초록 ▼

A technique for cyclic time hopping in a multiple access communication system, wherein each time frame of a TDMA system is divided into multiple time slots. A plurality of user stations, one for each time slot, communicate with a base station. Each user station regularly varies its relative time slo

A technique for cyclic time hopping in a multiple access communication system, wherein each time frame of a TDMA system is divided into multiple time slots. A plurality of user stations, one for each time slot, communicate with a base station. Each user station regularly varies its relative time slot position in a pseudo-random pattern. Orthogonal time hopping patterns are determined from a root pattern according to a predetermined equation or relationship. The effect of transmitting bursts in a pseudo-random pattern is to break up the otherwise strict periodicity of TDMA bursts, and to produce a more noiselike spectrum for switching transients, thereby reducing the level of interfering spectral components from a TDMA transmission source. In some embodiments, the time hopping pattern may be restricted to only odd or even time slots. In such embodiments, a dead time slot may be declared periodically so as to increase the apparent randomness of the user station transmission patterns. In a preferred embodiment, spread spectrum communication is employed for base station and user station transmissions.

대표청구항 ▼

[ What is claimed is:] [1.] A method for communicating comprising the steps of:generating a plurality of continuous time frames, dividing each of said time frames into a plurality of time slots;generating, using a root pattern based algorithm, a random pattern; andtransmitting, from a user station t

[ What is claimed is:] [1.] A method for communicating comprising the steps of:generating a plurality of continuous time frames, dividing each of said time frames into a plurality of time slots;generating, using a root pattern based algorithm, a random pattern; andtransmitting, from a user station to a base station, in a selected time slot of said plurality of time slots in said each time frame according to said random pattern;wherein said random pattern is generated by a modulo-n operation on said root pattern and an initial time slot assignment whereby another user station cannot occupy said selected time slot simultaneously in any given time frame within a cellular region.