Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2006-05-30
2006-05-30
Ngo, Ricky Q. (Department: 2663)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S335000, C370S342000, C375S141000, C455S562100
Reexamination Certificate
active
07054292
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.
REFERENCES:
patent: 5260968 (1993-11-01), Gardner et al.
patent: 5936569 (1999-08-01), Stahle et al.
patent: 6073032 (2000-06-01), Keskitalo et al.
patent: 6212406 (2001-04-01), Keskitalo et al.
patent: 6229796 (2001-05-01), Dent
patent: 6347234 (2002-02-01), Scherzer
patent: 6353601 (2002-03-01), Siira
patent: 6370129 (2002-04-01), Huang
patent: 6385181 (2002-05-01), Tsutsui et al.
patent: 6477161 (2002-11-01), Hudson et al.
Bagley Zachary
Ertel Richard B.
Giallorenzi Thomas R.
Hall Eric K.
Schlegel Christian
Chang Richard
Harrington & Smith ,LLP
L-3 Communications Corporation
Ngo Ricky Q.
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