Improved Null Steering with Sidelobe Canceller for Linear Antenna Arrays

Abstract: Reduction of interference is one of the major tasks in a communication system. Jamming sources and clutter are the two major sources of interferences. The interferers are generally estimated by Direction of arrival (DOA) techniques and then they are suppressed by introducing nulls in those directions. Suppression of interference leads to higher Signal to Noise ratio and superior data rates. Clutter enters through the sidelobes. Therefore sidelobe reduction reduces the effect of clutter. Null Steering Algorithm generally estimate weights which are then multiplied with weights generated for sidelobe suppression. This paper focuses on introduction and steering of nulls in any desired direction and sidelobe suppression.

Keywords: Null Steering; Array Factor; Adaptive Beamforming; Antenna Array; Modified Bartlett- Hanning window.