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Information-Theoretic Security of MIMO Networks Under κ-μ Shadowed Fading Channels

IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2021年第7期70卷 6302-6318页

作者： Vega Sanchez, Jose David Moya Osorio, Diana Pamela Lopez-Martinez, F. Javier Paredes Paredes, Martha Cecilia Felipe Urquiza-Aguiar, Luis Escuela Politecn Nacl EPN Dept Elect Telecomunicac & Redes Informac Quito 170525 Ecuador Univ Oulu Ctr Wireless Communicat CWC Oulu 90014 Finland Univ Malaga Dept Ingn Comunicac Campus Excelencia Int Andalucia Technol Malaga 29071 Spain

This paper investigates the impact of realistic propagation conditions on the achievable secrecy performance of multiple-input multiple-output systems in the presence of an eavesdropper (Eve). Specifically, we concentrate on the kappa-mu shadowed fading model because its physical underpinnings capture a wide range of propagation conditions, while, at the same time, it allows for a much better tractability than other state-of-the-art fading models. By considering transmit antenna selection and maximal ratio combining reception at the legitimate (Bob) and Eve's receiver sides, we study two relevant scenarios: 1) the transmitter knows Bob's channel state information (CSI) but not Eve's CSI, and 2) the transmitter is aware of the CSI of both Bob and Eve channels. For this purpose, we first obtain novel and tractable expressions for the statistics of the maximum of independent and identically distributed (i.i.d.) variates related to the legitimate channel. Based on these results, we derive novel closed-form expressions of the two aforementioned scenarios to assess the secrecy performance of the underlying system. Specifically, for cases: 1) the secrecy outage probability (SOP), the probability of strictly positive secrecy capacity (SPSC), and 2) the average secrecy capacity (ASC). Moreover, we develop analytical asymptotic expressions of the SOP and ASC in the high signal-to-noise ratio regime. In all instances, secrecy performance metrics are characterized in closed-form, without requiring the evaluation of Meijer-G or Fox-H functions. Some useful insights on how the different propagation conditions and the number of antennas impact the secrecy performance are also provided.

关键词： kappa-mu shadowed generalized fading channels maximal ratio combining multiple-input multiple-output physical layer security transmit antenna selection

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Solving Doppler-Angle Ambiguity of BPSK-MIMO FMCW Radar System

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IEEE ACCESS 2021年 9卷 120347-120357页

作者： Jung, Jaehoon Lim, Sohee Kim, Seong-Cheol Lee, Seongwook Seoul Natl Univ Coll Engn Inst New Media & Commun Dept Elect & Comp Engn Seoul 08826 South Korea Korea Aerosp Univ Coll Engn Sch Elect & Informat Engn Gyeonggi Do 10540 South Korea

In a multiple-input multiple-output (MIMO) radar system, binary phase-shift keying (BPSK) modulation is widely used to separate signals transmitted from multiple transmit (Tx) antennas. However, when the BPSK modulation is applied to the frequency-modulated continuous-wave (FMCW) radar system, there is an occurrence of Doppler-angle ambiguity due to the properties of the modulation scheme. In other words, the maximum detectable velocity is reduced in proportion to the number of Tx antennas, and the angle estimation performance can be degraded when a moving target induces a Doppler phase shift. Therefore, in this paper, we propose a method for solving the Doppler-angle ambiguity in the BPSK-MIMO FMCW radar system. The proposed method involves comparing and arranging the phases of signals corresponding to the same target in the range-velocity detection results. By arranging the phases to form an arithmetic sequence, the signals from each Tx antenna can be distinguished and the unambiguous velocity and angle of the target can be estimated. In addition, by using a general phase-shift keying (PSK) modulation scheme, the proposed method can be applied to an arbitrary MIMO system regardless of the number of Tx antennas.

关键词： Radar antennas Radar Chirp Transmitting antennas Estimation Binary phase shift keying Receiving antennas Binary phase-shift keying Doppler-angle ambiguity frequency-modulated continuous-wave multiple-input multiple-output

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Design of a Multiband Antenna Using Auxiliary Classifier Wasserstein Generative Adversarial Network for IoT Applications

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 2025年第5期38卷

作者： Bessant, Y. R. Annie St Xaviers Catholic Coll Engn Dept Elect & Commun Engn Nagercoil Tamil Nadu India

The rapid expansion of Internet of Things (IoT) applications presents unprecedented challenges for antenna design, demanding solutions that are versatile, efficient, and capable of operating across multiple frequency bands. This paper addresses these challenges through the development of a design of a multiband antenna using Auxiliary Classifier Wasserstein Generative Adversarial Network for IoT applications (DMA-ACWGAN-IoT). Here, the Auxiliary Classifier Wasserstein Generative Adversarial Network (ACWGAN) is employed to generate synthetic data representing electromagnetic field distributions and antenna characteristics across various frequencies. The proposed metamaterial-based multiple-input multiple-output (MIMO) antenna contains four discrete elements, each provided by a micro strip feed. The structures overall width and length are 60 and 52 mm. The metamaterial is printed on a patch and dispersed from the fields with the most effective coupling. The proposed structures strong impedance bandwidth works at 8.3 GHz, 10.8 GHz, 12.3 GHz, 13.7 GHz, 16.1 GHz, and 18.1 GHz, fabricating the proposed antenna prototype using a substrate made of FR-4 material. The proposed DMA-ACWGAN-IoT design provides 6.5 dB maximum gain and 25.40%, 21.60%, and 20.05% higher efficiency compared to existing dual band antenna design with resonance frequency prediction under machine learning models (DBA-PRF-ML), machine learning verification depending on a distinctive SWB multiple slotted four-port high isolated MIMO antenna loaded with metasurface for the applications of IoT (SWB-MIMO-IOT-ML), and dual-band miniaturized composite right-left-handed transmission line ZOR antenna along machine learning method for microwave communication (DB-ZORA-MC-ML).

关键词： Auxiliary Classifier Wasserstein Generative Adversarial Network complementary split ring resonator internet of things multiband antenna multiple-input multiple-output

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Capacity Lower Bound of Visible Light Communications Precoding on Zonotopes

Capacity Lower Bound of Visible Light Communications Precodi...

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IEEE Wireless Communications and Networking Conference (IEEE WCNC)

作者： Wang, Xiaoqian Xia, Liang Yuan, Yifei Liu, Guangyi Wang, Qixing Wang, Jiangzhou China Mobile Res Inst Beijing Peoples R China Univ Kent Sch Elect Engn & Digital Arts Canterbury CT2 7NZ Kent England

ISBN: (纸本)9781665442664

As one of the potential candidate technologies for sixth generation (6G), visible light communication (VLC) can provide indoor communication services with high data rate when combined with multiple-input multiple-output (MIMO). In this paper, we first study the impact of precoding on zonotopes model of channel and then derive the capacity of VLC-MIMO with precoding when the number of transmitters is greater than receivers. Based on the zonotopes graph, two design principles for VLC-MIMO optimal precoding are obtained. Simulation results show that the commonly used radio frequency (RF)-MIMO precodings can hardly catch the capacity lower bound. The optimal precoding in RF may not be optimal in VLC.

关键词： 6G visible light communication lower bound multiple-input multiple-output zonotopes precoding

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Joint Precoding for Intelligent Reflecting Surface-Aided Millimeter Wave Secure Communications 3

Joint Precoding for Intelligent Reflecting Surface-Aided Mil...

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3rd Information Communication Technologies Conference (ICTC)

作者： Li, Wenmeng Zhang, Yehua Bian, Baoyin Yang, Hongzhen Li, Lang Wang, Xuan Wang, Jun-Bo Zhang, Hua NARI Grp Corp State Grid Elect Power Res Inst Nanjing 211106 Peoples R China State Grid Zhengjiang Elect Corp Informat & Telec Hangzhou 31005 Peoples R China Southeast Univ Natl Mobile Commun Res Lab Nanjing 211111 Peoples R China

ISBN: (纸本)9781665495080

In this paper, we investigate an intelligent reflecting surface (IRS) aided millimeter wave (mmWave) secure communication system. To maximize the secrecy rate at the legitimate receiver, we jointly optimize the active hybrid precoding at the transmitter and passive precoding at the IRS. Since the optimization problem is non-convex, an alternating optimization based algorithm is proposed, i.e., we iteratively solve digital baseband precoding, analog radio frequency precoding or one of the reflection coefficients with the others fixed. Simulation results show that our proposed algorithm can effectively improve the security performance of the system.

关键词： Intelligent reflecting surface multiple-input multiple-output millimeter wave hybrid precoding physical layer security

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Mitigation of Optical Carrier Power Fading in 3 x 3 MIMO V-Band Direct-Detection OFDM RoFMF System

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IEEE PHOTONICS TECHNOLOGY LETTERS 2021年第22期33卷 1246-1249页

作者： Huang, Ping-Yao Ting, Pin-Hsuan Huang, Yu-Jen Wei, Chia-Chien Lin, Chun-Ting Natl Chiao Tung Univ Inst Photon Syst Tainan 711 Taiwan Natl Yang Ming Chiao Tung Univ Inst Imaging & Biomed Photon Tainan 71150 Taiwan Natl Yang Ming Chiao Tung Univ Inst Lighting & Energy Photon Tainan 71150 Taiwan Natl Sun Yat Sen Univ Dept Photon Kaohsiung 804 Taiwan

Optical carrier power fading is a severe problem in radio-over-few-mode-fiber (RoFMF) direct-detection system. We propose a novel method to mitigate the issue of carrier power fading. By analyzing the property of mode coupling in a few-mode fiber, our method is to utilize the linear mode coupling. The method successfully reduces the interference among optical carriers without increasing complexity, achieving the estimated throughput of 114.71 Gbps in the RoFMF system with 1.7-m FMF and 3-m wireless transmission.

关键词： OFDM Fading channels MIMO communication Optical receivers Signal to noise ratio Couplings Optical polarization Wireless communication millimeter wave multiple-input multiple-output radio-over-fiber radio-over-few-mode-fiber mode-division-multiplexing

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Time Domain Channel Estimation for Time and Frequency Selective Millimeter Wave MIMO Hybrid Architectures: Sparse Bayesian Learning-Based Kalman Filter

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WIRELESS PERSONAL COMMUNICATIONS 2021年第3期117卷 2453-2473页

作者： Shoukath Ali, K. Sampath, P. Bannari Amman Inst Technol Dept ECE Sathyamangalam Tamil Nadu India

In this paper, a Sparse Bayesian Learning (SBL) based channel estimation technique for frequency selective millimeter wave (mmWave) channel in the time domain approach is developed. Further, SBL based Kalman filter (SBL-KF) for time and frequency selective mmWave multiple-input multiple-output (MIMO) hybrid architecture is presented. Hybrid precoders and combiners are designed to estimate the channel of mmWave MIMO systems. The hybrid precoding technique provides low power consumption and high achievable rate performance at mmWave frequencies. mmWave channels are sparse in nature, and the sparse recovery problem is estimated using the channel estimation technique. A simulation result of SBL-KF is improved by 4 dB and 10 dB of SNR compared to the conventional SBL and Orthogonal Matching Pursuit based scheme, respectively. The proposed SBL-KF scheme provides low estimation error at smaller training overheads M = 50 compared to the other existing work.

关键词： Orthogonal Matching Pursuit Millimeter wave Sparse Bayesian Learning multiple-input multiple-output

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OFDM-Based Generalized Optical MIMO

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2021年第19期39卷 6063-6075页

作者： Chen, Chen Zhong, Xin Fu, Shu Jian, Xin Liu, Min Yang, Helin Alphones, Arokiaswami Fu, H. Y. Chongqing Univ Sch Microelect & Commun Engn Chongqing 400044 Peoples R China Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore Tsinghua Univ Tsinghua Berkeley Shenzhen Inst TBSI Shenzhen 518055 Peoples R China

The combination of multiple-input multiple-output (MIMO) transmission and orthogonal frequency division multiplexing (OFDM) modulation has been shown to be an effective way to substantially enhance the capacity of bandlimited optical wireless communication (OWC) systems. In this paper, we propose four OFDM-based generalized optical MIMO (GO-MIMO) techniques for intensity-modulation and direct-detection OWC systems, including OFDM-based frequency-domain generalized spatial modulation (FD-GSM), frequency-domain generalized spatial multiplexing (FD-GSMP), time-domain generalized spatial modulation (TD-GSM) and time-domain generalized spatial multiplexing (TD-GSMP). For OFDM-based FD-GSM and FD-GSMP, spatial mapping is performed in the frequency domain, while it is carried out in the time domain for OFDM-based TD-GSM and TD-GSMP. To efficiently estimate both spatial and constellation symbols in each OFDM-based GO-MIMO technique, a corresponding maximum-likelihood (ML) detection algorithm is designed. Extensive simulations are conducted to evaluate and compare the performance of OFDM-based GO-MIMO techniques under various MIMO settings in a typical indoor environment. Simulation results demonstrate that there exists an optimal GO-MIMO technique to achieve a target spectral efficiency for a given receiver location, and the obtained optimal GO-MIMO technique is also related to the specific location of the receiver.

关键词： MIMO communication Optical transmitters Modulation Light emitting diodes GSM Optical modulation Frequency-domain analysis Optical wireless communication orthogonal frequency division multiplexing multiple-input multiple-output

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Active vibration control development in ultra-precision machining

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JOURNAL OF VIBRATION AND CONTROL 2021年第7-8期27卷 790-801页

作者： Aggogeri, Francesco Merlo, Angelo Pellegrini, Nicola Univ Brescia Dept Mech & Ind Engn Via Branze 38 I-25123 Brescia Italy Ce SI Ctr Studi Ind Via Tintoretto Cologno Monzese Italy

This study presents a combined feedback-feedforward adaptive regulator applied to an active vibration control tool holder platform to contain the effect of machining vibrations. The proposed mechatronic solution can be integrated in a milling machine tool as an interface between the beam (Z-axis) and the tool holder. The aim is to counteract vibrations in the broadband frequency range (100 Hz-900 Hz), controlling the tool position in real time. The active vibration control system is based on the harmonic steady-state concept due to the sinusoidal representation of the disturbance signals. The study focuses on the regulator architecture and the main logics applied to satisfy the required performance. A full investigation is executed through simulations and experimental campaigns, proving the disturbance reduction. The active vibration control system is implemented on a 4-axis machine tool and validated using multitonal disturbances. The system is evaluated in compensating a set of undesired effects, such as vibrations generated by unbalanced tools or hard material cutting processes. The obtained results show a maximum reduction of the vibration amplitude by 43.7% at the critical frequency.

关键词： Vibration adaptive control harmonic steady state multiple-input multiple-output

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Spatial spectrum approach for pilot spoofing attack detection in MIMO systems

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ETRI JOURNAL 2021年第5期43卷 941-949页

作者： Ning, Lina Li, Bin Wang, Xiang Liu, Xiaoming Zhao, Chenglin Beijing Univ Posts & Telecommun Sch Informat & Commun Engn Beijing Peoples R China Beijing Jianyi Co Ltd Beijing Peoples R China

In this study, a spatial spectrum method is proposed to cope with the pilot spoofing attack (PSA) problem by exploiting the of uplink-downlink channel reciprocity in time-division-duplex multiple-input multiple-output systems. First, the spoofing attack in the uplink stage is detected by a threshold derived from the predefined false alarm based on the estimated spatial spectrum. When the PSA occurs, the transmitter (That is Alice) can detect either one or two spatial spectrum peaks. Then, the legitimate user (That is Bob) and Eve are recognized in the downlink stage via the channel reciprocity property based on the difference between the spatial spectra if PSA occurs. This way, the presence of Eve and the direction of arrival of Eve and Bob can be identified at the transmitter end. Because noise is suppressed by a spatial spectrum, the detection performance is reliable even for low signal-noise ratios and a short training length. Consequently, Bob can use beamforming to transmit secure information during the data transmission stage. Theoretical analysis and numerical simulations are performed to evaluate the performance of the proposed scheme compared with conventional methods.

关键词： multiple-input multiple-output physical layer security pilot spoofing attack spatial spectrum method time-division duplex

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