Highly structured rosette antenna arrays for wireless multimedia systems

Wireless multimedia systems that use 3-7 GHz spectrum will require significant frequency reuse and packing of coverage zones to achieve the data delivery densities necessary to support large scale multimedia services. Based on service up-take rates of 1-6% by the households located within an urban core, data delivery densities of 100-600 MB/S/km/sup 2/ need to be sustained to support wireless services such as video-on-demand and high speed data dissemination. We examine whether it is possible to achieve such densities by using narrow sector antenna arrays, which when arranged around a hub as oblong microcells, form rosette-like macrocells (rosettes) providing a full 360 degree coverage. Such architectures are interesting because oblong microcells allow interlacing and offer the possibility of C/I control by geometrical orientation and alignment of microcell and subscriber antennas. The rosettes studied here have assignments of co-frequency channels in every N/sup th/ microcell, where N is the number of distinctly different sets of co-frequency channel groups. Microcells are spaced uniformly around a hub with each microcell being placed in that region of low sidelobe radiation generated by the adjacent co-frequency microcells.