Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2007-11-27
2007-11-27
Kim, Kevin (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S357000, C340S870110
Reexamination Certificate
active
10389860
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.
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