System and method for orthogonal spread spectrum sequence genera

Details System and method for orthogonal spread spectrum sequence genera System and method for orthogonal spread spectrum sequence genera

1994-09-21

1998-05-12

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

370209, H04B 1500, H04K 100, H04L 2730

Patent

active

057517614

ABSTRACT:
A method and system for allocating a set of orthogonal PN code sequences of variable length among user channels operative at different data rates in a spread spectrum communication system is disclosed herein. PN code sequences are constructed that provide orthogonality between users so that mutual interference will be reduced, thereby allowing higher capacity and better link performance. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. Information signals communicated on the cell-to-mobile link channels are encoded, interleaved, and modulated with orthogonal covering of each information symbol. Orthogonal Walsh function codes of varying length are employed to modulate the information signals. Code assignments are made on the basis of channel data rates in a manner which results in improved utilization of the available frequency spectrum. A substantially similar modulation scheme may be employed on the mobile-to-cell link.

REFERENCES:
patent: 3678204 (1972-07-01), Harmuth
patent: 4052565 (1977-10-01), Baxter et al.
patent: 4460992 (1984-07-01), Gutleber
patent: 4494228 (1985-01-01), Gutleber
patent: 5103459 (1992-04-01), Gilhousen et al.

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