An adaptive beamforming approach for interference rejection for high altitude airborne CDMA systems

Interference rejection is essential for being able to effectively communicate with mobile users using a high flying airborne platform employed with a conventional Code Division Multiple Access (CDMA) base station. The resulting signal spatial structure and signal gain observed from the mobile users is significantly degraded due to other interfering signals and potential jammers. In order to combat this, a novel approach is offered to use an adaptive beamforming method to accurately point its beam in the desired look direction while simultaneously nulling out other undesired interfering signals within the highly dynamic environment. This paper will investigate using adaptive beamforming algorithms as a front-end solution for interference rejection for a high flying airborne platform outfitted with a conventional CDMA system. Cooperatively, the simulation results will show performance measurements, and a logical motivation for utilizing adaptive beamforming in a highly congested and highly dynamic environment.