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Demonstration of 144-Gbps Photonics-Assisted THz Wireless Transmission at 500 GHz Enabled by Joint DBN Equalizer

MICROMACHINES 2022年第10期13卷 1617-1617页

作者： Liu, Xiang Zhang, Jiao Gao, Shuang Tong, Weidong Wang, Yunwu Lei, Mingzheng Hua, Bingchang Cai, Yuancheng Zou, Yucong Zhu, Min Southeast Univ Natl Mobile Commun Res Lab Nanjing 210096 Peoples R China Purple Mt Labs Nanjing 211111 Peoples R China

The THz wireless transmission system based on photonics has been a promising candidate for further 6G communication, which can provide hundreds of Gbps or even Tbps data capacity. In this paper, 144-Gbps dual polarization quadrature-phase-shift-keying (DP-QPSK) signal generation and transmission over a 20-km SSMF and 3-m wireless 2 x 2 multiple-input multiple-output (MIMO) link at 500 GHz have been demonstrated. To further compensate for the linear and nonlinear distortions during the fiber-wireless transmission, a novel joint Deep Belief Network (J-DBN) equalizer is proposed. Our proposed J-DBN-based schemes are mainly optimized based upon the constant modulus algorithm (CMA) and direct-detection least mean square (DD-LMS) equalization. The results indicate that the J-DBN equalizer has better bit error rate (BER) performance in receiver sensitivity. In addition, the computational complexity of the J-DBN-based equalizer can be approximately 46% lower than that of conventional equalizers with similar performance. To our knowledge, this is the first time that a novel joint DBN equalizer has been proposed based on classical algorithms. It is a promising scheme to meet the demands of future fiber-wireless integration communication for low power consumption, low cost, and high capacity.

关键词： Terahertz-band multiple-input multiple-output polarization multiplexing seamless integration Deep Belief Network

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MIMO OFDM Dual-Function Radar-Communication Under Error Rate and Beampattern Constraints

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2022年第6期40卷 1951-1964页

作者： Johnston, Jeremy Venturino, Luca Grossi, Emanuele Lops, Marco Wang, Xiaodong Columbia Univ Dept Elect Engn New York NY 10027 USA Univ Cassino & Southern Lazio Dept Elect & Informat Engn I-03043 Cassino Italy CNIT I-43124 Parma Italy Univ Naples Federico II Dept Elect & Informat Technol I-80138 Naples Italy

In this work we consider a multiple-input multiple-output (MIMO) dual-function radar-communication (DFRC) system, which senses multiple spatial directions and serves multiple users. Upon resorting to an orthogonal frequency division multiplexing (OFDM) transmission format and a differential phase shift keying (DPSK) modulation, we study the design of the radiated waveforms and of the receive filters employed by the radar and the users. The approach is communication-centric, in the sense that a radar-oriented objective is optimized under constraints on the average transmit power, the power leakage towards specific directions, and the error rate of each user, thus safeguarding the communication quality of service (QoS). We adopt a unified design approach allowing a broad family of radar objectives, including both estimation- and detection-oriented merit functions. We devise a suboptimal solution based on alternating optimization of the involved variables, a convex restriction of the feasible search set, and minorization-maximization, offering a single algorithm for all of the radar merit functions in the considered family. Finally, the performance is inspected through numerical examples.

关键词： Radar OFDM Transmitters Radar antennas Optimization Mutual information Error analysis Dual-function radar-communication integrated sensing and communication orthogonal frequency division multiplexing multiple-input multiple-output waveform design filter design differential phase shift keying

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Performance Comparison of Deep Learning Based Signal Detection and SIC in MIMO - NOMA for 5G Enabled Vehicular Communication 15

Performance Comparison of Deep Learning Based Signal Detecti...

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15th International Conference on Computing Communication and Networking Technologies, ICCCNT 2024

作者： Beena, A.O. Sameer, S.M. Dept. of Electronics Engineering Kottayam India National Institute of Technology Calicut Dept. of Electronics & Communication Engineering Calicut India

ISBN: (纸本)9798350370249

An investigation on the performance of a proposed deep learning (DL)-based signal detection scheme over the traditional successive interference cancellation (SIC) method for multiple-input multiple-output (MIMO) - non-orthogonal multiple access (NOMA) based downlink system for vehicular communication is presented. The proposed scheme is analyzed for a system of two users in a cell experiencing selective frequency Rayleigh fading channels. The DL-based MIMO-NOMA receiver detects signals in a single-step process without explicitly estimating channel state information. The long short-term memory (LSTM) based scheme is proposed to perform joint channel estimation and signal detection. The performance of the proposed DL based detection scheme is compared with the traditional method SIC based on least square (LS) estimation and minimum mean square error (MMSE) estimation. The simulation results show that the proposed DL-based detection is more effective than conventional SIC techniques. Also, it shows better adaptability to variations in cyclic prefix (CP) length and the number of pilot symbols in the frame. It has been observed that even in cases of severe inter-symbol interference (ISI), the proposed DL-based method outperforms the LS and MMSE based conventional SIC detectors. © 2024 IEEE.

关键词： 5G Channel state information Deep Learning Downlink Long Short Term Memory multiple-input multiple-output Non-orthogonal multiple access Successive Interference Cancellation Vehicular communication

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Non-Convex Generalized Nash Games for Energy Efficient Power Allocation and Beamforming in mmWave Networks

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2022年 70卷 3193-3205页

作者： Wang, Wenbo Leshem, Amir Bar Ilan Univ Fac Engn IL-52900 Ramat Gan Israel

Network management is a fundamental ingredient for efficient operation of wireless networks. With increasing bandwidth, number of antennas and number of users, the amount of information required for network management increases significantly. Therefore, distributed network management is a key to efficient operation of future networks. This paper focuses on the problem of distributed joint beamforming control and power allocation in ad-hoc mmWave networks. Over the shared spectrum, a number of multi-input-multi-output links attempt to minimize their supply power by simultaneously finding the locally optimal power allocation and beamformers in a self-organized manner. Our design considers a family of non-convex quality-of-service constraint and utility functions characterized by monotonicity in the strategies of the various users. We propose a two-stage, decentralized optimization scheme, where the adaptation of power levels and beamformer coefficients are iteratively performed by each link. We first prove that given a set of receive beamformers, the power allocation stage converges to an optimal generalized Nash equilibrium of the generalized power allocation game. Then we prove that iterative minimum-mean-square-error adaptation of the receive beamformer results in an overall converging scheme. Several transmit beamforming schemes requiring different levels of information exchange are also compared in the proposed allocation framework. Our simulation results show that allowing each link to optimize its transmit filters using the direct channel results in a near optimum performance with very low computational complexity, even though the problem is highly non-convex.

关键词： Resource management Array signal processing Games Ad hoc networks Quality of service Optimization Interference Beamforming energy-aware networks generalized nash equilibrium multiple-input multiple-output multi-link

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Research on uplink performance of MIMO terrestrial-satellite laser communication based on OSM-MBM joint modulation

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JOURNAL OF MODERN OPTICS 2022年第20期69卷 1149-1158页

作者： Wang, Haibo Wang, Qianqian Wang, Yi Hubei Univ Technol Sch Mech Engn Hubei Key Lab Modern Mfg Qual Engn Wuhan 430068 Peoples R China China JiLiang Univ Coll Informat Engn Key Lab Electromagnet Wave Informat Technol & Metr Hangzhou 310018 Peoples R China

This paper proposes a multiple-input multiple-output (MIMO) terrestrial-satellite laser communication uplink system based on optical spatial modulation with medium-based modulation (OSM-MBM) joint modulation. The Malaga(M) distribution is used to describe the combined effects of near-ground turbulent light intensity scintillation, beam wander and angle of arrival fluctuation. The closed expression of the bit error rate (BER) of the OSM-MBM joint modulation MIMO terrestrial-satellite laser communication uplink is derived. The simulation analyzes the influence of transmitting radius, receiving aperture, beam divergence, zenith angle and signal-to-noise ratio on the system error performance, and compares it with traditional modulation, media-based modulation and optical space modulation. Finally, the experiment is verified by Monte Carlo. This research provides a theoretical reference for the engineering realization of the modulation technology for the MIMO terrestrial-satellite laser communication uplink system.

关键词： Satellite-terrestrial laser communication uplink medium-based modulation (MBM) OSM-MBM joint modulation multiple-input multiple-output optical spatial modulation

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Parameter Estimation in PMCW MIMO Radar Systems With Few-Bit Quantized Observations

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2022年 70卷 810-821页

作者： Wu, Chao-Yi Zhang, Tianyi Li, Jian Wong, Tan F. Univ Florida Dept Elect & Comp Engn Gainesville FL 32611 USA

We consider the problem of target parameter estimation in phase modulated continuous wave (PMCW) multiple-input multiple-output (MIMO) radar systems with quantized observations. We derive the Cramer-Rao bound (CRB) for jointly estimating targets' amplitudes, time delays, Doppler shifts, and directions. The derived bound provides an efficient method to analyze the estimation performance achieved by different quantization schemes. We also devise the maximum likelihood (ML) estimator for the considered parameters, and a direct grid-based method (DGM) is introduced to obtain the ML estimates. To obtain the ML estimates more efficiently, a two-stage scheme is proposed. In the proposed scheme, we first formulate the estimation problem as a sparse signal recovery problem and modify the sparse learning via iterative minimization (SLIM) approach to solve it. Next, a RELAX-based iterative algorithm is proposed to refine the estimates. Simulation results show that the proposed scheme can approach the CRB. Simulation results also show that using quantized observations does not affect the estimation performance significantly when the targets' amplitudes are similar.

关键词： Quantization (signal) Radar Maximum likelihood estimation MIMO radar Radar imaging Standards Sensors Millimeter wave phase modulated continuous wave radar multiple-input multiple-output target parameter estimation sparse signal recovery Cramer-Rao bound

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An Improved SIC-Based Detection Scheme for Non-Uniform Constellations in ATSC 3.0 MIMO

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IEEE TRANSACTIONS ON BROADCASTING 2022年第2期68卷 286-294页

作者： Kim, Hyeongseok Kim, Jeongchang Park, Sung-Ik Hur, Namho Korea Maritime & Ocean Univ Dept Elect & Commun Engn Interdisciplinary Major Maritime AI Convergence Busan 49112 South Korea Elect & Telecommun Res Inst Media Transmiss Res Grp Daejeon 34129 South Korea

This paper presents an alternative approach to real-valued signal representation and proposes an improved successive interference cancellation (SIC)-based detection scheme using the alternative signal representation for non-uniform constellations (NUCs) in Advanced Television Systems Committee (ATSC) 3.0. Since I/Q polarization interleaving in ATSC 3.0 multiple-input multiple-output (MIMO) precoding performs a non-linear operation, it makes it difficult to use conventional suboptimal detection schemes based on interference cancellation. Therefore, the alternative signal representation is designed to easily apply various suboptimal detection schemes. Further, to obtain more robustness and lower complexity, a suboptimal detection scheme based on the alternative signal representation and interference cancellation with QR decomposition is proposed. The proposed detection scheme exploits the structural properties of NUCs and jointly detects the real and imaginary parts as a block. In addition, by considering one or more candidate symbols in the interference cancellation for the proposed detection scheme, the performance and the complexity are trade-offs according to the number of the considering candidate symbols. Simulation results show that the proposed detection scheme with a slight increase of the complexity significantly outperforms a linear detection under fixed and mobile channels.

关键词： MIMO communication Interference cancellation Complexity theory Codes Maximum likelihood decoding Robustness Quadrature amplitude modulation Advanced television systems committee 3 0 multiple-input multiple-output real-valued representation suboptimal decoding successive interference cancellation

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On the Degrees of Freedom Region for Simultaneous Imaging & Uplink Communication

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2022年第6期40卷 1768-1779页

作者： Mehrotra, Nishant Sabharwal, Ashutosh Rice Univ Dept Elect & Comp Engn Houston TX 77005 USA

In this paper, we take the first step towards quantifying the fundamental performance trade-offs between imaging and communication supported simultaneously using the same network resources. We analyze an uplink system configuration with a full-duplex base station (BS) illuminating an imaging scene while receiving data from a communication user. Our main contributions are two-fold. First, we propose a unified signal space analysis framework based on the degrees of freedom metric to characterize the trade-offs between the two operations in the high signal-to-noise ratio regime. Second, we propose a dual-function joint processing scheme, decode-and-image, that allows the BS to simultaneously form an image of the scene while decoding the uplink user's data. Our analysis and proposed scheme highlight the benefits of exploiting the uplink signals for imaging, at the cost of increased cooperation between the BS and uplink user. Moreover, our proposed scheme outperforms traditional schemes that enable dual-function operation via spatial or temporal isolation of imaging and communication signals.

关键词： Imaging Uplink Radar imaging Measurement Lighting Decoding Reflectivity Degrees of freedom joint imaging and communication multiple-input multiple-output wireless imaging

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A Review of Codebooks for CSI Feedback in 5G New Radio and Beyond

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China Communications 2025年第2期22卷 112-127页

作者： Qin Ziao Yin Haifan Air Defense Early Warning Equipment Department of Air Force Early Warning Academy Wuhan 430019China School of Electronic Information and Communications Huazhong University of Science and TechnologyWuhan 430074China

Codebooks have been indispensable for wireless communication standard since the first release of the Long-Term Evolution in *** offer an efficient way to acquire the channel state information(CSI)for multiple antenna ***,a codebook is not limited to a set of pre-defined precoders,it refers to a CSI feedback framework,which is more and more *** this paper,we review the codebooks in 5G New Radio(NR)*** codebook timeline and the evolution trend are *** codebook is elaborated with its motivation,the corresponding feedback mechanism,and the format of the precoding matrix *** insights are given to help grasp the underlying reasons and intuitions of these ***,we point out some unresolved challenges of the codebooks for future evolution of the *** general,this paper provides a comprehensive review of the codebooks in 5G NR and aims to help researchers understand the CSI feedback schemes from a standard and industrial perspective.

关键词： codebook CSI 5G NR frequency division duplex multiple-input multiple-output

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Unified Performance Analysis of Antenna Selection Schemes for Cooperative MIMO-NOMA With Practical Impairments

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IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS 2022年第6期21卷 4364-4378页

作者： Aldababsa, Mahmoud Guven, Eray Durmaz, M. Akif Goztepe, Caner Kurt, Gunes Karabulut Kucur, Oguz Istanbul Gelisim Univ Dept Elect & Elect Engn TR-34310 Istanbul Turkey Istanbul Tech Univ Dept Elect & Commun Engn TR-34469 Istanbul Turkey Turkcell Technol 5G Res & Dev Team TR-34854 Istanbul Turkey Polytech Montreal Dept Elect Engn Polygrames Res Ctr Montreal PQ H3T 1J4 Canada Gebze Tech Univ Dept Elect Engn TR-41400 Gebze Turkey

This paper presents a unified outage probability (OP) performance analysis of two hybrid antenna selection (AS) schemes, transmit antenna selection (TAS) and maximal ratio combining (MRC), and joint transmit and receive antenna selection (JTRAS) in multiple-input multiple-output non-orthogonal multiple access based downlink amplify-and-forward (AF) relaying network with channel estimation error (CEE) and feedback delay (FD). Since the communications in the first and second hops are kinds of single-user and multi-user communications, respectively the AS is done as optimal TAS/MRC or JTRAS is applied in the first hop while the suboptimal majority-based TAS/MRC or JTRAS is employed in the second hop. For both TAS/MRC and JTRAS schemes, the OP expressions are derived in single closed-form over Nakagami-m fading channels in the practical and ideal cases. Moreover, in the practical case, the lower bound OP expressions are found and at high signal-to-noise ratio (SNR) values, the OP reaches an error floor value, which means zero-diversity order. In the ideal case, asymptotic OP expressions are obtained in high SNR regime and demonstrate achievable non-zero diversity and array gains. Finally, through simulations and software-defined radio-based real-time tests, the accuracy of theoretical analysis is validated.

关键词： Outage probability transmit antenna selection maximal ratio combining joint transmit and receive antenna selection multiple-input multiple-output non-orthogonal multiple access channel estimation error feedback delay software-defined radio-based real-time tests

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