Patent ID: 6317412
Filing Date: 2001-11-13
Classification: H04B

Abstract:
In a spread spectrum CDMA communication system in which a base station communicates with a multiplicity of subscriber terminals and the signal transmitted by the base station is comprised of a set of substantially orthogonal functions which are overlaid with a pseudo-noise (PN) sequence forming a coded spreading sequence for an information signal, each orthogonal function of said set of substantially orthogonal functions carries data for a single user in said system, a source of selected carrier signals and a modulator to modulate said information signal onto a carrier to form a transmit signal and said coded spreading sequence on said transmit signal for broadcasting, each subscriber terminal has a receiver with a demodulator for coherently demodulating a base station signal and multiple base stations are deployed in a ""cellular"" coverage structure, the improvement comprising increasing system capacity by dividing an available spectrum into non-overlapping frequency segments which are assigned to different cells in a frequency reuse pattern to provide greater system capacity than full frequency reuse in each cell.