Sensor arrays provide additional degree of freedom in the spatial domain compared to a single antenna,which,with the aid of advanced signal processing algorithms,can be exploited for interference suppressio n/beamforming,direction of arrival estimatio n,and target tracking and localization.While two prominent technologies in 5G/6G communication system,i.e.,massive MIMO and millimeter(mm)wave communication,generally demand massive antennas,significant advances in antenna arrays are expected to satisfy the requirement of thousands of contemporaneously connected devices.
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