## Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten. # Robust beamforming for quadratic antenna arrays in picocellular mobile environments

**Abstract**

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.