Use of wide element spacing to improve the flexibility of a...

Details Use of wide element spacing to improve the flexibility of a... Use of wide element spacing to improve the flexibility of a...

2005-10-18

2005-10-18

Ngo, Ricky (Department: 2663)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S339000, C370S342000

Reexamination Certificate

active

06956838

ABSTRACT:
A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system, as is a system that operates in accordance with the method. The method operates, within a coverage area of a base station (BS), to assign the same spreading code to a plurality of subscriber stations (SSs) and to transmitting signals to, and receive signals from, the SSs using an antenna array having M elements, where M>1 and where the M elements are spaced apart by more than one-half wavelength from one another. The spacing is a function of a size of an aperture of the antenna array which is a function of a signal bandwidth to carrier frequency ratio. The antenna array aperture is preferably less than k=p/360*fc/B wavelengths, where p is a maximum acceptable phase variation over the signal bandwidth, where fc is the carrier frequency and where B is the signal bandwidth. The step of conducting communications includes steps of despreading a plurality of received signals; and beamforming the plurality of despread received signals. In a preferred embodiment individual ones of P orthogonal spreading codes are reused αM times within the coverage area, where 1/M<α≦1.

REFERENCES:
patent: 5260968 (1993-11-01), Gardner et al.
patent: 5990832 (1999-11-01), Mayrargue
patent: 6167286 (2000-12-01), Ward et al.
patent: 6347234 (2002-02-01), Scherzer
patent: 6370129 (2002-04-01), Huang

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