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Robust beamforming for quadratic antenna arrays in picocellular mobile environments

: Boche, H.; Kuhwald, T.

Institute of Electronics, Information and Communication Engineers -IEICE-, Tokyo:
International Symposium on Antennas and Propagation, ISAP 2000. Proceedings. Vol.1 : August 21 - 25, 2000, Fukuoka, Japan
Tokyo: IEICE, 2000
ISBN: 4-88552-169-6
International Symposium on Antennas and Propagation (ISAP) <2000, Fukuoka>
Fraunhofer HHI ()
adaptive antenna arrays; antenna phased arrays; antenna radiation patterns; array signal processing; code division multiple access; directive antennas; linear antenna arrays; picocellular radio; robust beamforming; quadratic antenna arrays; picocellular mobile environments; smart antennas; future mobile communication systems; robust constrained beamforming algorithm; two dimensional linear antenna arrays; 2d linear antenna arrays; azimuth-plane; elevation-plane; 1d directivity controlled constrained beamformer; one-dimensional directivity controlled constrained beamformer; phased array; beam pattern; minimum bit error rate; asynchronous cdma systems

Smart antennas may be used in future mobile communication systems in order to increase the system capacity and system performance. We propose a new robust constrained beamforming algorithm for two dimensional linear antenna arrays. The algorithm is based on the product of two basic patterns which control the azimuth- and elevation-plane separately. The azimuth is constructed by using a one-dimensional directivity controlled constrained beamformer and the elevation is constructed by using a phased array. In contrast to two dimensional constrained beamforming algorithms, where the existence of a beam pattern is not always guaranteed, for an M*N element array, this approach leads to an optimum solution for N-1 arbitrary positions of the nulls. Furthermore, the constructed beam pattern provides maximum directivity, which leads to a minimum bit error rate in asynchronous CDMA systems.