Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2005-04-05
2005-04-05
Burd, Kevin M. (Department: 2631)
Pulse or digital communications
Spread spectrum
Frequency hopping
Reexamination Certificate
active
06876691
ABSTRACT:
A frequency hopping system comprises a transmitting station and a receiving station, both stations storing a frequency hopping sequence comprising a predetermined sequence of N frequencies, where N is an integer greater than 2. In order for the receiving station to acquire synchronization with the transmitter which is continuously hopping through the sequence of frequencies, the receiver initiates a search by tuning to one of the N frequencies and checking if that frequency corresponds to the currently transmitted frequency during that hop period. If it does not correspond, the receiver eliminates the phase of hopping sequence associated with that frequency and tunes to another of the N frequencies with the exception of the next frequency in the eliminated phase and checks for correspondence. If there is not correspondence then the phase of the hopping sequence associated with that frequency is also eliminated from the search. The search is continued with the progressive elimination from the search of those phases found to be unacceptable until a phase which matches the transmitted phase is found and the search is terminated.
REFERENCES:
patent: 5339331 (1994-08-01), Beauchamp et al.
patent: 5471503 (1995-11-01), Altmaier et al.
patent: 5663957 (1997-09-01), Dent
Waseem W S Jibrail et al: “Performance Analysis of Two Serial-Search Acquistion Schemes for FH Spread Signals” International Journal of Electronics, GB, Taylor and Francis. LTD. London, vol. 75, No. 6, Dec. 1, 1993, pp. 1083-1097.
Burd Kevin M.
Halajian Dicran
Koninklijke Philips Electronics , N.V.
Slobod Jack D.
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