PN sequence hopping method and system

Details PN sequence hopping method and system PN sequence hopping method and system

1997-11-13

1999-11-16

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

375203, H04B 166

Patent

active

059870567

ABSTRACT:
A novel method for PN sequence hopping where a PN sequence generator has been disabled for a predetermined time before a future time slot where the PN sequence generator will be enabled. The method comprises the steps of writing a base state into storage for a first hop only, calculating from the base state a new state advancing a PN sequence to the beginning of the future time slot, loading the new state into the PN sequence generator, and enabling the PN sequence generator. For subsequent hops, the base state is the new state calculated in the previous hop. In a preferred version, the step of calculating a new state comprises multiplying the base state by a Galois Field polynomial; a serial Galois Field multiplier can be used to perform this multiplication. A system embodying the present invention comprises a PN sequence generator, a control processor, and a storage device. At a desired time after storing the base state, the PN sequence generator is disabled for a predetermined time before a future time slot where the PN sequence generator will be enabled. The control processor calculates a new state advancing a PN sequence to the beginning of the future time slot, and loads the new state into the PN sequence generator, which is subsequently enabled. The PN sequence generator writes the new state into the storage device for a first hop only; for subsequent hops, the base state is the new state calculated in the previous hop.

REFERENCES:
patent: 5291475 (1994-03-01), Bruckert
patent: 5793975 (1998-08-01), Li
patent: 5910944 (1999-06-01), Callicotte et al.

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