Frequency-hopping radio communications system
First Claim
1. A radio communications system comprising at least one master station and a plurality of slave stations, wherein information to be transmitted between said stations is in digital form, wherein a two-way link between any of said slave stations and a master station is established over a frequency-hopping channel in which transmission takes place in bursts of predetermined duration at different frequencies with said frequency-hopping channel being determined by a frequency-hopping pattern which is associated with each slave station, each slave station having an independent frequency-hopping pattern associated therewith and all of said frequency-hopping channels using frequencies selected from a pool of frequencies common to all of said channels, and wherein useful transmission bursts are synchronized for the system as a whole with each slave station being synchronized from data received from a master station.
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Accused Products
Abstract
A radio communications system comprising at least one master station and a plurality of slave stations in two-way frequency-hopping communication therewith. For telephony, speech is digitally encoded. Digital data is transmitted in packets using successive bursts at different frequencies separated by intervals of silence. Each slave station has its own frequency-hopping pattern independent of the patterns of the other slave stations but sharing a common pool of available frequencies. The master stations are capable of generating any of the slave station patterns instantly. The master stations broadcast network time information for synchronization purposes, and the slave station patterns are determined by a combination of a slave station identification number and network time.
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12 Claims
- 1. A radio communications system comprising at least one master station and a plurality of slave stations, wherein information to be transmitted between said stations is in digital form, wherein a two-way link between any of said slave stations and a master station is established over a frequency-hopping channel in which transmission takes place in bursts of predetermined duration at different frequencies with said frequency-hopping channel being determined by a frequency-hopping pattern which is associated with each slave station, each slave station having an independent frequency-hopping pattern associated therewith and all of said frequency-hopping channels using frequencies selected from a pool of frequencies common to all of said channels, and wherein useful transmission bursts are synchronized for the system as a whole with each slave station being synchronized from data received from a master station.
Specification