave ratio (VSWR), gain, envelope correlation coefficient (ECC), and diversity gain, the two MIMO antennas achieved perfect impedance matching at their resonance points. Moreover, the interference between the elements of the MIMO antenna was small, and an isolation effect between the units was realized. These MIMO antennas can achieve multiple input signals to regulate the antenna radiation performance and improve signal strength and quality. In addition, they possess good development prospects for achieving high-speed data transmission in the terahertz band and in mobile communication.

关键词： multi-input multi-output voltage standing wave ratio envelope correlation coefficient directivity gain

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Suppressing the Noise in Measured Signals for the Control of Helicopters

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FLUCTUATION AND NOISE LETTERS 2019年第1期18卷

作者： Dube, Deepali Y. Patel, Hiren G. Sardar Vallabhbhai Natl Inst Technol Elect Engn Dept Surat 395007 Gujarat India

This paper concerns with the non-linear system having multiple-inputs multiple-outputs (MIMO). The plant mainly comprises: bench-top helicopter, tail and main rotor of a helicopter system. The dynamics are presented with control methodologies where a conventional strategy proves the instability of the system while the deadbeat and sliding mode control with linear matrix inequality regulates the future estimates. There have been disturbances like presence of unwanted ripples in the output of the non-linear systems (in case of stability also after 100 s) and in the tracking of states accurately by updating the minimization error regularly. These problems originate mainly from the rotor section and are visited carefully by studying the dynamics of the blade, whereas, the design of filter makes the solution more appealing. The adaptive filter is capable of handling the frequency spectra of noise (reducing noise by 10 dB), Euler angle deviations and travel angle accurately. Also, the stability analysis does not con firm the behavior in the case of bounded and a varying range of initial angular velocity. Hence, the problem of fluctuations is overcome by deadbeat and SMC-LMI approach which not only improved the ripples but also allowed the final response of the future states to be more exact and noiseless. As the previous research involved in position tracking (either translational or rotational) of these MIMO systems was concerned with software tools like MATLAB. This paper justifies its validation tested experimentally on OPAL RT hardware. The key findings involve the comparison of frequency spectra, the Euler deviation plot compared to CSL Helicopter and the three set-point variations providing accuracy in results in four modes - desired, actual, with controller-without filter and with controller-with filter. The use of adaptive filter with controllers have encouraged the suppression of noisy waveforms in the bench-top system very smoothly. The details regarding hardwar

关键词： Lagrange linear quadratic regulator linear matrix inequality multi-input multi-output sliding mode control

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multi-cell and multi-user Detection in Uplink for MIMO Systems

Multi-cell and Multi-user Detection in Uplink for MIMO Syste...

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2010 IEEE International Conference Conferenhce on Wireless Communications,Networking and Information Security(2010 IEEE 无线通信、网络技术与信息安全国际会议 WCNIS)

作者： Jinyuan Chen Jingyang Lu School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781424458509;9781424458493

In MIMO system, the inter-antenna interference and intra-cell interference are usually mitigated by local processing of own base station, however, inter-cell interference (ICI) is hard to be reduced effectively by the works of single cell. This paper proposes a multi-cell and multi-user detection algorithm to combat the ICI in uplink. The proposed algorithm can be implemented with the helps of multiuser detector and backhaul, as the former one is used to detect different signals from different cells and the latter one is used for sharing data information between neighboring cells. Simulation results show that the performances of proposed algorithm have great improvements in comparison to single-cell single-user detection, and have desirable gains comparing with single-cell multi-user detection.

关键词： multi-input multi-output probabilistic data association inter-cell interference multi-cell detection

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A Novel Intelligent Hyperball Fuzzy Agent for Intelligent Inhabited Environments

A Novel Intelligent Hyperball Fuzzy Agent for Intelligent In...

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第三十届中国控制会议

作者： LI Hui~1,DUAN Peiyong~2,DUAN Chenxu~2 1.Key Laboratory of Renewable Energy Utilization Technologies in Buildings,Ministry of Education Shandong Key Laboratory of Building Energy-saving Technique Jinan 250101,P.R.China 2.School of Information and Electrical Engineering,Shandong Jianzhu University,Jinan 250101,P.R.China

Generally,the occupants in a same inhabited environment may have different ***,the occupants' preferences change with varying space,time,etc,which desires that the intelligent agents have evolvement *** this paper,a novel intelligent hyperball fuzzy control agent is proposed,which is embedded in the inhabited environment where it learn the user behavior in a non intrusive mode and control the environment on the user behalf to realize the intelligent ambience. First,an improved FCM fuzzy cluster method is given to determine the number of fuzzy ***,the one-dimensional membership functions are replaced by the multi-dimensional membership ***,a fuzzy inference algorithm is presented to calculate the initial values of fuzzy rule *** proposed approaches can reduce the number of fuzzy rules and simplify the network ***,the fuzzy rules base can be modified online when the users' preferences changed. The simulation results demonstrated the effectiveness of the proposed approaches.

关键词： Intelligent Inhabited Environments Learning Agent Fuzzy multi-input multi-output

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Quantum Genetic Algorithm based Signal Detection Scheme for MIMO-OFDM System

Quantum Genetic Algorithm based Signal Detection Scheme for ...

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2010 Second International Conference on Communication Systems, Networks and Applications (ICCSNA 2010)

作者： Fei Li Institue of Signal Processing and Transmission Nanjing University of Posts and Telecommunication Nanjing,China Wei Wang Research & Development Division Nanjing KEDE Electronics Company Nanjing,China

Quantum Genetic Algorithm(QGA) is based on the concept and principles of quantum computing,such as quantum bit and superposition of *** of binary,numeric,or symbolic representation,QGA uses a Q-bit,defined as the smallest unit of information,for the probabilistic representation and a Q-bit individual as a string of Q-bits.A Q-gate is introduced as a variation operator to drive the individuals toward better solutions.A novel signal detector based on QGA for MIMO-OFDM system is *** analysis is given to the theoretical basis and practical performance of the proposed *** simulation results show that the proposed detector has more powerful properties in bit error rate than conventional Genetic Algorithm(GA) based detector and Vertical Bell Layered Space Time(VBLAST) algorithm based *** performance of the proposed detector is closer to optimal,compared with the other *** results demonstrated the effectiveness and the applicability of QGA in signal detection for MIMO-OFDM system.

关键词： Quantum Genetic Algorithm Signal Detection multi-input multi-output Orthogonal Frequency Division multiplexing

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An Overview of Different Topologies of multi-Port DC/DC Converters for DC Renewable Energy Source Applications

An Overview of Different Topologies of Multi-Port DC/DC Conv...

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International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology

作者： Ebrahim Babaei Okhtay Abbasi Simin Sakhavati Faculty of Electrical and Computer Engineering University of Tabriz

ISBN: (纸本)9781467397506

DC/DC converters are widely used in different applications such as renewable energy sources, hybrid electrical vehicles, and portable electronic devices. Recently, many researches have been done on dc/dc converters to increase the reliability and modularity and reduce the cost of these converters. The multi-port dc/dc converter is one of the common converters that widely used in dc renewable energy sources. The multi-port dc/dc converters are divided into single-input multi-output, multi-input single-output, and multi-input multi-output converters. The multi-input multi-output dc/dc converters can combine the different types of dc voltage sources with different V-I characteristics in input side and generate different levels of dc voltages at the output side. The main aim of using these converters is reducing the cost and number of power electronic components and increasing the reliability and efficiency of the overall system. Until now, different topologies of multi-port dc/dc converters have been presented. In this paper, some of the multi-port dc/dc converters are overviewed. Moreover, their advantages and disadvantages are investigated.

关键词： Dc-dc converter multi-port dc/dc converter multi-input multi-output Renewable energy sources

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Channel Capacity Analysis of UWB-MIMO System

Channel Capacity Analysis of UWB-MIMO System

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第六届智能交通、大数据及智慧城市国际会议

作者： Hesen Cheng Chong Shen Kun Zhang Bin Zhang Liwen Xu State Key Laboratory of Marine Resources Utilization in South China Sea Hainan University School of Information and Communication Engineering Hainan University Education Center of MTA Hainan Tropical Ocean University School of Information Engineering Heilongjiang International University School of Computer Science and Technology Hainan Tropical Ocean University

In the communication system,how to improve the system channel capacity has been a key research ***(multiple-input multiple-output) technology can greatly improve the channel *** combination of MIMO technology and UWB(Ultra-wideband) wireless communication technology forms a UWB-MIMO *** this paper,the UWB system,MIMO system,and UWB-MIMO system are mainly taken as the research objects,and whether the channel capacity of UWB-MIMO system is improved compared with MIMO and UWB wireless communication technology is *** channel capacity of the three technologies is obtained by formula calculation,and the corresponding results are obtained by comparison.

关键词： Ultra-wideband multi-input multi-output channel capacity UWB-MIMO

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Adaptive Modulation for Maximizing Practicable Sum Capacity in MU-MISO Downlink

Adaptive Modulation for Maximizing Practicable Sum Capacity ...

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IEEE Vehicular Technology Conference

作者： S. Alireza Banani Zhuo Chen Iain Collings Rodney Vaughan Dept. of Electrical and Computer Engineering University of Toronto Wireless and Networking Technologies Laboratory CSIRO ICT Centre School of Engineering Science Simon Fraser University

ISBN: (纸本)9781479944484

This paper addresses adaptive modulation and power allocation for maximizing the practicable sum capacity (sum of the uncoded throughputs of the users) of a multiuser multiple-input single-output (MU-MISO) system. Since the optimal solution, dirty paper encoding (DPC), is complicated to implement, we use the simpler linear precoding based on signal-to-leakage-plus-noise ratio (SLNR). For different choices of constellation sizes, the maximum practicable sum capacities and their corresponding optimal power allocations are obtained via individual non-convex optimization. The best constellation sizes for each user are then identified through a search for the highest maximized practicable sum capacity. Simulations demonstrate the significant performance improvement from this approach compared to existing power allocation schemes. Finally, a selection procedure between different constellation sets is presented to obtain the highest practicable sum capacity while maintaining the instantaneous BER of each user below a target value. This approach allows management of the trade-off between the capacity and error performances.

关键词： Adaptive modulation multiuser multi-input multi-output Power allocation Practicable capacity Sum capacity

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