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

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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A Differential MIMO SC-FDE Transceiver Design over Multipath Fast Fading Channels

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IEICE TRANSACTIONS ON COMMUNICATIONS 2010年第7期E93B卷 1939-1942页

作者： Deng, Juinn-Horng Hwang, Jeng-Kuang Yuan Ze Univ Dept Commun Engn Chungli 32003 Taiwan

In this paper, we propose a new differential MIMO single-carrier system with frequency-domain equalization (SC-FDE) aided by the insertion of cyclic prefix. This block transmission system not only inherits all the merits of the SISO SC-FDE system, but is also equipped with a differential space-time block coding (DSTBC) such as to combat the fast-changing frequency selective fading channels without the needs to estimate and then compensate the channel effects. Hence, for practical applications, it has the additional merits of decoding simplicity and robustness against high mobility transmission environments. Computer simulations show that the proposed system can provide diversity benefit as the non-differential system does, while greatly reducing the receiver complexity.

关键词： single-carrier frequency domain equalization multiple-input multiple-output differential detection

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A Low Complexity Modulation Classification Algorithm for MIMO Systems

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IEEE COMMUNICATIONS LETTERS 2013年第10期17卷 1881-1884页

作者： Muehlhaus, Michael S. Oner, Menguc Dobre, Octavia A. Jondral, Friedrich K. Karlsruhe Inst Technol D-76021 Karlsruhe Germany Mem Univ St Johns St John NF Canada Isik Univ Sile Turkey

A novel algorithm is proposed for automatic modulation classification in multiple-input multiple-output spatial multiplexing systems, which employs fourth-order cumulants of the estimated transmit signal streams as discriminating features and a likelihood ratio test (LRT) for decision making. The asymptotic likelihood function of the estimated feature vector is analytically derived and used with the LRT. Hence, the algorithm can be considered as asymptotically optimal for the employed feature vector when the channel matrix and noise variance are known. Both the case with perfect channel knowledge and the practically more relevant case with blind channel estimation are considered. The results show that the proposed algorithm provides a good classification performance while exhibiting a significantly lower computational complexity when compared with conventional algorithms.

关键词： Automatic modulation classification multiple-input multiple-output fourth-order cumulant

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NOMA With Zero-Forcing V-BLAST

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IEEE COMMUNICATIONS LETTERS 2020年第9期24卷 2070-2074页

作者： Ozyurt, Serdar Simon, Eric Pierre Farah, Joumana Ankara Yildirim Beyazit Univ Dept Elect & Elect Engn TR-06010 Ankara Turkey Univ Lille F-59650 Villeneuve Dascq France IEMN Lab F-59650 Villeneuve Dascq France Lebanese Univ Fac Engn Dept Elect & Elect Beirut 1000 Lebanon

In this study, power-domain non-orthogonal multiple access (NOMA) is combined with zero-forcing (ZF) vertical Bell Labs layered space-time (V-BLAST) technique. Motivated by the fact that the successive interference cancellation (SIC) is a pivotal element in either technique, we thoroughly investigate the impact of SIC on inter-user and inter-layer interference. A two-user downlink scenario is investigated where a multi-antenna base station with no instantaneous channel state information simultaneously communicates with two users each with multiple antennas. The average sum rate of the considered system is analytically derived in an exact form. Correspondingly, the power allocation value on each substream is optimized such that the average sum rate is maximized. We show that when the classical power-domain NOMA idea is incorporated into the ZF V-BLAST algorithm, the far user cannot completely cancel inter-layer interference. Nonetheless, the proposed approach turns out to yield an average sum rate performance near to that of a higher-complexity method based on maximum likelihood detection.

关键词： NOMA Silicon carbide Interference Resource management Antennas Downlink Channel state information multiple-input multiple-output non-orthogonal multiple access zero-forcing V-BLAST average sum rate

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Low-Mutual-Coupling 60-GHz MIMO Antenna System With Frequency Selective Surface Wall

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IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2017年 16卷 373-376页

作者： Karimian, Reza Kesavan, Arun Nedil, Mourad Denidni, Tayeb A. Univ Quebec Inst Natl Rech Sci Montreal PQ H5A 1K6 Canada Univ Quebec Abitibi Temiscamingue Rouyn Noranda PQ J9X 5E4 Canada

A new dielectric resonator antenna (DRA) for a millimeter-wave (mm-wave) multiple-input multiple-output system is presented. Two approaches are exploited to reduce the mutual coupling between two antenna elements. First, a frequency selective surface (FSS) wall is inserted between the DRAs to reduce the free-space radiation. Then, two slots with different size acting like an LC resonator are etched from the common ground plane of the structure to reduce the surface current. The designed FSS has a wideband characteristic from 40 to 70 CHz. The FSS is optimized for the desired frequency of 57-63 CHz. A high isolation of 30 dB is achieved when both FSS wall and slots are used. A prototype of the structure is fabricated and measured. The results give a low correlation coefficient (<5e-6) and a good agreement with simulation ones, indicating that the proposed antenna can provide spatial or pattern diversity to increase the data capacity of wireless communication systems at mm-wave bands.

关键词： Dielectric resonator antenna (DRA) free-space coupling frequency selective surface (FSS) multiple-input multiple-output mutual coupling

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Dual-Hop MIMO Amplify-and-Forward Relay Channel Capacity with Keyhole Effect

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IEEE COMMUNICATIONS LETTERS 2011年第10期15卷 1050-1052页

作者： Firag, Abdulla Suraweera, Himal A. Smith, Peter J. Yuen, Chau Univ Canterbury Dept Elect & Comp Engn Christchurch 1 New Zealand Singapore Univ Technol & Design Singapore Singapore

Keyhole fading present in some relay based applications can degrade the system performance. In this paper, we investigate the effect of multi-keyhole fading on the ergodic capacity of fixed infrastructure based multiple-input multiple-output (MIMO) amplify-and-forward (AF) relaying systems. Specifically, considering a Rayleigh-multi-keyhole MIMO AF relay channel, we derive an expression for the system's ergodic capacity. Our capacity expression is valid for arbitrary number of antennas, number of keyholes, keyhole power distribution and all signal-to-noise ratio values.

关键词： Relay systems multiple-input multiple-output capacity keyhole

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Capacity analysis of MIMO MRC systems in correlated rayleigh fading environments

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WIRELESS PERSONAL COMMUNICATIONS 2007年第4期43卷 1569-1576页

作者： Rui, Xianyi Jin, Rongliong Geng, Junping Shanghai Jiao Tong Univ Sch Elect Informat & Elect Engn Dept Elect Engn Shanghai 200240 Peoples R China

In this paper, we analyze the capacity of multiple-input multiple-output systems employing maximal ratio combining under Rayleigh fading environments in the presence of spatial fading correlation at the transmitter or receiver. Based on statistical properties of the largest eigenvalue of correlated complex Wishart matrices, the exact closed-form expressions for the cumulative distribution function and the probability density function of the output signal-to-noise ratio are presented. The results are used to analyze the outage and ergodic capacities of the systems. The analysis shows that ergodic capacity improves with the increase of the channel correlation coefficient and the analytical results are validated by Monte Carlo simulations.

关键词： multiple-input multiple-output maximal ratio combining outage capacity ergodic capacity correlated Rayleigh fading

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Deep Learning-Based Sphere Decoding

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2019年第9期18卷 4368-4378页

作者： Mohammadkarimi, Mostafa Mehrabi, Mehrtash Ardakani, Masoud Jing, Yindi Univ Alberta Dept Elect & Comp Engn Edmonton AB T6G 2R3 Canada

In this paper, a deep learning (DL)-based sphere decoding algorithm is proposed, where the radius of the decoding hypersphere is learned by a deep neural network (DNN). The performance achieved by the proposed algorithm is very close to the optimal maximum likelihood decoding (MLD) over a wide range of signal-to-noise ratios (SNRs), while the computational complexity, compared to existing sphere decoding variants, is significantly reduced. This improvement is attributed to the DNN's ability of intelligently learning the radius of the hypersphere used in decoding. The expected complexity of the proposed DL-based algorithm is analytically derived and compared with existing ones. It is shown that the number of lattice points inside the decoding hypersphere drastically reduces in the DL-based algorithm in both the average and worst-case senses. The effectiveness of the proposed algorithm is shown through the simulation for high-dimensional multiple-input multiple-output (MIMO) systems, using high-order modulations.

关键词： Sphere decoding integer least-squares problem maximum likelihood decoding deep learning deep neural network multiple-input multiple-output complexity analysis

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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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Iterative Robust MMSE Receiver for STBC under Channel Information Errors

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IEICE TRANSACTIONS ON COMMUNICATIONS 2016年第10期E99B卷 2228-2235页

作者： Yoo, Namsik Baek, Jong-Hyen Lee, Kyungchun Seoul Natl Univ Sci & Technol Dept Elect & Informat Engn 232 Gongneung Ro Seoul 01811 South Korea Korea Railrd Res Inst Metropolitan Transportat Res Ctr Signaling & Commun Team 176 Cheldobangmulgwan Ro Uiwang Si 06105 Gyeonggi Do South Korea

In this paper, an iterative robust minimum-mean square error (MMSE) receiver for space-time block coding (STBC) is proposed to mitigate the performance degradations caused by channel state information (CSI) errors. The proposed scheme estimates an instantaneous covariance matrix of the effective noise, which includes additive white Gaussian noise and the effect of CSI errors. For this estimation, multiple solution candidate vectors are selected based on the distances between the MMSE estimate of the solution and the constellation points, and their a-posteriori probabilities are utilized to execute the estimation of the covariance matrix. To improve the estimation accuracy, the estimated covariance matrix is updated iteratively. Simulation results show that proposed robust receiver achieves substantial performance gains in terms of bit error rates as compared to conventional receiver schemes under CSI errors.

关键词： multiple-input multiple-output space-time block coding minimum mean square error channel information error

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