Digital beamforming to reduce antenna side lobes and minimize DOA error

Appropriate signal model derivation for transmitter and receiver can achieve side lobe reduction in phased array antenna and can also be used to accurately determining direction of arrival (DOA). Dolph-Chebyshev array structure is used for null placing in the antenna radiation pattern. This structure ensures nulls have been placed at proper positions to jam the interferers. For this purpose, interferers can be tracked by using direction of arrival estimation. This work investigates DOA for smart antenna array and thereby computes the error in DOA. This error is then removed by adding appropriate phase offset into input phase value to the array based on look-up table (LUT).