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检索条件"主题词=multiple-input-multiple-output"

共 162 条记录，以下是131-140 订阅

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Rate-Embedded Doubly Directional Differential Space-Time-Frequency Coding Schemes

Rate-Embedded Doubly Directional Differential Space-Time-Fre...

引用

5th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Zhang, Hongwei Li, Xiaohui Lu, Lu Anhui Univ Key Lab Intelligent Comp & Signal Proc Minist Educ Hefei 230039 Peoples R China Hefei Informat Resource Management Ctr Hefei Peoples R China

ISBN: (纸本)9781424436927

Due to a great many redundancy symbols, most of the existing differential space-time-frequency (DSTF) coding schemes suffer very low transmission rates. To overcome the disadvantage and obviously enhance the total transmission rate in a differential multiple-input-multiple-output (MIMO) orthogonal-frequency-division-multiplexing (OFDM) system, a rate embedded doubly directional DSTF coding scheme is proposed for doubly selective fading channels in this paper. High rate differentially coded matrices are embedded into proper time blocks and sub-carriers. In the frequency domain, both high rate non-unitary message matrices and low rate unitary message matrices are differentially transmitted alternately. In the time domain, all message matrices have full rates. Simulation results verify that, compared with those conventional DSTF coding schemes, the proposed scheme can achieve better error performances with higher transmission rates.

关键词： multiple-input-multiple-output spectral efficiency orthogonal-frequency-division-multiplexing differential space-time-frequency rate-embedded

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Emerging DSP techniques for multi-core fiber transmission systems: Techniques DSP émergentes pour les systèmes de transmission à fibres optiques multicœurs

Emerging DSP techniques for multi-core fiber transmission sy...

引用

作者： Abouseif, Akram Institut polytechnique de Paris

学位级别：博士

Les systèmes de communication optique ont connu plusieurs phases de développement au cours des dernières décennies. Ils approchent aujourd'hui les limites de capacité du cana non-linéaire. L'espace est aujourd'hui le dernier degré de liberté à mettre en œuvre afin de continuer à répondre aux demandes de capacité à venir pour les prochaines années. Par conséquent, des recherches intensives sont menées pour explorer tous les aspects concernant le déploiement du système de multiplexage par division spatiale (SDM). Plusieurs dégradations ont un impact sur les systèmes SDM en raison de l'interaction des canaux spatiaux qui dégrade les performances du système. Dans cette thèse, nous nous concentrons sur les fibres multicœurs (MCF) comme l'approche la plus prometteuse pour être le premier représentant du système SDM. Nous présentons différentes solutions numériques et optiques pour atténuer l'effet non unitaire connu sous le nom de perte dépendante du cœur (CDL). La première partie est consacrée à l'étude des performances de la transmission MCF en tenant compte des dégradations de propagation qui impactent les systèmes MCF. Nous proposons un modèle de canal qui aide à identifier le système MCF. La deuxième partie est consacrée à la technique optique pour améliorer les performances de transmission avec une solution optimale pour la réduction des CDL. Ensuite, nous avons introduit des techniques numériques pour des améliorations supplémentaires, la pré-compensation Zero Forcing et le codage spatio-temporel pour une atténuation CDL supplémentaire. Tous les résultats de simulation sont validés analytiquement en dérivant les bornes supérieures de probabilité d'erreur. Optical communication systems have seen several phases in the last decades. It is predictable that the optical systems as we know will reach the non-linear capacity limits. At the moment, the space is the last degree of freedom to be implemented in order to keep delivering the upcoming capacity demands for the nex

关键词： Communications optiques Fibre multicoeur Entrées multiples sorties multiples MIMO Conception de fibre Modèle de canal et codage espace-temps Optical communications Multi-core fiber multiple-input-multiple-output MIMO Fiber design Channel model and space-time coding

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Active-Sensing-Based Beam Alignment for Near Field MIMO Communications 59

Active-Sensing-Based Beam Alignment for Near Field MIMO Comm...

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59th Annual IEEE International Conference on Communications (IEEE ICC)

作者： Jiang, Hao Wang, Zhaolin Liu, Yuanwei Queen Mary Univ London London England

ISBN: (纸本)9781728190549

An active-sensing-based learning algorithm is proposed to solve the near-field beam alignment problem with the aid of wavenumber-domain transform matrices (WTMs). Specifically, WTMs can transform the antenna-domain channel into a sparse representation in the wavenumber domain. The dimensions of WTMs can be further reduced by exploiting the dominance of line-of-sight (LoS) links. By employing these lower-dimensional WTMs as mapping functions, the active-sensing-based algorithm is executed in the wavenumber domain, resulting in an acceleration of convergence. Compared with the codebook-based beam alignment methods, the proposed method finds the optimal beam pair in a ping-pong fashion, thus avoiding high training overheads caused by beam sweeping. Finally, the numerical results validate the effectiveness of the proposed method.

关键词： Beam alignment deep learning multiple-input-multiple-output near-field communications

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Active Constraints Inspired Zero-Forcing Precoder Design under Per-Antenna Power Constraints 14

Active Constraints Inspired Zero-Forcing Precoder Design und...

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14th IEEE International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Hu, Xianzhi Dai, Xuchu Univ Sci & Technol China Sch Informat Sci & Technol Key Lab Wireless Opt Commun Chinese Acad Sci Hefei Peoples R China

ISBN: (纸本)9781665450850

This paper investigates the problem of linear zero-forcing (ZF) precoder design for sum rate maximization under per-antenna power constraints (PAPCs). A conventional method to tackle this problem is to lift it into a convex determinant maximization program with respect to the transmit covariance matrices, whose complexity, however, increases dramatically as the problem size increases. A suboptimal alternative is to adopt a semi-closed-form pseudo-inverse solution, whose performance, however, becomes dramatically inferior to the optimal design as the number of transmit antennas goes large. A new low-complexity high-performance ZF precoder design under PAPCs is proposed in this paper. Specifically, we first investigate the power usage at each transmit antenna for ZF precoding under PAPCs and identify a lower bound on the number of power constraints that should be active (i.e., satisfied with equality) at the optimal ZF precoder. Then, we devise a low-complexity iterative algorithm to find a ZF precoder satisfying PAPCs, at which the number of active power constraints meets the lower bound requirement for optimality. Simulation results show that the proposed ZF precoder achieves the near-optimal sum rate with significantly reduced computational complexity.

关键词： Zero-forcing per-antenna power constraints active power constraints multiple-input-multiple-output

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Circularly Polarized Dual Antenna with Crescent Axed Sporadic Meander Traces Isolated by Shorting Pins and Defected Ground for Wi-Fi Sensing 4

Circularly Polarized Dual Antenna with Crescent Axed Sporadi...

引用

IEEE 4th International Symposium on Joint Communications and Sensing (JC and S)

作者： Kamal, Shahanawaz Adler, Jan Matthe, Maximilian Sen, Padmanava Barkhausen Inst D-01067 Dresden Germany

ISBN: (纸本)9798350385458;9798350385441

This paper introduces a dual-element multiple-input multiple-output (MIMO) microstrip antenna for device to-device (D2D) integrated sensing and communications (ISAC) applications in the Wi-Fi 6 GHz spectrum. Each radiating element was equipped with a feeding port on one of its ends that was connected to a quarter-wavelength (0.25A) line for impedance matching. The 0.25A line was subsequently coupled to a crescent axed sporadic meander trace for attaining circular polarization (CP) and antenna miniaturization. In particular, axial ratio (AR) of <3 dB was realized in a compact area of 5.3 cm x 53 cm that is 1.1 lambda x 1.1 lambda at the center frequency (f(center)) of 6.33 GHz. A rectangular microstrip was integrated between the two radiating elements, and at the same time, along the edge of the dielectric substrate to render a parasitic resonance that ultimately contributed in producing the omnidirectional circularly polarized (OCP) electromagnetic (EM) waves. Furthermore, a decoupling architecture composed of multiple shorting pins that extended from the parasitic element to the defected ground was introduced for accomplishing a high average isolation of >20 dB. Flame resistant (FR-4), an inexpensive dielectric substrate with low profile of 0.03A was used to yield a wide impedance bandwidth (I-BW) ranging from 4.42 GHz 8.24 GHz. The simulated computations, and the measurement results procured within the anechoic chamber confirmed substantial agreement. Moreover, lab experiments proved the suitability of the manufactured antenna for communications applications. In contrast with contemporary antennas, the proposed antenna occupied small area and low-profile to exhibit a wide axial ratio bandwidth (AR-BW) that combines with reasonable performance in terms of I-BW and average isolation.

关键词： Antenna circular polarization isolation integrated sensing and communications low-profile miniature multiple-input-multiple-output omnidirectional wideband

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Compact Meta-surface Antenna Array Decoupling (MAAD) Design for Tightly Coupled Antennas

Compact Meta-surface Antenna Array Decoupling (MAAD) Design ...

引用

International Workshop on Antenna Technology (iWAT) - Small Antennas and Novel Metamaterials

作者： Zhao, Xiaoyuan Liu, Feng Liu, Yujia Zhao, Luyu Liu, Ying Xidian Univ Key Lab Sci & Technol Antennas & Microwaves Xian Shaanxi Peoples R China

ISBN: (纸本)9781538682692

This paper introduces a series of antenna array decoupling method named Meta-surface Antenna Array Decoupling (MAAD) Method. It has two forms: meta-cover and meta-ground, which place sub-wavelength resonators above and below an antenna array, respectively. By properly adjusting the working frequency of the sub-wavelength resonators, the distance between the antenna array and the meta-surface as well as the self-matching of each antenna array elements, the method can significantly reduce the mutual coupling between the element in an array, while maintain or even increase its matching bandwidth. Thanks to the periodic nature of the meta-surface, the method can directly extended to antenna arrays with more than two elements. It can find good application scenarios in both mobile terminals and Massive MIMO base stations of 5G wireless communication systems.

关键词： Metamaterial Meta-surface mutual coupling multiple-input-multiple-output 5G millimeter wave

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Compact Quad-Element Triple-Band MIMO Antennas for WLAN/WiMAX Applications

Compact Quad-Element Triple-Band MIMO Antennas for WLAN/WiMA...

引用

IEEE Indian Conference on Antennas and Propogation (InCAP)

作者： Saurabh, Arun Kumar Meshram, Manoj Kumar Indian Inst Technol BHU Dept Elect Engn Varanasi Uttar Pradesh India

ISBN: (纸本)9781538670606

In this paper, an extremely compact tri-band quad-element multiple-input-multiple-output (MIMO) antenna is proposed. The single element configuration of a proposed MIMO antenna consisting of a microstrip line feed, T-shaped monopole with dual inverted L-shaped slits is realized. The proposed MIMO antenna is resonating at the frequency 2.42 GHz, 5.32 GHz, and 3.51 GHz for wireless local area networks (WLAN) and worldwide interoperability for microwave access (WiMAX) applications. The overall size of the proposed quad element MIMO antenna is 30x30x0.8 mm(3) with minimum isolation of 13.5 dB among MIMO elements with respect to its operating bands. The envelope correlation coefficient (ECC) of the proposed MIMO antenna is lower than the acceptable limit across the triple operating bands. The simulated and measured S-parameters of the proposed antennas are found in good agreement.

关键词： envelope correlation coefficient diversity gain multiple-input-multiple-output wireless local area networks worldwide interoperability for microwave access component

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Analysis of Secrecy Rate against Eavesdroppers in MIMO Modulation Systems

Analysis of Secrecy Rate against Eavesdroppers in MIMO Modul...

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7th IEEE International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Wei, Yaman Wang, Li Svensson, Tommy Beijing Univ Posts & Telecommun Sch Elect Engn Beijing Peoples R China Southeast Univ Natl Mobile Commun Res Lab Nanjing Jiangsu Peoples R China Chalmers Univ Technol S-41296 Gothenburg Sweden

ISBN: (纸本)9781467376877

In multiple-input-multiple-output (MIMO) wireless communications, Space Shift Keying (SSK), Spatial modulation (SM) and Generalized Space Shift Keying (GSSK) are three novel MIMO modulation techniques, that can greatly reduce the complexity of MIMO systems. This paper investigates the physical-layer security in typical MIMO systems of these three modulations. We present an exhaustive analysis of secrecy rate for multiple antennas destination and eavesdroppers receivers. Without eavesdroppers channel information, both achievable secrecy rate and bit error rate (BER) are studied through joint modulated signal and jamming signal transmission. Our simulation results demonstrate that the proposed proactive source jamming method achieves improvement of secrecy rate and improved BER performance for multi-antenna users.

关键词： multiple-input-multiple-output space shift keying spatial modulation generalized space shift keying eaves-dropping secrecy rate

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Design of Detectors and Decoders for MIMO Wireless Systems

Design of Detectors and Decoders for MIMO Wireless Systems

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作者： Tang, Wei University of Michigan

学位级别：Ph.D., Doctor of Philosophy

multiple-input-multiple-output (MIMO) technology makes use of multiple transmit and receive antennas to improve the spectral efficiency and reliability by spatial diversity and multiplexing. However, MIMO systems require complicated baseband detector designs to cancel the Inter-Antenna Interference. This work develops high-performance and energy efficient MIMO detectors using state-of-the-art iterative detection and decoding, message-passing detection and expectation-propagation detection approaches. Iterative Detection and Decoding, or IDD, is an iterative receiver design that improves the error rate performance and relaxes both the detector and decoder designs by iterating the soft decisions between the detector and the decoder. Through iterative interference cancellation and error correction, the Signal-to-Interference-and-Noise Ratio can be substantially improved. We demonstrate a 2.4mm2 4x4 MIMO IDD ASIC incorporating Minimum Mean Squared Error (MMSE) detector and Non-Binary Low-Density Parity Check (NBLDPC) decoder. The IDD chip exploits an nonbinary interface between the detector and the decoder to achieve a 1.02Gb/s throughput, 20pJ/b energy efficiency and superior detector performance compared to previous detector designs. The upcoming 5G wireless communication relies on scaling up the numbers of antennas at the base station, using a new technology known as massive MIMO. Massive MIMO often refers to a multiple-user wireless communication system, where the base station is equipped with hundreds of antennas and serves tens of single-antenna user terminals. A large number of antennas entails a high complexity in baseband digital signal processing. To lower the complexity, previously demonstrated massive MIMO systems deployed linear detectors. Despite its simplicity, a linear detector requires expensive matrix inversion operations, the cost of which can become excessive in a massive MIMO system. In a rich scattering environment, a massive MIMO channel can be mo

关键词： MIMO detector Massive MIMO Iterative detector and decoder multiple-input-multiple-output Mean Squared Error

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Advances in Nonlinear Model Predictive Control and Their Applications in Chemical Engineering

Advances in Nonlinear Model Predictive Control and Their App...

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作者： Lin, Kuan-Han Carnegie Mellon University

学位级别：Ph.D., Doctor of Philosophy

Model Predictive Control (MPC) has emerged as a promising optimization-based controller in various industrial applications because of its nature of coping with variable bounds and multiple-input-multiple-output (MIMO) dynamic processes. Nonlinear MPC (NMPC) is the nonlinear branch of MPC that makes use of the nonlinear model and constraints to achieve higher accuracy for systems with complicated dynamics. However, the performance of NMPC is influenced by process uncertainty and computational delays. In addition, it faces stability challenges when considering economically oriented objectives. This thesis aims to enhance the performance of NMPC by developing advanced features that improve robustness, stability, and economic efficiency while maintaining reasonable online computation by leveraging both control and optimization theory. First, we consider the well pumping period in hydraulic fracturing and propose a robust control strategy aimed at addressing the constraint violations on operating pressure and terminal requirements resulted from the uncertainty in the rock layer. A comprehensive dynamic model that captures the process is constructed and incorporated into the predictive model of the robust multistage NMPC, which uses a scenario tree to depict the evolution of states with respect to uncertain parameters. The results demonstrate the promising robustness of the controller, as it satisfies all constraints in the face of the rock uncertainty that changes in time. Next, we develop a strategy to alleviate the online computational burden associated with solving Moving Horizon Estimation (MHE) problems, which is essential for NMPC when the process information is incomplete. We propose to solve an extended horizon MHE within a specified number of delayed sampling steps. This approach uses predicted future measurements in background and nonlinear programming (NLP) sensitivity to execute online corrections once the true measurements are available. The proposed algorit

关键词： Model Predictive Control Nonlinear programming Process control Nonlinear MPC multiple-input-multiple-output Online computation

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