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IEEE COMMUNICATIONS SURVEYS AND TUTORIALS 2015年第1期17卷 106-124页

作者： Berger, Lars T. Schwager, Andreas Pagani, Pascal Schneider, Daniel M. Kenus Informat Paterna 46980 Spain Sony Stuttgart Technol Ctr D-70327 Stuttgart Germany Inst Mines Telecom UMR CNRS Lab STICC 6285 Telecom Bretagne Microwave Dept F-29238 Brest France

Despite being a well-established ingredient to many wireless systems, multiple-input-multiple-output (MIMO) signal processing has only recently been considered for broadband power line communications (PLC). Adapting multiple-antenna transmission and reception techniques to a wired medium such as the electrical grid requires solving a number of issues, both regarding the physics of electromagnetic transmission and the optimization of the signal processing strategies. In the last few years, significant steps were made to demonstrate the benefits of MIMO PLC and to develop the necessary hardware. As a result, MIMO PLC has been adopted in several broadband PLC specifications, precisely as part of ITU-T *** in Recommendation G.9963, and as part of the industry specification HomePlug AV2, which is backward compatible to IEEE 1901. This paper reviews important aspects of MIMO PLC, highlighting its similarities and main differences with classical wireless MIMO. It focuses first on the peculiarities of the electrical grid, with a survey of PLC channel and noise characterization in a MIMO context. It further estimates MIMO PLC channel capacity adhering to the electromagnetic compatibility regulations currently in force. In addition, MIMO signal processing techniques most suited to PLC environments are discussed, allowing for throughput predictions. It is found that eigenbeam-forming is the best choice for MIMO PLC: the full spatial diversity gain is achieved for highly attenuated channels, and maximum multiplexing gain is achieved for channels with low attenuation by utilizing all spatial streams. It is shown that upgrading from a conventional single-input-single-output PLC configuration to a 2 x 2 MIMO configuration, the throughput can be more than doubled while coverage is increased. The survey concludes with a review of specific MIMO PLC system implementations in the specifications ITU-T G.9963 and HomePlug AV2.

关键词： MIMO PLC survey power line communications multiple-input multiple-output ITU-TG.hn G.9963 HomePlug AV2 IEEE 1901

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VLSI implementation of MIMO detection for 802.11n using a novel adaptive tree search algorithm

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Journal of Semiconductors 2013年第10期34卷 107-113页

作者：尧横鉴海防周立国石寅 Institute of Semiconductors Chinese Academy of Sciences

A 4×4 64-QAM multiple-input multiple-output （MIMO） detector is presented for the application of an IEEE 802.1 In wireless local area network. The detector is the implementation of a novel adaptive tree search （ATS） algorithm, and multiple ATS cores need to be instantiated to achieve the wideband requirement in the 802.11 n standard. Both the ATS algorithm and the architectural considerations are explained. The latency of the detector is 0.75 μs, and the detector has a gate count of 848 k with a total of 19 parallel ATS cores. Each ATS core runs at 67 MHz. Measurement results show that compared with the floating-point ATS algorithm, the fixed-point imple- mentation achieves a loss of 0.9 dB at a BER of 10^-3.

关键词： multiple-input multiple-output adaptive tree search sphere decoder fixed complexity sphere decoder 802.11n

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A Novel Second-Order Perturbation Technique for Improving the Signal Processing in MIMO-NOMA Based Cognitive Radio Networks

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WIRELESS PERSONAL COMMUNICATIONS 2022年第1期124卷 293-314页

作者： Magdalene, A. Hyils Sharon Thulasimani, L. PSN Coll Engn & Technol Dept Comp Sci & Engn Tirunelveli 627152 Tamil Nadu India PSG Coll Technol Dept Elect & Commun Engn Coimbatore 641004 Tamil Nadu India

In fifth generation (5G) wireless communication system of non-orthogonal multiple-access (NOMA) and cognitive radio network (CRN), it's an exclusive path for cognitive users (CUs). In this paper, three distinct techniques along with a Novel second-order perturbation analysis method are applied to overcome the interference between the cells during a data exchanges. The interference may happen due to the imperfect sensing of the spectrum by the secondary users (SUs). In the CR approach, the SU access the primary user (PU) channel and concurrently, the PU may return to their channel before the end of SU access. Hence the concurrent way of approaching the PU channel causes collision between the users. This causes interference. Finally, the effect of this interference is highly degraded by the novel second-order perturbation technique and is shown in simulation result that demonstrates the performances of the enhanced approach.

关键词： Cognitive radio network multiple-input multiple-output Non-orthogonal multiple-access Fifth generation wireless communication system

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Atmospheric turbulence mitigation using spatial mode multiplexing and modified pulse position modulation in hybrid RF/FSO orbital-angular-momentum multiplexed based on MIMO wireless communications system

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OPTICS COMMUNICATIONS 2019年 436卷 197-208页

作者： Yousif, Bedir B. Elsayed, Ebrahim Eld Alzalabani, Mahmoud M. Kafrelsheikh Univ Fac Engn Elect & Commun Engn Dept Kafrelsheikh 35514 Egypt Mansoura Univ Fac Engn Elect & Commun Engn Dept Mansoura 35516 Egypt

In this paper, the capacity of a free-space optical (FSO) communication over radio frequency (RF) could potentially be increased by the simultaneous transmission of multiple orbital angular momentum (OAM) based on spatial mode multiplexing (SMM) as an additional effective degree of freedom (EDOF) and quadrature amplitude modulation (QAM). This paper describes using hybrid RF/FSO-OAM based on multiple-input multiple-output (MIMO)/SMM using M-ary modified pulse position modulation (MPPM) and spatial PPM (SPPM) for potentially enhancing capacity in wireless communication systems. We present an analytical system design concerning OAM multiplexing and MIMO/SMM processing in free space communications channel under atmospheric turbulence (AT). Here, we assume a new architecture that closes the gap in speeds between millimeter-wave (mm-wave) wireless and optical links. In this study, we highlight recent advances in the use of OAM multiplexing for highcapacity FSO and mm-wave communications. We have developed the MPPM in FSO communication over RF using the source Gaussian model and SMM by proposing a new version of hybrid SPPM and MPPM. The novelty approach presents performance enhancement of the acquisition, pointing, tracking position and AT mitigation of link. We propose to use SMM combined with OAM-QAM based MIMO communications system to mitigate both weak and strong turbulence distortions. Simulation results show that the capacity of OAM-based MIMO system outperforms the capacity of the conventional MIMO system when the propagation distance is larger than a specific threshold. The use of transmitter lenses could enhance the OAM beams with a larger mode spacing (MS) of 2 (OAM l = +1, l = +3, l = +5, l = +7 transmitted) shows a lower power penalty (PP) when the inter-channel crosstalk overwhelms a larger lateral displacement of about 2 mm. Using the lenses at the transmitter to focus OAM beams could reduce power loss and PP in OAM-based FSO links and that this improvement

关键词： Free space optical communications Millimeter-wave communications Orbital angular momentum multiple-input multiple-output Modified pulse position modulation Spatial mode multiplexing

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Noisy-Interference Sum-Rate Capacity for Vector Gaussian Interference Channels

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IEEE TRANSACTIONS ON INFORMATION THEORY 2013年第1期59卷 132-153页

作者： Shang, Xiaohu Poor, H. Vincent Alcatel Lucent Bell Labs Holmdel NJ 07733 USA Princeton Univ Dept Elect Engn Princeton NJ 08544 USA

New sufficient conditions for a vector Gaussian interference channel to achieve the sum-rate capacity by treating interference as noise are derived, which generalize and extend the existing results. More concise condi... 详细信息

关键词： Capacity interference multiple-input multiple-output

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A Reliable Singular Value Decomposition and Geometric Mean Decomposition Based Precoding Scheme for MU-MIMO-VLC System

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IEEE ACCESS 2022年 10卷 117353-117361页

作者： Qiu, Wenduo Feng, Yan Zhang, You Tibet Univ Sch Informat Sci & Technol Lhasa 850000 Peoples R China

In this paper, in order to improve the reliability of Multi-User multiple-input multiple-output Visible Light Communication (MU-MIMO-VLC) system, we propose a precoding scheme that based on Singular Value Decomposition (SVD) and Geometric Mean Decomposition (GMD) assisted Orthogonal Transformation (OT). In this design, we use SVD to conduct the decomposition of the user's complementary channel matrix. Then, the equivalent channel matrix is obtained by multiplying the user's channel matrix and the decomposed component. After that, the GMD is carried out to decompose the equivalent channel matrix. Finally, the precoding matrix of the proposed scheme is obtained. We then derive the theoretical Symbol Error Rate (SER) of the proposed scheme. The simulation results are provided to validate the effectiveness of the proposed scheme, and to demonstrate that the reliability of the proposed design is superior to benchmark schemes.

关键词： multiple-input multiple-output multi-user visible light communication singular value decomposition geometric mean decomposition reliability

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Degrees of Freedom of Two-Cluster MIMO Multiway Relay Interference Channels Using Blind Interference Neutralization

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KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS 2016年第1期10卷 168-186页

作者： Zhang, Bowei Feng, Wenjiang Dong, Tingting Deng, Yina Chongqing Univ Coll Commun Engn Chongqing 400044 Peoples R China

In this paper, we investigate the degrees of freedom (DoF) of a two-cluster multiple-input multiple-output (MIMO) multiway relay interference channel (mRIC), where there are two relays and two users per cluster. In this channel, users within the same cluster exchange messages among themselves with the help of two relays. We first obtain the DoF upper bound of the considered MIMO mRIC based on cut-set bound. Then, we propose a novel transmission strategy, blind interference neutralization (BIN), to approach the DoF upper bound. This new method utilizes the overheard information at two relays and focuses on the beamforming matrix designs at two relays so that the channel state information (CSI) at users is not required. Through theoretical analysis and numerical simulations, we show that the DoF upper bound can be obtained by using the BIN scheme. From simulation results, we show that the proposed BIN scheme can provide significant performance gain over the conventional time division multiple access (TDMA) scheme in terms of DoF. In addition, we show that the BIN scheme is a superior approach to the existing signal space alignment (SSA) schemes for the considered mRIC.

关键词： multiway relay interference channel degrees of freedom multiple-input multiple-output interference neutralization signal space alignment

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Low-complexity adaptive tracking control of MIMO nonlinear systems with unknown control directions

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INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL 2019年第7期29卷 2203-2222页

作者： Zhang, Jin-Xi Yang, Guang-Hong Northeastern Univ Coll Informat Sci & Engn Shenyang 110819 Liaoning Peoples R China Northeastern Univ State Key Lab Synthet Automat Proc Ind Shenyang 110819 Liaoning Peoples R China

This paper is concerned with the tracking control problem for a class of multiple-input-multiple-output systems with unmatched disturbances and the unknown additive and multiplicative nonlinearities. The objective is to provide a low-complexity control solution in the sense that (i) approximating structures are not involved, despite unknown nonlinearities and (ii) iterative calculations of command derivatives are avoided in the backstepping design. A robust adaptive control strategy is proposed to fulfill the task. In the control design, a new-type adaptive law is first developed to update Nussbaum gains to handle control direction uncertainties, while ensuring Nussbaum gains bounded. Then, the potential robustness of error constraint techniques is exploited to counteract the effects of unknown nonlinearities and disturbances and achieve predefined transient and steady-state tracking performance. Finally, simulation results are given to illustrate the above theoretical findings.

关键词： adaptive control low-complexity multiple-input multiple-output nonlinear systems unknown control directions

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Non-coherent MIMO Communication Systems Employing per Transmit Antenna Differential Mapping (PADM)

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IEICE TRANSACTIONS ON COMMUNICATIONS 2012年第10期E95B卷 3242-3251页

作者： Kubo, Hiroshi Higashinaka, Masatsugu Okazaki, Akihiro Mitsubishi Electr Corp Kamakura Kanagawa 2478501 Japan

This paper proposes non-coherent multiple-input multiple-output (MIMO) communication systems employing per transmit antenna differential mapping (PADM), which generates an independent differentially encoded sequence for each of the multiple transmit antennas by means of space-time coding and mapping. At a receiver, the proposed PADM employs adaptive maximum-likelihood detection (MLD). The features of PADM are as follows: I) it has excellent tracking performance for fast time-varying fading channels, because it can detect transmitted data without needing channel state information (CSI);2) it can be applied not only to transmit diversity (TD) but also to spatial multiplexing (SM). In this paper, we analyze the adaptive MLD based on pseudo matrix inversion and derive its metric for data detection. In order to satisfy requirements on multiple transmitted sequences for the adaptive MLD, this paper proposes a mapping rule for PADM. Next, this paper describes a receiver structure based on per-survivor processing (PSP), which can drastically reduce the complexity of adaptive MLD. Finally, computer simulations confirm that the proposed non-coherent MIMO communication systems employing PADM have excellent tracking capability for TD and SM on fast time-varying fading channels.

关键词： multiple-input multiple-output transmit diversity spatial multiplexing differential space-time signal processing maximum-likelihood detection Viterbi detection

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Transmit Antenna Number Identification for MIMO Cognitive Radio Systems in the Presence of Alpha-Stable Noise

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IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY 2022年第3期71卷 2798-2808页

作者： Zhang, Junlin Zhao, Nan Liu, Mingqian Chen, Yunfei Gong, Fengkui Yang, Qinghai Yu, F. Richard Xidian Univ State Key Lab Integrated Serv Networks Xian 710071 Shaanxi Peoples R China Xidian Univ Collaborat Innovat Ctr Informat Sensing & Underst Xian 710071 Shaanxi Peoples R China Dalian Univ Technol Sch Informat & Commun Engn Dalian 116024 Peoples R China Univ Warwick Sch Engn Coventry CV4 7AL W Midlands England Carleton Univ Dept Syst & Comp Engn Ottawa ON K1S 5B6 Canada

Identification of communication parameters, a major task of intelligent receivers, has important applications in intelligent systems, especially cognitive radio systems. multiple antennas make the identification problem more challenging. In this paper, we focus on the problem of detecting the number of transmit antennas in multiple-input multiple-output (MIMO) cognitive radio systems. A novel identification algorithm is proposed to determine the number of transmit antennas for MIMO systems in the presence of alpha-stable noise. We first introduce the correlation matrix based on the fractional lower order statistics (FLOS) and provide a particular structure of FLOS-based correlation matrix. Then, the eigenvalues of the FLOS-based correlation matrix are employed to construct a test statistic and the central limit theorem is exploited to obtain the decision threshold. Finally, the transmit-antenna number is detected using a serial binary hypothesis test. Simulation results are demonstrated to evaluate the effectiveness of the proposed transmit-antenna number detection algorithm for MIMO systems in the presence of alpha-stable noise.

关键词： Transmitting antennas MIMO communication Correlation Receiving antennas Eigenvalues and eigenfunctions Testing Symmetric matrices Alpha-stable noise fractional lower order statistics multiple-input multiple-output parameter identification

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