Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1995-05-03
1998-07-14
Safourek, Benedict V.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370342, 375299, 375347, 455 521, H04J 1300
Patent
active
057815410
ABSTRACT:
An arrangement (apparatus and method) for providing a code division multiple access (CDMA) transmission system in an urban environment using spatially-diverse antennas and time-diversity devices and techniques to provide improved cell coverage without the detrimental effects of multipath (Rayleigh) fading. The spatially-diverse antennas output identical CDMA-modulated signals to a serving area at different times, whereby each CDMA-modulated signal output from a corresponding antenna has a sufficent delay to avoid mutual interference with the identical CDMA-modulated signals output from other antennas. The delay assigned to each antenna is within a range greater than a chip interval, and less than or equal to a base station sequence offset between base stations. As a result, a subscriber station is able to separately demodulate the received CDMA-modulated signals from the different antennas as CDMA signals having adequate multipath delay for demodulation using a rake receiver. The delays may be implemented as delay devices supplying delayed system clock signals from a GPS receiver to corresponding base stations having identical spreading sequences. Alternatively, the delays may be implemented as successively delaying a CDMA-modulated signal output by a single base station before transmission to the antennas along corresponding transmission paths.
REFERENCES:
patent: 5101501 (1992-03-01), Gilhousen et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5195090 (1993-03-01), Bolliger et al.
patent: 5243598 (1993-09-01), Lee
patent: 5267261 (1993-11-01), Blakeney, II et al.
patent: 5278892 (1994-01-01), Bolliger et al.
patent: 5280472 (1994-01-01), Gilhousen et al.
patent: 5305308 (1994-04-01), English et al.
patent: 5375140 (1994-12-01), Bustamante et al.
patent: 5381443 (1995-01-01), Borth et al.
patent: 5437055 (1995-07-01), Wheatley, III
patent: 5497395 (1996-03-01), Jou
patent: 5513176 (1996-04-01), Dean et al.
patent: 5533011 (1996-07-01), Dean et al.
The CDMA Standard, David P. Whipple, Applied Microwave & Wireless, pp. 28-37.
Bell Atlantic Network Services Inc.
Jung Min
Safourek Benedict V.
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