Abstract: In this paper, we study the downlink precoding of spatial non-stationary (SnS) extremely large-scale multiple-input multiple-output (XL-MIMO) in the near-field channel with uniform spherical ...

NASA has announced when the longest total solar eclipse of the century will occur—and you won’t have to wait long. Here’s what you should know. According to NASA's solar eclipse calendar, the longest ...

China Eastern Airlines has set a new world record for the longest commercial passenger flight, while slashing travel time between China and South America by more than four hours.

The world’s longest and deepest undersea road tunnel is being built in Norway, intended to cut travel time between major cities and become part of a ferry-free highway along its western coast. The ...