Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

Abstract: With the rapid advancement of three-dimensional laser ranging imaging technology and the continuous expansion of array scale, more demanding requirements such as stronger anti-interference ...

Abstract: This paper delves into a novel compressed sensing (CS) strategy for estimating the directions of incoming signals in a coherent environment using a lens antenna array (LAA). In comparison to ...