The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 30, 2006
Filed:
Apr. 12, 2001
Eric K. Hall, Holliday, UT (US);
Thomas R. Giallorenzi, Riverton, UT (US);
Richard B. Ertel, Midvale, UT (US);
Christian Schlegel, Park City, UT (US);
Zachary Bagley, Salt Lake City, UT (US);
Eric K. Hall, Holliday, UT (US);
Thomas R. Giallorenzi, Riverton, UT (US);
Richard B. Ertel, Midvale, UT (US);
Christian Schlegel, Park City, UT (US);
Zachary Bagley, Salt Lake City, UT (US);
L-3 Communications Corporation, New York, NY (US);
Abstract
A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system. The method includes steps of, within a coverage area of a base station (BS), (a) assigning the same spreading code to a plurality of subscriber stations (SSs); and (b) beamforming using an antenna array at the BS so as to maximize the signal to interference plus noise ratio for a signal transmitted from a desired SS, The beamforming operates to steer a null towards another same-code SS to minimize interference from the same-code SS. Assuming that the antenna array has M-elements (M>1), then individual ones of P orthogonal spreading codes can be reused αM times within the coverage area, where 1/M<α≦1. The step of beamforming includes an initial step of despreading the signal received from the desired SS, followed by a step of spatial filtering.