Channel estimation for millimeter wave (mmWave) systems is challenging due to their large antenna arrays. Owing to the sparse scattering nature of the mmWave channel. channel estimation can be performed by estimating the directions and the gains of paths. Most existing schemes assume that a wideband mmWave channel exhibits a common sparsity in the frequency domain. https://www.nacrack.com/amazing-price-1997-2000-BMW-528I-Front-Bumper-Reinforcement-Bar-Used-Original-Exterior-OEM-great-save/