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Spherical Harmonic Expansion of Fisher-Bingham Distribution and 3-D Spatial Fading Correlation for multiple-Antenna Systems

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2016年第7期65卷 5695-5700页

作者： Alem, Yibeltal F. Khalid, Zubair Kennedy, Rodney A. Australian Natl Univ Coll Engn & Comp Sci Res Sch Engn Canberra ACT 2601 Australia Lahore Univ Management Sci Syed Babar Ali Sch Sci & Engn Dept Elect Engn Lahore 54792 Pakistan

This paper considers the 3-D spatial fading correlation (SFC) resulting from an angle-of-arrival (AoA) distribution that can be modeled by a mixture of Fisher-Bingham distributions (FB-distributions) on the sphere. By deriving a closed-form expression for the spherical harmonic transform for the component FB-distributions, with arbitrary parameter values, we obtain a closed-form expression of the 3-D SFC for the mixture case. The 3-D SFC expression is general and can be used in arbitrary multiantenna array geometries and is demonstrated for the cases of a 2-D uniform circular array (UCA) and a 3-D regular dodecahedron array (RDA). In computational aspects, we use recursions to compute the spherical harmonic coefficients and give pragmatic guidelines on the truncation size in the series representations to yield machine precision accuracy results. The results are further corroborated through numerical experiments to demonstrate that the closed-form expressions yield the same results as significantly more computationally expensive numerical integration methods.

关键词： Angle of arrival (AoA) Fisher-Bingham distribution (FB-distribution) multiple-input multiple-output spatial correlation spherical harmonic expansion

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Sub-System SVD Hybrid Beamforming Design for Millimeter Wave Multi-Carrier Systems

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2019年第1期18卷 518-531页

作者： Tsai, Tzung-Hua Chiu, Mao-Ching Chao, Chi-chao Realtek Semicond Corp Hsinchu 30076 Taiwan Natl Chung Cheng Univ Dept Commun Engn Dept Elect Engn Chiayi 621 Taiwan Natl Chung Cheng Univ Ctr Telecommun Res Chiayi 621 Taiwan Natl Tsing Hua Univ Inst Commun Engn Hsinchu 30013 Taiwan

In this paper, the hybrid beamforming design for multiple-input multiple-output orthogonal frequency-division multiplexing systems is studied over the indoor millimeter wave (mm-wave) channels. Under practical hybrid beamforming constraints for multi-carrier systems and the study of sub-systems, we propose the sub-system SVD (SS) hybrid beamforming design. To alleviate the complexity problem of channel estimation, reduction of the amount of the required channel state information (CSI) is also studied based on the statistical properties of indoor mm-wave channels. The SS hybrid beamforming algorithm is then extended to the limited feedback SS (LSS) scheme in which the transmit beamformers are designed based on limited information fed back from the receiver. A fast codeword selection algorithm is also developed to reduce the search complexity of the LSS algorithm. The simulation results show that our SS algorithm achieves the performance level of traditional full-digital beamforming with low complexity and the LSS algorithm has better performance and lower complexity than the previous algorithm, even if the amount of CSI is greatly reduced.

关键词： Millimeter wave communication hybrid beamforming multiple-input multiple-output antenna array

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Real-Time Demonstration of 100 GbE THz-Wireless and Fiber Seamless Integration Networks

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JOURNAL OF LIGHTWAVE TECHNOLOGY 2023年第4期41卷 1129-1138页

作者： Zhang, Jiao Zhu, Min Hua, Bingchang Lei, Mingzheng Cai, Yuancheng Zou, Yucong Tong, Weidong Ding, Junjie Tian, Liang Ma, Like Xiao, Jinbiao Huang, Yongming Yu, Jianjun You, Xiaohu Southeast Univ Natl Mobile Commun Res Lab Nanjing 210096 Peoples R China Purple Mt Labs Nanjing 211111 Peoples R China Fudan Univ Shanghai 200433 Peoples R China China Mobile Res Inst Beijing 100053 Peoples R China Southeast Univ Sch Elect Sci & Engn Nanjing 210096 Peoples R China

We propose and experimentally demonstrate a real-time fiber-THz-fiber 2 x 2 multiple-input multiple-output (MIMO) seamless integration system at 340-510 GHz using commercial digital coherent optics (DCO) modules for baseband signals processing, which realizes a record net rate of 103.125 Gb/s dual polarization quadrature-phase-shift-keying (DP-QPSK) signals delivery over two spans of 20 km wireline single-mode fiber-link and 3 m wireless 2 x 2 MIMO link without using THz power amplifier under 15% soft-decision forward-error-correction threshold (SD-FEC) of 1.56 x 10(-2). Two kinds of THz-to-optical conversion schemes based on an integrated dual-polarization Mach-Zehnder modulator (DP-MZM) and two discrete intensity-modulators (IMs) are extensively investigated and compared. To the best of our knowledge, this is the first real-time demonstration of THz-wireless and 100 GbE fiber-optic networks seamless integration transmission, which is compatible with IEEE 802.3 and ITU-T G.798 specifications. It is a promising scheme to meet the demands of future fiber-wireless-integrations communication for low power consumption, low cost and miniaturization.

关键词： Optical fiber devices Optical fiber communication Optical fiber polarization Optical fiber amplifiers Wireless communication High-speed optical techniques Optical polarization Digital coherent optics module Fiber-optic networks multiple-input multiple-output Polarization multiplexing Seamless integration Terahertz-band THz-to-optical conversion

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Exploring Coordinated Multipoint Beamforming Strategies for 5G Cellular

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IEEE ACCESS 2014年 2卷 930-946页

作者： Schwarz, Stefan Rupp, Markus Vienna Univ Technol Inst Telecommun A-1040 Vienna Austria

Cellular networks are a central part of today's communication infrastructure. The global roll-out of 4G long-term evolution is underway, ideally enabling ubiquitous broadband Internet access. Mobile network operators, however, are currently facing an exponentially increasing demand for network capacity, necessitating densification of cellular base stations (keywords: small cells and heterogeneous networks) and causing a strongly deteriorated interference environment. Coordination among transmitters and receivers to mitigate and/or exploit interference is hence seen as a main path toward 5G mobile networks. We provide an overview of existing coordinated beamforming strategies for interference mitigation in broadcast and interference channels. To gain insight into their ergodic behavior in terms of signal to interference and noise ratio as well as achievable transmission rate, we focus on a simplified but representative scenario with two transmitters that serve two users. This analysis provides guidelines for selecting the best performing method depending on the particular transmission situation.

关键词： multiple-input multiple-output beamforming multiuser gains coordinated multipoint transmission ergodic transmission rate linear transceivers MMSE receiver

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Over-the-Air Federated Learning Over MIMO Channels: A Sparse-Coded multiplexing Approach

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IEEE Transactions on Wireless Communications 2025年

作者： Zhong, Chenxi Yang, Huiyuan Yuan, Xiaojun University of Electronic Science and Technology of China National Key Laboratory of Wireless Communications Chengdu China

The communication bottleneck of over-the-air federated learning (OA-FL) lies in aggregating the gradients of local learning models. In this paper, we study the reduction of the communication overhead in the gradient aggregation by using the multiple-input multiple-output (MIMO) technique. We propose a novel sparse-coded multiplexing (SCoM) approach that employs sparse-coding compression and MIMO multiplexing to balance the communication overhead and the learning performance of the FL model. We derive an upper bound on the learning performance loss of the SCoM-based MIMO OA-FL scheme by quantitatively characterizing the gradient aggregation error. Based on the analysis results, we show that the optimal number of multiplexed data streams to minimize the upper bound on the FL learning performance loss is given by the minimum of the numbers of transmit and receive antennas. We then formulate an optimization problem for the design of precoding and post-processing matrices to minimize the gradient aggregation error. To solve this problem, we develop an efficient algorithm based on alternating optimization (AO) and Karush-Kuhn-Tucker (KKT) conditions, which effectively mitigates the impact of the gradient aggregation error. Numerical results demonstrate the superb performance of the proposed SCoM approach. © 2002-2012 IEEE.

关键词： multiple-input multiple-output multiplexing Over-the-air federated learning turbo compressed sensing

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Nonbinary ldpc-coded probabilistic shaping scheme for MIMO systems based on signal space diversity

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Digital Communications and Networks 2023年第3期9卷 779-787页

作者： Weimin Kang School of Information and Communication Engineering North University of ChinaTaiyuan030051China

This paper first describes a binary Low-Density Parity-Check(LDPC)-coded Probabilistic Shaping(PS)scheme for multiple-input multiple-output(MIMO)systems based on Signal Space Diversity(SSD).Second,a Nonbinary(NB)LDPC-coded PS scheme for MIMO systems based on SSD is *** first scheme can be used to obtain a shaping gain,whereas the second can also realize a coding *** theoretical average mutual information of the optimized rotated quadrature amplitude modulation constellations is analyzed and the simulated error per-formance with 22 and 44 MIMO schemes is *** theoretical average mutual information analysis and simulation results show that the proposed NB LDPC-coded PS scheme for MIMO systems based on SSD is reliable and robust,and is therefore suitable for future wireless communication systems.

关键词： Probabilistic shaping multiple-input multiple-output Signal space diversity Average mutual information

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Fine-Grained Indoor Localization Using Single Access Point With multiple Antennas

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IEEE SENSORS JOURNAL 2015年第3期15卷 1538-1544页

作者： Wen, Fuxi Liang, Chen Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore Xian Univ Posts & Telecommun Sch Comp Sci & Technol Xian 710121 Peoples R China

We propose a single access point-based fine-grained indoor localization system in multipath environments using 802.11ac Wi-Fi signals. The physical layer of 802.11ac supports orthogonal frequency-division multiplexing modulation (OFDM) scheme, more antennas, and multiuser multiple-input multiple-output. Angle-of-arrival (AOA) of the paths can be obtained using the phase difference among all the antennas. Similarly, time of arrival (TOA) information is estimated from the phase difference among all the subcarriers of the OFDM signal. After obtaining the AOA and TOA information of the dominant paths, an auto paring approach is proposed to identify the line-of-sight (LOS) path. Mobile device can be localized using the estimated AOA and TOA information of the LOS path. Performance analysis of the proposed method is provided. Numerical simulations are carried out to evaluate the performance. Based on the simulation results, meter or submeter level accuracy is obtained for the proposed method.

关键词： Indoor localization fine-grained multiple-input multiple-output angle of arrival time of arrival orthogonal frequency-division multiplexing channel frequency response access point mobile device line-of-sight

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IMRecoNet: Learn to Detect in Index Modulation Aided MIMO Systems With Complex Valued Neural Networks

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2023年第2期72卷 1791-1805页

作者： Zhang, Chenwu Lu, Hancheng Liu, Jinxue Univ Sci & Technol China Sch Informat Sci & Technol CAS Key Lab Wireless Opt Commun Hefei 230027 Peoples R China Univ Sci & Technol China CAS Key Lab Wireless Opt Commun Hefei 230027 Peoples R China Hefei Comprehens Natl Sci Ctr Inst Artificial Intelligence Hefei 230027 Peoples R China

Index modulation (IM) reduces the power consumption and hardware cost of the multiple-input multiple-output (MIMO) system by activating part of the antennas for data transmission. However, IM significantly increases the complexity of the receiver and needs accurate channel estimation to guarantee its performance. To tackle these challenges, in this paper, we design a deep learning (DL) based detector for the IM aided MIMO (IM-MIMO) systems. We first formulate the detection process as a sparse reconstruction problem by utilizing the inherent attributes of IM. Then, based on greedy strategy, we design a DL based detector, called IMRecoNet, to realize this sparse reconstruction process. Different from the general neural networks, we introduce complex value operations to adapt the complex signals in communication systems. To the best of our knowledge, this is the first attempt that introduce complex valued neural network to the design of detector for the IM-MIMO systems. Finally, to verify the adaptability and robustness of the proposed detector, simulations are carried out with consideration of inaccurate channel state information (CSI) and correlated MIMO channels. The simulation results demonstrate that the proposed detector outperforms existing algorithms in terms of antenna recognition accuracy and bit error rate under various scenarios.

关键词： Detectors MIMO communication Wireless communication Complexity theory Receivers Hardware Costs Complex-valued neural network index modu-lation multiple-input multiple-output signal detection sparse reconstruction

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Performance enhancement for indoor visible light communication system with an improved inter-symbol interference model using optimized hemispherical optical-angle-diversity-receivers

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OPTICS COMMUNICATIONS 2020年 454卷 124488-000页

作者： Feng, Jingyuan Yang, Chunyong Hou, Jin Long, Hao Chen, Shaoping South Cent Univ Nationalities Hubei Key Lab Intelligent Wireless Commun Coll Elect & Informat Engn Wuhan 430074 Hubei Peoples R China

Several hemispherical optical receivers based on angle diversity technology are optimized to achieve better reception for multiple-input multiple-output (MIMO) visible light communication (VLC) system with an improved inter-symbol interference (ISI) model. The optimal parameters are obtained via analyzing the performances under different diversity dimensions, spatial distances between adjacent photodiodes (PDs) and inclination angles. The simulation results reveal that under the condition of optical angle diversity receiver (OADR) with 4 PDs, the optimal spatial distance between adjacent PDs is 0.1 m and the inclination angle is 50 degrees, respectively. Compared with common plane model of 4 PDs, the average SNR has increased by 15.2%. It is no doubt that the OADR is a kind of promising alternative for indoor visible light communications.

关键词： Visible light communication multiple-input multiple-output Angle diversity receiver Inter-symbol interference

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Space-Time-Range Adaptive Processing for Airborne Radar Systems

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IEEE SENSORS JOURNAL 2015年第3期15卷 1602-1610页

作者： Xu, Jingwei Zhu, Shengqi Liao, Guisheng Xidian Univ Natl Lab Radar Signal Proc Xian 710071 Peoples R China

Conventional phased-array space-time adaptive processing (STAP) radar combines angle and Doppler domains to realize clutter suppression. However, it suffers from severe performance degradation in electronic countermeasures scenarios, especially in the presence of mainbeam deceptive jamming. In this paper, a multiple-input multiple-output (MIMO) STAP radar is studied with a frequency diverse array (FDA) acting as the transmit array, which is referred to as FDA-MIMO STAP radar. FDA can provide controllable degrees of freedom in both range and angle domains. As a result, in FDA-MIMO STAP radar, the target can be discriminated from the clutter and jamming in joint range-angle-Doppler domains. By combining the range, angle and Doppler domains in FDA-MIMO STAP radar, a space-time-range adaptive processing method is proposed based on subspace projection technique. Simulation results demonstrate the effectiveness of the proposed approach in suppressing the clutter and jamming.

关键词： Space-time adaptive processing mainbeam deceptive jamming frequency diverse array multiple-input multiple-output range-angle-dependent

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