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A compact dual polarized ultrawideband multiple-input- multiple-output antenna

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2016年第1期58卷 163-166页

作者： Khan, Muhammad Saeed Capobianco, Antonio-Daniele Iftikhar, Adnan Asif, Sajid Braaten, Benjamin D. Univ Padua Dipartimento Ingn Informaz I-35131 Padua Italy N Dakota State Univ Dept Elect & Comp Engn Fargo ND 58102 USA

A multiple-input-multiple-output (MIMO) antenna with dual polarization, operating in the UWB frequency range is proposed. The radiator is shared by the two antenna elements, which greatly reduces the overall size of the MIMO antenna system. Slots are etched in the radiator to achieve the desired isolation among the elements. Dual polarization characteristics of the radiator are attained in the far-field due to orthogonal currents. The comparison of simulated and measured results show that the proposed MIMO antenna operates on a wide range from 3 to 11 GHz with a low mutual coupling (<-15 dB) and also a low envelope correlation coefficient. A prototype was fabricated on low loss Rogers TMM4 laminate measuring only 25 x 27 mm(2), which is a very compact design. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:163-166, 2016

关键词： dual polarization envelop correlation coefficient multiple-input multiple-output ultrawideband

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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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A unified framework for multiple-input multiple-output and bistatic synthetic aperture sonar processing

A unified framework for multiple-input multiple-output and b...

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Oceans 2015 Genova

作者： Xu, Wen Sun, Feng Fan, Shuangshuang Pan, Xiang Zhejiang Univ Dept Informat Sci & Elect Engn Hangzhou 310027 Peoples R China Boundary Elect Technol Inc Hangzhou 310052 Zhejiang Peoples R China

ISBN: (纸本)9781479987375

Conventional monostatic synthetic aperture sonar (SAS) imaging is based on the point target assumption, and may suffer from the target scattering fluctuation within the scope of the synthesized aperture. Bistatic sonar can sample target scattering pattern (TSP) at any angle rather than from only the back scattering direction. It offers potential advantages when faced with an anisotropic target, but is still subject to limited mainlobe width of the TSP. In this paper we construct a unified framework of coherent and non-coherent processing, where the concept of multiple-input multiple-output (MIMO) and SAS are closely integrated to overcome the above-mentioned problem. Both bistatic sonar and MIMO sonar embody the concept of "Multi-", admitting the existence of spatial fading of acoustic targets and trying to make use of it. It is straightforward to migrate a conventional SAS to MIMO-SAS by putting multiple transmitters to insonify the target from different angles. An example realization of the framework using two transmitters is demonstrated.

关键词： Synthetic aperture processing bistatic target scattering pattern multiple-input multiple-output waveform diversity

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A unified framework for multiple-input multiple-output and bistatic synthetic aperture sonar processing

A unified framework for multiple-input multiple-output and b...

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OCEANS

作者： Wen Xu Feng Sun Shuangshuang Fan Xiang Pan Department of Information Science and Electronic Engineering Zhejiang University Hangzhou China 310027 Boundary Electronic Technologies Inc. Hangzhou China 310052

ISBN: (纸本)9781479987375

关键词： Synthetic aperture processing bistatic target scattering pattern multiple-input multiple-output waveform diversity

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Simplified log likelihood ratio calculation in soft ordered successive interference cancellation for multiple-input multiple-output digital video broadcasting-second generation terrestrial receivers

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IET COMMUNICATIONS 2014年第18期8卷 3280-3289页

作者： Kang, In-Woong Lee, Young-Jun Kim, Youngmin Seo, Jae Hyun Kim, Heung Mook Kim, Hyoung-Nam Pusan Natl Univ Dept Elect & Comp Engn Pusan South Korea ETRI Broadcasting Syst Res Dept Taejon South Korea

This study proposes a soft ordered successive interference cancellation (OSIC) receiver accompanied by a simplified log-likelihood ratio calculation method for a dual-polarised multiple-input multiple-output (MIMO) digital video broadcasting-second generation terrestrial system. The future terrestrial transmission systems will be required to provide high data rates for ultra-high definition television service. For this purpose, dual-polarised MIMO techniques with a little cross-antenna interference and high-order modulation schemes have been considered. As the cross-antenna interference needs to be removed, a soft OSIC receiver can be used effectively. However, the receiver has to endure high computational complexity for calculating soft values. To reduce it, the authors simplified the calculation based on the decision threshold (DT) method. The main contribution of this study is to extend the conventional DT method, which is restricted to only low-order modulations, to an algorithmic process applicable to any modulation order. The proposed soft OSIC receiver has about 1 dB degradation from the soft OSIC receiver with the maximum-likelihood calculation of soft values. The degradation can be fully rewarded by the significantly reduced computational complexity. Furthermore, this study presents an additional possibility of improving the decoding performance by modelling the OSIC equaliser as a biased estimator.

关键词： interference suppression MIMO communication television receivers digital video broadcasting television antennas modulation decoding equalisers communication complexity high definition television antenna arrays soft ordered successive interference cancellation multiple-input multiple-output digital video broadcasting-second generation terrestrial receivers dual-polarised MIMO techniques log-likelihood ratio calculation method digital video broadcasting second generation terrestrial system terrestrial transmission systems ultra-high deflnition television service cross-antenna interference high-order modulation schemes soft OSIC receiver computational complexity decision threshold method low-order modulations algorithmic process maximum-likelihood calculation decoding performance OSIC equaliser biased estimator

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Development and Validation of Hybrid SISO and MIMO OTA Testing Systems in Multiprobe Anechoic Chamber Setups

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 2025年 74卷

作者： Liu, Binhui Zhao, Kai Wei, Jianchuan Gao, Huaqiang Chen, Xiaoming Minist Ind & Informat Technol MIIT Elect Res Inst 5 Guangzhou 511370 Peoples R China Key Lab MIIT Intelligent Prod Testing & Reliabil Guangzhou 511370 Peoples R China Xi An Jiao Tong Univ Sch Informat & Commun Engn Xian 710049 Peoples R China

The multiprobe anechoic chamber (MPAC) is recognized for its ability to emulate various communication scenarios accurately. Traditional MPAC systems, however, often require separate setups for single-input single-output (SISO) and multiple-input multiple-output (MIMO) over-the-air (OTA) testing, leading to high costs and inefficiency. To address this issue, we have designed a low-cost, high-efficiency MPAC system that is compatible with SISO, 2-D, and 3-D MIMO testing. First, our innovative design integrates a vertical probe ring and a 3-D horizontal probe ring, enabling the MPAC system to support SISO, 2-D, and 3-D MIMO OTA testing. The layout of the probe rings is optimized to minimize reflections between antennas, thus improving testing accuracy. Additionally, based on the testing requirements for various devices, we designed and optimized the MPAC OTA testing system's link, guiding the selection of key components such as amplifiers, switches, and cables, which endows the MPAC system with a greater dynamic range and compatibility with more devices. Furthermore, we improved the traditional complicated and time-consuming calibration procedures by proposing rapid calibration schemes for both SISO and MIMO OTA testing systems. With a laser positioning system and normalization calibration method employed, the calibration time is reduced from 1 to 2 days to within 10 min. Finally, we conducted quiet zone ripple testing, SISO total radiated power (TRP) and total isotropic sensitivity (TIS) testing validation, and MIMO channel model testing validation. These tests demonstrated the effectiveness and accuracy of the designed MPAC system in supporting SISO, 2-D, and 3-D MIMO OTA testing.

关键词： Testing Probes Three-dimensional displays Calibration Gain Anechoic chambers Accuracy 5G mobile communication Power amplifiers Loss measurement multiple-input multiple-output multiprobe anechoic chamber (MPAC) over-the-air (OTA) testing rapid calibration single-input single-output (SISO)

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Optimizing spatial modulation MIMO IoT systems with full-duplex/half-duplex UAVs and enhanced transmit antenna selection

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PERFORMANCE EVALUATION 2025年 168卷

作者： Phung, Bao The Nguyen, Ba Cao Vinh, Nguyen Van Minh, Bui Vu Nhan, Nguyen Huu Khanh Ho Chi Minh City Univ Ind & Trade Fac Informat Technol Ho Chi Minh City Vietnam Telecommun Univ Khanh Hoa Vietnam FPT Univ Dept Informat Assurance IA Hanoi Vietnam Nguyen Tat Thanh Univ Fac Engn & Technol Ho Chi Minh City Vietnam Ton Duc Thang Univ Fac Elect & Elect Engn Commun & Signal Proc Res Grp Ho Chi Minh City Vietnam Ton Duc Thang Univ 19 Nguyen Huu Tho StTan Phong WardDist 7 Ho Chi Minh City Vietnam

multiple-input multiple-output (MIMO) systems play a crucial role in elevating the efficiency and reliability of communication networks, especially within Internet of Things (IoT) applications. This article introduces a novel approach involving full-duplex (FD) and half-duplex (HD) relays mounted on unmanned aerial vehicles (UAVs) to enhance MIMO systems. Incorporating spatial modulation (SM) and transmit antenna selection (TAS) techniques aims to optimize system performance while reducing computational complexity to meet IoT requirements. The article mathematically formulates outage probabilities (OPs) and system throughputs (STs) for the proposed MIMO-IoT-UAV systems utilizing SM with FD/HD-UAV, both with and without TAS, over practical Nakagami-m channels. Numerical illustrations underscore the advantages of employing FD/HD-UAV and TAS in MIMO-IoT-UAV systems. Specifically, OPs with TAS are significantly lower, while STs with TAS are notably higher than their counterparts without TAS. Additionally, TAS with FD-UAV yields greater benefits than HD-UAV, particularly in preventing the error floor associated with residual self-interference (RSI). To mitigate this error floor in MIMO-IoT-UAV systems using FD-UAV, an effective strategy involves increasing the number of transmit/receive antennas. The choice between FD and HD modes hinges on parameters such as transmit power, data rate, and RSI. Depending on these factors, FD-UAV performance may exhibit lower or higher error rates than HD-UAV. Hence, the optimal selection of FD or HD mode, combined with TAS, is essential for enhancing MIMO-IoT-UAV system performance. This optimization process should consider parameters like RSI level, the number of transmit/receive antennas, data rate requirements, and UAV position to ensure efficient and reliable communication across diverse scenarios.

关键词： Unmanned aerial vehicles multiple-input multiple-output Spatial modulation Full/half-duplex Transmit antenna selection Outage probability System throughput

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Automatic Identification of Space-Time Block Coding for MIMO-OFDM Systems in the Presence of Impulsive Interference

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IEEE TRANSACTIONS ON COMMUNICATIONS 2024年第8期72卷 4816-4828页

作者： Zhang, Junlin Liu, Mingqian Chen, Yunfei Zhao, Nan Nallanathan, Arumugam Xidian Univ State Key Lab Integrated Serv Networks Xidian 710071 Shaanxi Peoples R China Xidian Univ Collaborat Innovat Ctr Informat Sensing & Understa Xian 710071 Shaanxi Peoples R China Univ Durham Dept Engn Durham England Dalian Univ Technol Sch Informat & Commun Engn Dalian 116024 Peoples R China Queen Mary Univ London Sch Elect Engn & Comp Sci London E1 4NS England

Signal identification, a vital task of intelligent communication radios, finds its applications in various military and civil communication systems. Previous works on identification for space-time block codes (STBC) of multiple-input multiple-output (MIMO) system employing orthogonal frequency division multiplexing (OFDM) are limited to additive white Gaussian noise. In this paper, we develop a novel automatic identification algorithm to exploit the generalized cross-correntropy function of the received signals to classify STBC-OFDM signals in the presence of Gaussian noise and impulsive interference. This algorithm first introduces the generalized cross-correntropy function to fully utilize the space-time redundancy of STBC-OFDM signals. The strongly-distinguishable discriminating matrix is then constructed by using the generalized cross-correntropy for multiple receive antennas. Finally, a decision tree identification algorithm is employed to identify the STBC-OFDM signals which is extended by the binary hypothesis test. The proposed algorithm avoids the traditionally required pre-processing tasks, such as channel coefficient estimation, noise and interference statistics prediction and modulation type recognition. Numerical results are presented to show that the proposed scheme provides good identification performance by exploiting the generalized cross-correntropy function of STBC-OFDM signals under impulsive interference circumstances.

关键词： Interference OFDM Gaussian noise Classification algorithms Modulation Block codes Symbols Impulsive interference multiple-input multiple-output orthogonal frequency division multiplexing signal identification space-time block code

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A six-port High Isolation millimeter wave MIMO antenna based on Array-antenna Decoupling Surface for Next-Generation Wireless Networks

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AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS 2025年 196卷

作者： Mani, Sathish Paik, Harikrishna Vel Tech Rangarajan Dr Sagunthala R&D Inst Science Chennai Tamil Nadu India

This paper presents a compact-sized six-port millimeter wave multiple-input multiple-output (MIMO) antenna for next generation wireless network applications. A rectangular patch loaded with a Sierpinski slot is designed as a main radiator to resonate at 31 GHz in the millimeter wave spectrum on a hexagonal-shaped substrate. An Array-antenna Decoupling Surface (ADS) consisting of primary and secondary reflectors is embedded to improve the isolation in the MIMO system. The presented MIMO configuration has a footprint of 13.86 mm x 16 mm, designed on Rogers RT/Duroid 5880 substrate with a thickness of 0.508 mm. Despite its compactness, the proposed MIMO antenna provides an impressive isolation of about -35 dB between the adjacent ports and a satisfactory gain of 9.8 dB in the whole band of operation. A prototype of the design is fabricated and tested. The measured results show a -10 dB impedance bandwidth in the range of 30.2-31.8 GHz. The investigated diversity parameters resulted in an Envelope Correlation Coefficient (ECC) below 0.18, Channel Capacity Loss (CCL) less than 0.1 bits/s/Hz, and Group Delay within 1.2 ns. Based on these attributes, the suggested MIMO antenna may be well suited for compatibility with millimeter-wave high-capacity wireless networks.

关键词： Array-antenna Decoupling Surface fifth generation multiple-input multiple-output mutual coupling millimeter wave frequency

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