Frequency hopping system for intermittent transmission
First Claim
1. A wireless telemetry system comprising:
- a plurality of transmitters, each of which is for transmitting intermittently radio frequency transmissions independently of any apparatus for receiving any of said transmissions, and a receiver for holding, simultaneously for each of said plurality of transmitters, time data indicative of an expected time of at least one future transmission.
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Accused Products
Abstract
A radio transmission system including many radio transmitters using frequency hopping carriers to intermittently transmit very short messages indicative of status of stimuli associated with the transmitters. The transmitters transmit transmissions independently of a receiver receiving the transmissions and independent of each other. In operation, radio transmitters transmit messages at varying frequencies at time intervals that can be varied as well. The frequency and time intervals are varied according to patterns that can be determined individually for each transmitter. A receiver holds data indicative of the future transmission frequency and time for each transmitter and updates the data based on the time and the content of the received messages. In addition, a simple method is provided to generate a very large number of orthogonal frequency-time hopping sequences that are individual for each transmitter and based on the transmitter ID.
27 Citations
15 Claims
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1. A wireless telemetry system comprising:
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a plurality of transmitters, each of which is for transmitting intermittently radio frequency transmissions independently of any apparatus for receiving any of said transmissions, and a receiver for holding, simultaneously for each of said plurality of transmitters, time data indicative of an expected time of at least one future transmission. - View Dependent Claims (2, 3, 4, 5, 13)
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6. A telemetry receiver comprising:
logic for holding, simultaneously for each plurality of radio frequency transmissions, data indicative of an expected time of at least one future transmission, wherein each said plurality of radio frequency transmissions is transmitted by a different one of a plurality of transmitters, and wherein each of said plurality of transmitters is for transmitting intermittently, independently of any receiver for receiving any of said transmissions. - View Dependent Claims (7, 8, 9, 10)
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11. A telemetry transmitter comprising:
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a circuit for transmitting intermittently radio frequency transmissions, at varied transmission frequency, independently of any apparatus for receiving any of said transmissions, and logic for varying said transmission frequency according to a frequency index varied in such a way that, upon each transmission, for at least one future transmission, said frequency index is predictable based on frequency index of at least one past transmission. - View Dependent Claims (12, 14, 15)
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Specification