Chicago has numerous nicknames, including Chi-town, Windy City and Second City. The city is a center for business and finance and is considered one of the world's top global financial centers. Since ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

Abstract: The large array aperture of extremely large-scale multiple-input multiple-output (XL-MIMO) systems necessitates the consideration of near-field (NF) spherical wavefront, which significantly ...

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Abstract: Using linear arrays for compressive sensing-based (CS) three-dimensional (3D) millimeter-wave (mmWave) channel estimation presents significant challenges due to the dimensional limitations ...

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Institute of Advanced Technology on Semiconductor Optics and Electronics, School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China ...