Massive MIMO is a reality—What is next?: Five promising research directions for antenna arrays

TL;DR: By implementing IDFT on the second-order virtual array signals characterized by the equivalent spatial frequency, it is proved that the resulting spatial response enables to effectively estimate both DOA and source power with an increased number of DOFs.

TL;DR: In this article , the authors considered two types of receivers in the radiating near field of the RIS: (1) when the receiver is equipped with a uniform linear array (ULA), they designed RIS coefficient to convert planar waves into cylindrical waves; (2) when a single antenna was used to transform planar wave into spherical wave; and (3) the maximum likelihood (ML) method and the focal scanning (FS) method were used to sense the location of the receiver based on the analytic expression of the reflection coefficient, and derive the corresponding position error bound.

TL;DR: A novel alternating optimization algorithm with guaranteed convergence and improvement at each step is proposed to solve the highly-coupled non-convex problem in cell-free massive multiple-input multiple-output systems.

TL;DR: This correspondence uses the cross-covariance matrix to exploit the full array aperture and employ the atomic norm minimization technique to retrieve the angle information without discretization in a single far-field or near-field source localization method.

TL;DR: The second edition of this respected text considerably expands the original and reflects the tremendous advances made in the discipline since 1968 as discussed by the authors, with a special emphasis on applications to diffraction, imaging, optical data processing, and holography.

TL;DR: In this article, the authors examined the performance of using multi-element array (MEA) technology to improve the bit-rate of digital wireless communications and showed that with high probability extraordinary capacity is available.

TL;DR: A cellular base station serves a multiplicity of single-antenna terminals over the same time-frequency interval and a complete multi-cellular analysis yields a number of mathematically exact conclusions and points to a desirable direction towards which cellular wireless could evolve.