Overhead reduction in frequency hopping system for...

Details Overhead reduction in frequency hopping system for... Overhead reduction in frequency hopping system for...

2005-08-01

2008-11-04

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Spread spectrum

Frequency hopping

Reexamination Certificate

active

07447252

ABSTRACT:
A radio transmission telemetry system includes several transmitters intermittently transmitting short messages indicative associated sensors status and a receiver for collecting data from the sensors. Each transmitter changes time and frequency of transmissions according to a time-frequency pattern that is different for each transmitter. The receiver identifies each source of transmissions based on its unique variations of the transmission time and frequency, thus eliminating the necessity to include the transmitter ID code in each transmitted message. Thus, overhead in the transmissions is reduced. In addition, the sensor status and other supervisory information such as battery status are partitioned and included in the transmitted messages in portions and at different rates according to the state of the PN-generator for producing the time-frequency pattern. The receiver can determine what and when is included without additional control bits in the transmitted messages. Thus, overhead in the transmissions is further reduced.

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patent: 5428637 (1995-06-01), Oliva et al.
patent: 5960047 (1999-09-01), Proctor et al.
patent: 6018528 (2000-01-01), Gitlin et al.
patent: 6058137 (2000-05-01), Partyka
patent: 6188715 (2001-02-01), Partyka
patent: 6222440 (2001-04-01), Heller
patent: 6463040 (2002-10-01), Dutta
patent: 6535544 (2003-03-01), Partyka

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