Results 11 to 20 of about 13,209,149 (311)
NOMA-Based Coexistence of Near-Field and Far-Field Massive MIMO Communications [PDF]
IEEE Wireless Communications Letters, 2023 This letter considers a legacy massive multiple-input multiple-output (MIMO) network, in which spatial beams have been preconfigured for near-field users, and proposes to use the non-orthogonal multiple access (NOMA) principle to serve additional far ...
Zhiguo Ding, R. Schober, H. Poor
semanticscholar +1 more source
Hierarchical Beam Training for Extremely Large-Scale MIMO: From Far-Field to Near-Field [PDF]
IEEE Transactions on Communications, 2022 Extremely large-scale MIMO (XL-MIMO) is a promising technique for future 6G communications. The sharp increase in the number of antennas results in a transition of electromagnetic propagation from the far-field to the near-field.
Yu Lu, Linglong Dai
semanticscholar +1 more source
RIS-Aided Localization Under Position and Orientation Offsets in the Near and Far Field [PDF]
IEEE Transactions on Wireless Communications, 2022 This paper presents a rigorous Bayesian analysis of the information in the signal (consisting of both the line-of-sight (LOS) path and reflections from multiple reconfigurable intelligent surfaces (RISs)) that originate from a single base station (BS ...
Student Member Ieee Don-Roberts Emenonye +2 more
semanticscholar +1 more source
Over-the-Air Calibration of mmW Imaging Radars Using Uncorrelated Continuous Wave Signals
IEEE Journal of Microwaves, 2023 Magnitude and phase variations of radio-frequency channels in multiple-input multiple-output imaging radars require an accurate calibration in order to reduce side-lobe levels in the radar image and thus counteract missed detections.
Simon Heining +3 more
doaj +1 more source
Hybrid Method for Inverse Elastic Obstacle Scattering Problems
Mathematics, 2023 The problem of determining the shape of an object from knowledge of the far-field of a single incident wave in two-dimensional elasticity was considered. We applied an iterative hybrid method to tackle this problem. An advantage of this method is that it
Yuhan Yin, Juan Liu
doaj +1 more source
Superresolution Linear Optical Imaging in the Far Field. [PDF]
Physical Review Letters, 2021 The resolution of optical imaging devices is ultimately limited by the diffraction of light. To circumvent this limit, modern superresolution microscopy techniques employ active interaction with the object by exploiting its optical nonlinearities ...
A. A. Pushkina +4 more
semanticscholar +1 more source
Far-field super-resolution ghost imaging with a deep neural network constraint
Light: Science & Applications, 2022 Ghost imaging (GI) facilitates image acquisition under low-light conditions by single-pixel measurements and thus has great potential in applications in various fields ranging from biomedical imaging to remote sensing.
Fei Wang +6 more
semanticscholar +1 more source
Fundamentals of RIS-Aided Localization in the Far-Field [PDF]
IEEE Transactions on Wireless Communications, 2022 This paper develops fundamental bounds for localization in orthogonal frequency division multiplexing (OFDM) systems aided by reconfigurable intelligent surfaces (RISs).
Student Member Ieee Don-Roberts Emenonye +2 more
semanticscholar +1 more source
Sub-wavelength visualization of near-field scattering mode of plasmonic nano-cavity in the far-field
Nanophotonics, 2023 Spatial visualization of mode distribution of light scattering from plasmonic nanostructures is of vital importance for understanding the scattering mechanism and applications based on these plasmonic nanostructures. A long unanswered question in how the
Jin Xiao +12 more
doaj +1 more source
Generalized far-field integral
Optics Express, 2021 The propagation of light in homogeneous media is a crucial technology in optical modeling and design as it constitutes a part of the vast majority of optical systems. Any improvements in accuracy and speed are therefore helpful. The far-field integral is one of the most widely used tools to calculate diffraction patterns.
Zongzhao Wang +3 more
openaire +2 more sources