Null-steering beamforming for cancellation of Co-channel interference in CDMA wireless communication system

Multipath fading effects and co-channel interference are the main limitations facing wireless communication systems. The problem to enhance the capacity of a code-division multiple-access (CDMA) in wireless communication system can be solved implementing an interference management. Many techniques controlling or suppressing an interference in CDMA wireless communication systems by transmitter and/or receiver, such as the transmit power control, multiuser detection, receiver beamforming, and transmit beamforming have been proposed to date. This paper deals with the possibilities to cancel unwanted signals by steering nulls of the pattern in the direction of arrival (DOA) of the signal while keeping the main beam to desired direction. Here we proposed a null steering beamforming algorithm to suppress co-channel interference in CDMA wireless communication systems that is based on the iterative method. Finally, simulation results confirm our theoretical study and efficacy of the proposed beamforming algorithm for CDMA wireless communication systems.