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Cut-off rate of multiple antenna systems over frequency-flat, fast fading channels

IEICE TRANSACTIONS ON COMMUNICATIONS 2006年第4期E89B卷 1440-1442页

作者： Park, S Lee, K Park, SC Korea Adv Inst Sci & Technol Taejon South Korea

For multilevel-coded modulation, the cut-off rate of multiple antenna systems over frequency-flat, fast fading channels is derived. Following Wozencraft's approach, a closed-form expression for the cut-off rate is obtained as a function of energy ratio per dimension It is shown that the maximum value of cut-off rate increases linearly with the number of transmit antennas.

关键词： cut-off rate multi-input multi-output frequency-flat fast fading

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Coupled-Core multi-Core Fibers for Spatial multiplexing

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IEEE PHOTONICS TECHNOLOGY LETTERS 2013年第21期25卷 2054-2057页

作者： Arik, Sercan Oe. Kahn, Joseph M. Stanford Univ Edward L Ginzton Lab Dept Elect Engn Stanford CA 94305 USA

Coupled-core multi-core fibers (MCFs) offer characteristics that are beneficial for long-haul spatially multiplexed transmission. Using full-vector solution of the wave equation, we study the number of propagating modes and several modal characteristics, including intermodal beat lengths, group delay spread, mode-dependent chromatic dispersion, and intramodal and intermodal effective areas. We identify a range of design parameters that simultaneously optimizes these characteristics. Our results demonstrate the limited accuracy of perturbation-based analyses in characterizing MCFs with closely spaced cores.

关键词： multi-core fibers multi-mode fibers multi-input multi-output equalization mode coupling modal dispersion mode-division multiplexing spatial multiplexing

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A dual-band WLAN/UWB printed wide slot antenna for mimo/diversity applications

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2013年第3期55卷 461-465页

作者： Mohammad, Sajad Nezhad, Ali Hassani, Hamid Reza Foudazi, Ali Shahed Univ Dept Elect & Elect Engn Tehran Iran

In this article, a dual-band WLAN/ultrawideband (UWB) printed wide slot microstrip-fed antenna is presented for multi-input multi-output (MIMO)/diversity *** proposed antenna consists of a U-shaped patch, a T-shaped monopole path, and a pentagonal wide slot in the ground plane. The antenna is designed to cover both the WLAN (2.42.485 GHz) and UWB (3.110.6 GHz) ranges, with value of S11 below -10 dB. The antenna is constructed on a FR4 substrate with overall dimensions of 28 x 28 x 1 mm3. It is shown that the proposed dual-band antenna is suitable for diversity polarization applications. The simulation results show that the different configurations of the antenna in the MIMO/diversity have good S-parameters over the operating frequency bands. The simulation and measured results of the proposed dual-band antenna as well as that of the MIMO/diversity antenna configuration agree well. (C) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:461465, 2013;View this article online at ***. DOI 10.1002/mop.27391

关键词： ultrawideband antenna monopole antenna multi-input multi-output diversity

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Iterative layered space-time receivers for single-carrier transmission over severe time-dispersive channels

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IEEE COMMUNICATIONS LETTERS 2004年第9期8卷 579-581页

作者： Dinis, R Kalbasi, R Falconer, D Banihashemi, AH Univ Tecn Lisboa Inst Super Tecn CAPS P-1049001 Lisbon Portugal Carleton Univ Dept Syst & Comp Engn BCWS Ctr Ottawa ON K1S 5B6 Canada

This letter presents an iterative layered space-time (LST) receiver structure for single-carrier (SC)-based transmission in severe time-dispersive channels. The proposed receiver combines LST principles with iterative block decision feedback equalization (IB-DFE) techniques. Our performance results show that the proposed receivers have excellent performance in severe time-dispersive channels, which can he very close to the matched filter bound (MFB) after just a few iterations.

关键词： frequency-domain equalization interference suppression multi-input multi-output (MIMO) systems multi-path channels

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User selective mode-forming remote switch in multi-mode fiber distributing networks using MIMO processing

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OPTICS COMMUNICATIONS 2017年 392卷 234-238页

作者： Morizumi, Yuki Kobayashi, Hirokazu Iwashita, Katsushi Kochi Univ Technol Dept Elect & Photon Syst Engn 185 Miyanokuchi Tosayamada Kami City Kochi 7828502 Japan

A mode-forming remote switch in multi-mode fiber distributing networks has been proposed. It can transmit the desired data to the desired port by adjusting transmitter signals. Feasibilities of the proposed scheme are confirmed by switching sub-carrier BPSK signal to the selected port. A graded-index multi-mode fiber link whose output is divided into two ports by a mode-dependent optical coupler, is used as mode-division multiplexing network. Its channel matrix is obtained by using MIMO processing technologies. Amplitudes and phases of the data are adjusted according to the channel matrix. The data is successfully switched to the desired port. Also, wavelength independences are clarified.

关键词： Mode-division multiplexing multi-input multi-output Beam-forming Sub-carrier multiplexing

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A Decoupling Network for Resonant and Non-Resonant Sub-1 GHz MIMO Mobile Terminal Antennas With Improved Compactness and Efficiency

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IEEE ACCESS 2021年 9卷 59475-59485页

作者： Cheor, Wai Loon Al-Hadi, Azremi Abdullah Soh, Ping Jack Jamlos, Mohd Faizal Elshirkasi, Ahmed Mohamed Chen, Xiaoming Akkaraekthalin, Prayoot Univ Malaysia Perlis Fac Elect Engn Technol Adv Commun Engn ACE Ctr Excellence Arau 02600 Malaysia Univ Malaysia Pahang Fac Mech & Mfg Engn Pekan 26600 Malaysia Xi An Jiao Tong Univ Sch Informat & Commun Engn Fac Elect & Informat Engn Xian 710049 Peoples R China King Mongkuts Univ Technol North Bangkok KMUTNB Dept Elect & Comp Engn Fac Engn Bangkok 10800 Thailand

In this work, the design procedure of a new decoupling network for different antennas is presented for mobile terminals operating in the Sub-1 GHz band (from 0.698 to 0.96 GHz). To evaluate its applicability for different resonant and non-resonant antenna types, two antenna elements have been chosen to be decoupled using the proposed decoupling network: a printed inverted-F antenna and a capacitive coupling element antenna. Simulation and measurement results showed that the decoupling network offer promising improvements in terms of impedance matching, port isolation, envelope correlation coefficient (ECC), and total efficiency. In addition, the antennas are also investigated with the ergodic capacity, multiplexing efficiency, gain, and diversity gain (both calculated using maximal ratio combining technique). Due to the contribution of the decoupling network, the ECC of both types of multiple antennas are less than 0.3, with a 30 % improvement in total efficiency and an inter-element spacing miniaturization of 34 %.

关键词： Antennas MIMO communication Mobile antennas Capacitors Antenna accessories Measurement Couplings Decoupling networks mutual coupling multi-input multi-output low frequency mobile terminal antennas

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A new approach to the design of coordinated road departure avoidance systems

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART K-JOURNAL OF multi-BODY DYNAMICS 2012年第K1期226卷 45-60页

作者： Alirezaei, M. Corno, M. Ghaffari, A. Kazemi, R. KN Toosi Univ Dept Mech Engn Tehran Iran Tech Univ Delft TUDelft Delft Ctr Syst & Control Mech Maritime & Mat Engn Delft Netherlands

In this article, a multi-input multi-output (MIMO) robust road departure avoidance system based on a closed-loop driver decision estimator (DDE) is presented. The main idea is that of incorporating the driver intent in the control of the vehicle. The driver decision estimator computes the vehicle look ahead lateral position based on driver input and uses this position to establish the risk of road departure. The MIMO controller uses the vehicle lateral position at the look ahead distance and yaw rate to calculate both the front steering angle and differential braking as the control efforts. The DDE ensures that the vehicle remains within the road borders without altering the vehicle response when the driver steers the vehicle back. It is shown that the use of both active steering and differential braking can stabilize the vehicle with shorter look ahead distances compared to the use of only steering. Numerical simulations show the effectiveness and robustness of the proposed approach in comparison with the generalization of other available methods.

关键词： road departure avoidance driver decision estimator multi-input multi-output robust controller

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Reduction of PAPR Without Side Information for SFBC MIMO-OFDM Systems

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IEEE TRANSACTIONS ON BROADCASTING 2019年第2期65卷 316-325页

作者： Hu, Wei-Wen Huang, Wan-Jen Ciou, Ying-Chi Li, Chih-Peng Southern Taiwan Univ Sci & Technol Dept Elect Engn Tainan 710 Taiwan Natl Sun Yat Sen Univ Inst Commun Engn Kaohsiung 804 Taiwan Natl Sun Yat Sen Univ Dept Elect Engn Kaohsiung 804 Taiwan

A novel peak-to-average power ratio (PAPR) reduction scheme designated as extended selected mapping (eSLM) is proposed for space-frequency block coding (SFBC) multi-input multi-output orthogonal frequency division multiplexing systems. In the eSLM method, extension matrices comprising amplitude extensions and phase rotations are constructed to indicate the selected signal index without the need for side information and to minimize the PAPR, respectively. To reduce the computational complexity incurred by the inverse discrete Fourier transform operation in generating the candidate signals, a low-complexity eSLM scheme (LC-eSLM) is developed by constructing equivalent candidate signals in the time domain. Notably, the extension matrices in both schemes preserve the orthogonality of the SFBC code, thereby facilitating low-complexity decoding. The simulation results show that the proposed eSLM scheme not only outperforms existing blind SLM-based methods. Compared with the costly ordinary SLM scheme, the eSLM scheme has a lower computational complexity with a performance loss of less than 0.3 dB and requires no side information. Furthermore, the computational complexity of the LC-eSLM scheme is around 40%-50% lower than that of the eSLM scheme with only a marginal degradation in the PAPR reduction performance.

关键词： Peak-to-average power ratio SFBC multi-input multi-output blind detection

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Performance enhancement based on machine learning scheme for space multiplexing 2x2 MIMO VLC system employing joint IQ independent component analysis

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OPTICS COMMUNICATIONS 2020年 458卷 124733-000页

作者： Wang, Zhe Han, Siqi Chi, Nan Fudan Univ Dept Commun Sci & Engn Key Lab Electromagnet Wave Informat Sci Shanghai Peoples R China

With the increasing demand for Visible Light Communication (VLC) bandwidth, the space-multiplexing technique has been widely utilized to enhance the capability of the VLC system. In this paper, we proposed a novel MIMO detection scheme to decompose the superposed signals in a 2x2 multiple-input-multiple-output (MIMO) VLC system. With the help of the proposed machine learning scheme, two received optical signals can be separated into two independent parallel signals. By simulation, the unmixing matrix can be quickly converged by iterations. Extensive experiments demonstrate an average BER of 6.191x10(-4) is achieved at a bitrate of 750 Mbps over a 1.3-m line of sight (LOS) in the 2x2 MIMO scenario. Finally, to evaluate the performance of the algorithm, the Q factor yielded a gain of about 2.5 dB compared with the traditional Alamouti Space-Time Block Coding (STBC) scheme.

关键词： Joint IQ independent component analysis multi-input multi-output Blind source separation Visible light communication

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MIMO-OFDM Transceivers With Dual-Polarized Division multiplexing and Diversity for multimedia Broadcasting Services

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IEEE TRANSACTIONS ON BROADCASTING 2013年第1期59卷 174-182页

作者： Han, Jae-Shin Baek, Jong-Seob Seo, Jong-Soo Yonsei Univ Dept Elect & Elect Engn Seoul 120749 South Korea LG Elect Team Adv Technol & Syst Convergence Lab CTO Seoul 137130 South Korea

This brief paper presents multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) systems with dual-polarized division multiplexing (PDM) and diversity for multimedia broadcasting services. In particular, the polarized diversity is realized by transmitting two independent and distributed space-frequency coded signals through two sets of dual-polarized transmit antennas. In the corresponding polarized receptions, MIMO zero-forcing (ZF) detection and ZF detection combined with a group-wise or a symbol-wise successive cancelation (SIC) are used to minimize a depolarization effect caused by a cross-polarization discrimination (XPD). Furthermore, we analyze the output signal-to-interference-plus-noise ratio (SINR) of such MIMO detections in terms of the XPD effect. It is shown that the output SINR of MIMO ZF detection increases as the absolute XPD value increases. It is also shown that the output SINR of ZF-SIC detection converges to that of ZF detection as the absolute XPD value increases. Finally, we compare the performances of uni-polarized and dual-polarized MIMO-OFDM systems over a multipath Rician channel with XPD. From simulation results, we conclude that as the absolute XPD value increases, the polarized MIMO-OFDM systems provide a lower symbol error rate than uni-polarized MIMO-OFDM systems.

关键词： Cross-polarization discrimination multi-input multi-output polarized diversity polarized division multiplexing

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