Sector beam synthesis for cellular systems using phased antenna arrays

Cell sectorization is used extensively to increase the capacity of cellular systems; however, intersector interference caused by nonideal sector anten nas limits full realization of sectorization benefits, In this paper, we pr opose a new technique for sector beam synthesis using phased antenna arrays . We adopt the criterion of minimizing intersector interference, subject to a peak-to-peak ripple constraint on the in-sector power pattern, Spectral factorization permits a reparameterization yielding an easily solved fracti onal linear program. The proposed procedure accommodates nonisotropic anten na elements, arbitrary element spacing, and arbitrary sector boundaries, bu t is limited to uniformly spaced linear arrays. To demonstrate the utility of the proposed method, it is used to predict antenna array size requiremen ts for a direct-sequence code-division multiple-access (DS-CDMA) cellular s ystem.