Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2007-05-29
2007-05-29
Tran, Khanh (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S136000, C455S500000, C455S502000
Reexamination Certificate
active
09741411
ABSTRACT:
A telemetry system includes many radio transmitters using frequency hopping carriers to intermittently transmit transmissions indicative of status of sensors associated with the transmitters. The transmitters transmit transmissions independently of a receiver receiving the transmissions and independently of each other. The carrier frequency and the time between transmissions are changed according to a frequency-time hopping sequence that is different for each transmitter. The sequences and the resulting frequency ad time hopping are predictable and can be reproduced in the receiver based on the transmitter ID number. The system also includes one or more receivers containing a plurality of memory registers to hold, simultaneously for each transmitter, digital data indicative of (a) expected time and (b) expected frequency of the next transmission occurrence. The data is updated based on the time and the content of the received transmissions. The receiver authenticates the received transmissions by discriminating transmissions received at a wrong frequency and time. In addition, each transmitter encrypts the transmission using a variable encryption key that is varied with each transmission. The key variations are based on the frequency and time hopping sequence and are different for each transmitter. Alternatively, prior to encryption, each transmitter modifies data for transmission, using a modifier that is varied based on the frequency and time hopping sequence that is different for each transmitter. In addition, for faster acquisition and robust operation, the receiver includes and RSSI circuit based on FFT to detect transmitted carrier power at several different frequencies. The receiver also includes one or more frequency selective circuits that are tuned in response to the outputs from FFT and the status of the time and frequency registers.
REFERENCES:
patent: 3609729 (1971-09-01), Anderson
patent: 4040054 (1977-08-01), Overman
patent: 4435821 (1984-03-01), Ito et al.
patent: 4606041 (1986-08-01), Kadin
patent: 4612652 (1986-09-01), Kadin
patent: 4614945 (1986-09-01), Brunius et al.
patent: 4653068 (1987-03-01), Kadin
patent: RE32905 (1989-04-01), Baran
patent: 4843638 (1989-06-01), Walters
patent: 4862493 (1989-08-01), Venkataraman et al.
patent: 5079768 (1992-01-01), Flammer
patent: 5121407 (1992-06-01), Partyka et al.
patent: 5121408 (1992-06-01), Cai et al.
patent: 5179569 (1993-01-01), Sawyer
patent: 5204855 (1993-04-01), Bebee et al.
patent: 5222142 (1993-06-01), Kent
patent: 5287384 (1994-02-01), Avery et al.
patent: 5309448 (1994-05-01), Bouloutas et al.
patent: 5390166 (1995-02-01), Rohani et al.
patent: 5400246 (1995-03-01), Wilson et al.
patent: 5408506 (1995-04-01), Mincher et al.
patent: 5414731 (1995-05-01), Antunes et al.
patent: 5428602 (1995-06-01), Kemppainen
patent: 5428637 (1995-06-01), Oliva et al.
patent: 5436935 (1995-07-01), Bernhard et al.
patent: 5438329 (1995-08-01), Gasouniotis et al.
patent: 5442659 (1995-08-01), Bauchot et al.
patent: 5517187 (1996-05-01), Bruwer et al.
patent: 5532702 (1996-07-01), Mintz
patent: 5546422 (1996-08-01), Yokev et al.
patent: 5548582 (1996-08-01), Brajal et al.
patent: 5553094 (1996-09-01), Johnson et al.
patent: 5586141 (1996-12-01), Ashdown et al.
patent: 5595342 (1997-01-01), McNair et al.
patent: 5610907 (1997-03-01), Barrett
patent: 5657343 (1997-08-01), Schilling
patent: 5659303 (1997-08-01), Adair, Jr.
patent: 5668828 (1997-09-01), Sanderford, Jr. et al.
patent: 5719564 (1998-02-01), Sears
patent: 5748100 (1998-05-01), Gutman et al.
patent: 5748103 (1998-05-01), Flach et al.
patent: 5852409 (1998-12-01), Bell
patent: 5854994 (1998-12-01), Canada et al.
patent: 5914672 (1999-06-01), Glorioso et al.
patent: 5919667 (1999-07-01), Gage et al.
patent: 5937002 (1999-08-01), Anderson et al.
patent: 5956621 (1999-09-01), Weiss 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: 6144693 (2000-11-01), Tabeta
patent: 6188715 (2001-02-01), Partyka
patent: 6195018 (2001-02-01), Ragle et al.
patent: 6222440 (2001-04-01), Heller
patent: 6223048 (2001-04-01), Noll Barreto et al.
patent: 6333975 (2001-12-01), Brunn et al.
patent: 6377609 (2002-04-01), Brennan, Jr.
patent: 6389057 (2002-05-01), Haarsten
patent: 6463040 (2002-10-01), Dutta
patent: 6466138 (2002-10-01), Partyka
patent: 6466608 (2002-10-01), Hong et al.
patent: 6535544 (2003-03-01), Partyka
patent: 6567459 (2003-05-01), Hakkinen et al.
patent: 6700920 (2004-03-01), Partyka
patent: 6728293 (2004-04-01), Partyka
patent: 6731223 (2004-05-01), Partyka
patent: 6760319 (2004-07-01), Gerten et al.
patent: 6778521 (2004-08-01), Korpela et al.
patent: 6870875 (2005-03-01), Partyka
patent: 6894975 (2005-05-01), Partyka
patent: 6925105 (2005-08-01), Partyka
patent: 6967974 (2005-11-01), Partyka
patent: 2002/0027504 (2002-03-01), Davis et al.
Robert C. Dixon, “Spread Spectrum Systems”, Johm Wiley & Sons, 1984 ISBN 0-471-88309-3, pp. 52-54, 217-235.
Marvin K. Simon, et al., “Spread Spectrum Communications”, Computer Science Press, 1885. ISBN 0-88175-017-4, vol. 1, pp. 352-358, vol. 3, pp. 386-398.
Don J. Torrieri, “Principles of Secure Communication Systems”, Artech House 1985, ISBN 0-89006-139-4. pp. 212-215, 132, 148-150, 134-145, 92-97.
Kamilo Feher, “Digital Communications: microwave applications”, Prentice-Hall Inc., 1981, ISBN 0-13-214080-2. pp. 155, 156-161, 163-165.
European Patent Application No. 0 629 098 A2—Bishop.
EP 0651362 A1—Grundig E.M.V—Abstract, Abstract—p. 1.
WO 01/33796 A1—Zeus Wireless—Abstract, Abstract—p. 1.
PCT Publication No. WO 01/84735 A1—Partyka.
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