Orthogonal code division multiple access on return link of...

Details Orthogonal code division multiple access on return link of... Orthogonal code division multiple access on return link of...

2003-05-01

2009-12-15

Sheikh, Ayaz R (Department: 2419)

Multiplex communications

Communication over free space

Repeater

C370S320000, C370S316000, C370S342000, C370S305000, C375S213000, C375S147000, C375S213000

Reexamination Certificate

active

07633895

ABSTRACT:
Orthogonal CDMA (OCDMA) in the return link of a satellite based communications system provides improved bandwidth efficiencies; increased ability to overcome channel degrading phenomenon; reduced transmission power; or various combinations thereof. By achieving code synchronization needed for advantageous use of OCDMA in the return link of a satellite based communication system, a plurality of terminals, each with a unique time slot/code channel assignment, may transmit concurrently, with the same, or lower, aggregate power as would be used by a single terminal using TDMA. Use of OCDMA in the return link allows one or more terminals, each in a common beam and assigned a common time slot, to transmit at a higher transmission power to overcome channel degradation effects. The ability to allow for higher transmission power for a particular terminal can increase the effective data rate for that terminal by enabling the use of a higher order modulation technique.

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