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Design and development of planar antenna array for mimo application

WIRELESS NETWORKS 2021年第2期27卷 939-946页

作者： Prabhu, T. Pandian, S. Chenthur SNS Coll Technol Dept Elect & Commun Engn Coimbatore Tamil Nadu India SNS Coll Technol Dept Elect & Elect Engn Coimbatore Tamil Nadu India

multi-input multi-output (MIMO) is the need for recent communication system for the enhancement of channel capacity. While the number of antenna array elements increased, the spacing between the array elements and size of the antenna reduced. Hence high coupling between the elements occur, and thus the channel capacity reduced. There were several existing methods employs, however there were some limitations like reduced gain, dielectric constant, and bandwidth. So as to overcome this and to increase the performance characteristics such as bandwidth, gain of MIMO antennas and to lessen the dielectric constant of substrate material this proposed scheme is introduced. Using these considerations and requirements, an array of two-element MIMO system will be designed and developed with a less dielectric material (epsilon r<4. So in this Taconic RF-35 (dielectric constant is 3.5), Two T-Shaped antennas are employed for 2.45 GHz (ISM band) with multiple modes of operation to achieve the improved bandwidth of about - 10 db. Simulation is done by HFSS 13.0.

关键词： multi-input multi-output Two T-shaped antennas Taconic RF-35 ISM band Dielectric constant

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Exploiting Faster-Than-Nyquist Signaling for MIMO Covert Communications: A Low-Complexity Design

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2024年第5期73卷 7322-7327页

作者： Zhang, Yuchen Ning, Boyu Ni, Wanli Wang, Jianquan Tang, Wanbin Niyato, Dusit Univ Elect Sci & Technol China Natl Key Lab Wireless Commun Chengdu 611731 Peoples R China Kash Inst Elect & Informat Ind Kash 844000 Peoples R China Tsinghua Univ Dept Elect Engn Beijing 100084 Peoples R China Nanyang Technol Univ Sch Comp Sci & Engn Singapore 639798 Singapore

In this article, we present an investigation into the use of faster-than-Nyquist (FTN) signaling in multiple-input multiple-output (MIMO) covert communications with a multi-antenna warden. We formulate an optimization problem to maximize the covert rate subject to the covertness and transmit power constraints. Due to the dimensional expansion of variables, solving the formulated problem by conventional convex optimization method incurs unaffordable computational overhead. To circumvent this issue, we propose a low-complexity linear precoding and equalization method to nullify the energy leakage towards the warden while decoupling the MIMO FTN signaling into independent substreams simultaneously, and allocate the power by a new scaled water-filling approach. Numerical results validate the superiority of FTN signaling in MIMO covert communications over the Nyquist counterpart, and also show the effectiveness of our proposed scheme, which merely causes minor performance loss compared to the optimal baseline.

关键词： MIMO communication Symbols Precoding Resource management Receiving antennas Electronic mail Wireless communication Covert communications faster-than-Nyquist signaling multi-input multi-output power allocation

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Improving Wireless Physical Layer Security via Exploiting Co-Channel Interference

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IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING 2016年第8期10卷 1433-1448页

作者： Li, Lingxiang Petropulu, Athina P. Chen, Zhi Fang, Jun Univ Elect Sci & Technol China Natl Key Lab Sci & Technol Commun Chengdu 611731 Peoples R China Rutgers State Univ Dept Elect & Comp Engn New Brunswick NJ 08854 USA

This paper considers a scenario in which a source-destination pair needs to establish a confidential connection against an external eavesdropper, aided by the interference generated by another source-destination pair that exchanges public messages. The goal is to compute the maximum achievable secrecy degrees of freedom (S.D.o.F) region of a MIMO two-user wiretap network. First, a cooperative secrecy transmission scheme is proposed, whose feasible set is shown to achieve all S.D.o.F. pairs on the S.D.o.F. region boundary. In this way, the determination of the S.D.o.F. region is reduced to a problem of maximizing the S.D.o.F. pair over the proposed transmission scheme. The maximum achievable S.D.o.F. region boundary points are obtained in closed form, and the construction of the precoding matrices achieving the maximum S.D.o.F. region boundary is provided. The proposed expressions are functions of the number of antennas at each terminal, and apply to any number of antennas, thus constituting an advancement over prior works that have considered only fixed antenna configurations.

关键词： Physical-layer security cooperative communications multi-input multi-output secrecy degrees of freedom (SDo.F)

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A Novel Precoding and Impulsive Noise Mitigation Scheme for MIMO Power Line Communication Systems

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IEEE SYSTEMS JOURNAL 2019年第1期13卷 6-17页

作者： Qian, Yuwen Zhou, Xiangwei Li, Jun Shu, Feng Jayakody, Dushantha Nalin K. Nanjing Univ Sci & Technol Sch Elect & Opt Engn Nanjing 210094 Jiangsu Peoples R China Louisiana State Univ Div Elect & Comp Engn Baton Rouge LA 70803 USA Southeast Univ Natl Mobile Commun Res Lab Nanjing 210018 Jiangsu Peoples R China Natl Res Tomsk Polytech Univ Sch Comp Sci & Robot Tomsk 634050 Russia Natl Res Tomsk Polytech Univ Dept Software Engn Inst Cybernet Tomsk 634050 Russia

Power line communications (PLCs) enable new and flexible networking functions in smart grids. However, due to the high attenuation and interference, it is a great challenge for PLC to achieve reliable and high data rate transmissions. Thus, we propose a multiple-input multiple-output (MIMO) architecture to improve the reliability and data rate for PLC networks. In viewing the data rate requirements of in-home PLC network systems, we develop a precoding scheme to maximize the system throughput. In harmonizing to the proposed precoding scheme, the closed-form of the sum data rate of the PLC-MIMO channel is derived. To improve the communication reliability, we propose a partial transmission sequence (PTS) based algorithm to mitigate the noise in PLC channels. The closed-form of the symbol error rate (SER) is derived according to the probability density function of the impulsive noise in PLC channels. Simulation results demonstrate that the proposed precoding scheme achieves a better throughput when compared to the conventional precoding schemes. Furthermore, the PTS-based noise mitigation algorithm significantly improves the SER performance of PLC links.

关键词： Impulsive noise multi-input multi-output power line communications (PLCs) precoding smart grid

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MIMO Secret Communications Against an Active Eavesdropper

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IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY 2017年第10期12卷 2387-2401页

作者： Li, Lingxiang Petropulu, Athina P. Chen, Zhi Rutgers State Univ Dept Elect & Comp Engn New Brunswick NJ 08854 USA Univ Elect Sci & Technol China Natl Key Lab Sci & Technol Commun Chengdu 611731 Sichuan Peoples R China

This paper considers a scenario in which an Alice-Bob pair wishes to communicate in secret in the presence of an active Eve, who is capable of jamming as well as eavesdropping and operates in full-duplex (FD) mode. As countermeasure, Bob operates in FD mode, using a subset of its antennas to receive, and the remaining antennas to transmit jamming noise. Alice and Bob employ linear precoding, and all nodes use Gaussian code books. In that context, our goal is to maximize the achievable secrecy degrees of freedom (S.D.o.F.) of the system. We provide the optimal receive/transmit antennas allocation at Bob, based on which we determine in closed form the maximum achievable S.D.o.F. We also provide a method for constructing the precoding matrices of Alice and Bob, based on which the maximum S.D.o.F. can be achieved. We further investigate the adverse scenario in which Eve knows Bob's transmission strategy and optimizes its transmit/receive antennas allocation in order to minimize the achievable S.D.o.F. For that case, we find the worst case achievable S.D.o.F. Numerical results validate the theoretical findings and demonstrate the performance of the proposed method.

关键词： Physical-layer security cooperative communications multi-input multi-output active eavesdropper

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Control Method for multiple-input multiple-output Non-Gaussian Random Vibration Test

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PACKAGING TECHNOLOGY AND SCIENCE 2017年第7期30卷 331-345页

作者： Zheng, Ronghui Chen, Huaihai He, Xudong Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Mech Struct Nanjing 210016 Jiangsu Peoples R China

A control method for multi-input multi-output non-Gaussian random vibration test based on an improved zero-memory nonlinear transformation and an inverse system method is proposed. Compared with the classic zero-memory nonlinear transformation method, the improved one can overcome the defect of the dynamic range loss. The inverse system method is put forward in order to control the kurtoses and the spectra for multi-input multi-output non-Gaussian random vibration test simultaneously. The main idea of inverse system method is to generate the Gaussian reference response signals first from the reference spectra, and the improved zero-memory nonlinear transformation method is utilized to obtain the non-Gaussian reference response signals with the reference kurtoses, then the continuous and stationary coupled driving signals can be derived from the relationship between the inputs and outputs of the test system. Thus, the difficulty in generation of driving signals in multi-input multi-output non-Gaussian random vibration test can be overcome. The matrix power control algorithm is introduced for the spectrum control, and a kurtosis control algorithm is set up similarly. A simulation example and an experimental test are provided in the paper, and the results illustrate the effectiveness and feasibility of the proposed control method. Copyright (c) 2017 John Wiley & Sons, Ltd.

关键词： random vibration test non-Gaussian multi-input multi-output kurtosis inverse system method

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multiple-input multiple-output non-stationary non-Gaussian random vibration control by inverse system method

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MECHANICAL SYSTEMS AND SIGNAL PROCESSING 2019年 124卷 124-141页

作者： Zheng, Ronghui Chen, Huaihai He, Xudong Vandepitte, Dirk Nanjing Univ Aeronaut & Astronaut State Key Lab Mech & Control Mech Struct Coll Aerosp Engn Nanjing 210016 Jiangsu Peoples R China Katholieke Univ Leuven Dept Mech Engn Kasteelpk Arenberg 41 B-3001 Leuven Belgium

This paper investigates the control method for multi-input multi-output non-stationary non-Gaussian random vibration test with the specified references composed of stationary power spectra, moving root mean square distributions and moving kurtosis distributions. The objective of random vibration test is to force the response signals of test structure to satisfy the specified references within tolerances. An inverse system method in time domain is used to guarantee the control of response time-frequency characteristics independently and simultaneously. The evolutionary spectrum theory is utilized to establish the matrix representation of non-stationary non-Gaussian input-output relationships of a linear dynamic system in frequency domain. To analyze a non-stationary non-Gaussian vibration signal, two sets of random numbers named moving root mean square and moving kurtosis are used to modulate a stationary random signal. The transformation process theory is utilized to obtain moving root mean square and moving kurtosis by a moving root mean square distribution and a moving kurtosis distribution respectively. The control algorithms are presented to update the drive signals according to the deviations between responses and references. A numerical example by a cantilever beam and a biaxial vibration test are carried out and the results demonstrate the feasibility and validity of the proposed methods. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： multi-input multi-output Vibration test Non-Gaussian Non-stationary Inverse system method

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Linear Precoder Design for an MIMO Gaussian Wiretap Channel With Full-Duplex Source and Destination Nodes

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IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY 2018年第2期13卷 421-436页

作者： Li, Lingxiang Chen, Zhi Petropulu, Athina P. Fang, Jun Univ Elect Sci & Technol China Natl Key Lab Sci & Technol Commun Chengdu 611731 Sichuan Peoples R China Rutgers State Univ Dept Elect & Comp Engn New Brunswick NJ 08854 USA

This paper investigates and quantifies the advantages of a Full-Duplex (FD) transmitter/receiver pair in improving the secrecy rate of the system. We consider a linear precoder design for a multiple-input multiple-output Gaussian wiretap channel, which comprises two legitimate nodes, i.e., Alice and Bob, operating in FD mode and exchanging confidential messages in the presence of a passive eavesdropper. Using the sum secrecy degrees of freedoms (sum SDoFs) as metric, we formulate an optimization problem with respect to Alice's and Bob's precoding matrices. In order to solve this problem, we first propose a cooperative secrecy transmission scheme, whose feasible set is sufficient to achieve the maximum sum SDoF. Based on that feasible set, we then determine in closed form the maximum achievable sum SDoF and also provide a method for constructing the precoding matrix pair, which achieves the maximum sum SDoF. The latter pair would be near-optimal in terms of the achievable secrecy sum rate in the high signal-to-noise ratio (SNR) regime. By providing the maximum achievable sum SDoF as a function of the number of antennas, one could select the optimal system parameters to further maximize the achievable sum SDoF. We use simulations to evaluate the performance of the proposed precoding matrices in realistic channel scenarios and at various levels of the SNR.

关键词： Physical-layer security cooperative communications multi-input multi-output full-duplex

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Performance of Two-Way Relay Networks with Generalized Transmit and Receive Antenna Selection over Rayleigh Fading Channels

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WIRELESS PERSONAL COMMUNICATIONS 2017年第4期95卷 4789-4805页

作者： Fidan, Efendi Kucur, Oguz Gebze Tech Univ Elect Engn Dept TR-41400 Gebze Kocaeli Turkey TUBITAk UME Time Frequency & Wavelength Lab TR-41470 Gebze Kocaeli Turkey

In this work, we study a generalized antenna selection strategy in two way relay networks over Rayleigh fading channels where multi antennas are selected in sources for both transmission and reception and relay is equipped with single antenna. Exact and asymptotic expressions for cumulative distribution function of end-to-end signal-to-noise ratio and sum symbol error rate are derived in closed form. The theoretical expressions are validated by using Monte Carlo simulation technique .

关键词： Generalized transmit and receive antenna selection Two way relaying networks multi-input multi-output Rayleigh fading Amplify-and-forward

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Performance of Transceiver Antenna Selection in Two Way Full-Duplex Relay Networks Over Rayleigh Fading Channels

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2018年第7期67卷 5909-5921页

作者： Fidan, Efendi Kucur, Oguz Gebze Tech Univ TUBITAK UME Natl Metrol Inst TUBITAK UME TR-41400 Kocaeli Turkey Gebze Tech Univ Dept Elect Engn TR-41400 Kocaeli Turkey

A novel transceiver antenna selection (TRAS) strategy selecting a pair of antennas for transmission and reception at terminal sources for full-duplex amplify-forward multi-input multi-output two way relay networks is proposed. Antenna pair is selected in accordance with maximum and second maximum signal to self-interference-plus-noise ratio between the sources and relay, where the terminal sources and relay are full-duplex. Unlike reciprocal channel gains, forward and backward paths between the sources and relay are taken to be different. With four different antenna selection (AS) scenarios, the exact sum outage probability (SOP) for fading self-interference (SI) and the exact, approximated, and asymptotic SOP expressions for nonfading SI over Rayleigh fading channels are derived and validated via Monte Carlo simulation technique. The proposed AS strategy uses all antenna space for either transmission or reception which results in a reduction in total number of antennas at each terminal node. It is shown that performance can be significantly improved by usage of offered TRAS strategy at terminal sources. For example, up to 25 dB gain is obtained for five antennas at the sources with respect to no selection case of two antennas. In addition, it outperforms the selection strategy using maximum paths from two divided antenna sets at each source, where one set is only used for transmission and the other one for reception. The diversity order of the system is proven to be dependent on SI and varies between zero and minimum of the total number of antennas of two sources minus 1. For different SI values, optimum power allocations are demonstrated and factors affecting optimum relay location are also elaborated. Each AS scenario produces the lowest SOP for different combinations of SI occurrences, power allocations, and relay locations.

关键词： Transceiver antenna selection transmit antenna selection receive antenna selection full duplex half duplex two way relaying networks multi-input multi-output rayleigh fading amplify-and-forward

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