Abstract: Systems and methods of beamforming and improving mmWave communications for drones are described. Multiple RF chains are used to adapt the main beam to track changes without the use of pilot signals. To reduce interference, interfering signal power is eliminated by optimizing a non-Gaussian measure to extract the interferers. The AoA of signals from a target drone on neighbouring drones and location of the neighbouring drones and base stations are used to independently corroborate the location reported by the target drone. The base station provides additional synchronization signals below 6 GHz and restricts the search/measurement space in the vertical direction. The inherent sparse structure above 6 GHz is exploited by applying different beamformers on a sounding signal and estimating the AoA and impulse response. Variations of fully digital and hybrid beamforming architectures for multi-cell DL sync and CRS measurement are described.

Abstract: A display device, which has a bottom chassis provided with an opening formed at one side thereof and receiving light sources therein, and at least one optical member connected to the opening to enhance optical characteristics of light emitted from the light sources, includes an optical member fixing unit including integral supporters formed integrally with the bottom chassis; and separable supporters connected to the bottom chassis to prevent movement of the at least one optical member connected to the integral supporters. The display device allows the separable supporters to have a smaller size than that of a conventional middle bezel, thus reducing production costs and to easily assemble the at least one optical member to the bottom chassis.