Code division switching scheme

Details Code division switching scheme Code division switching scheme

1996-12-18

1999-03-02

Patel, Ajit

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

375200, H04B 7216

Patent

active

058780378

ABSTRACT:
Each user signal of a communications network is encoded using a narrowband traffic code and a wideband cover code for transmission to a signal relay (e.g., a communications satellite) in one of a plurality of uplink signal beams. The signal relay receives all of the user signals in the different uplink signal beams and processes them to re-transmit them in different downlink signal beams to their different appropriate destinations. The narrowband traffic codes and wideband cover codes are selected to encode the individual user signals in such a way as to permit the switching processing of the signal relay to be implemented at the beam level (e.g., individual components processing multiple user signals at a time) rather than at the user level (e.g., one switching circuit for each user). For example, in one embodiment, all user signals within the same signal beam are encoded using different narrowband codes and the same wideband cover code, while user signals in different signal beams are encoded using different wideband cover codes. The present invention enables a reduction in the volume and cost of switching equipment within the signal relay. Furthermore, much of the switching processing can be implemented at intermediate frequencies (IF) using conventional, relatively inexpensive radio frequency (RF) components.

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patent: 5640416 (1997-06-01), Chalmers
patent: 5703874 (1997-12-01), Schilling
patent: 5712868 (1998-01-01), Stern et al.
patent: 5737327 (1998-04-01), Ling et al.

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