Bulk despreading of multiple independent CDMA sources

Details Bulk despreading of multiple independent CDMA sources Bulk despreading of multiple independent CDMA sources

1997-10-10

2000-07-18

Nguyen, Chau

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

370320, H04B 7216, H04J 1100

Patent

active

060917032

ABSTRACT:
A communications system (100) is disclosed for processing at least one uplink channel contained in at least one uplink beam (112) transmitted to a satellite (106). The communications system (100) includes at least one user terminal (110) that extracts a system clock, a synchronization word, and timing correction information from a downlink beam transmitted by a satellite. The user terminal includes a timing controller (226) that aligns uplink channel transmissions by generating a system clock based on the downlink symbol clock, said synchronization word, and said timing correction information. The user terminal includes at least one spread-spectrum spreader (254) for encoding at least one uplink channel, and a transmitter connected to the spread-spectrum spreader (254) for transmitting said at least one uplink channel in an uplink beam (112). The system also includes a satellite (106) which generates the synchronization word, downlink symbol clock, and the timing correction information needed by the user terminal. The satellite also includes a wideband FFT processor (322) that extracts uplink channels from the uplink beam (112) in bulk, and a despreader (326) connected to the FFT processor (322) for simultaneously despreading user signals contained in said uplink channels.

REFERENCES:
patent: 5696762 (1997-12-01), Natali et al.
patent: 5822359 (1998-10-01), Bruckert et al.
patent: 5838669 (1998-11-01), Gerakoulis
patent: 5898362 (1999-04-01), Ibanez-Meier et al.
patent: 5910945 (1999-06-01), Garrison et al.
patent: 5966373 (1999-10-01), Stephenson et al.
patent: 5995497 (1997-12-01), Gerakoulis

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