Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception. This is achieved by combining elements in a phased array in such a way that signals at particular angles experience constructive interference while others experience destructive interference.

Blind Beamforming for non Gaussian Signals
Beamforming: a versatile approach to spatial filtering
Opportunistic beamforming using dumb antennas
Opportunistic beamforming using dumb antennas
Opportunistic beamforming using dumb antennas
Grassmannian beamforming for multiple-input multiple-output wireless systems
Grassmannian beamforming for multiple-input multiple-output wireless systems
An alternative approach to linearly constrained adaptive beamforming
On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming
On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming