Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2005-11-08
2005-11-08
Gregory, Bernarr E. (Department: 3662)
Pulse or digital communications
Spread spectrum
Frequency hopping
C375S130000, C375S135000, C375S136000
Reexamination Certificate
active
06963599
ABSTRACT:
An improved spread spectrum communications system is disclosed in which M-ary symbols are defined corresponding to each state of digital data to be transmitted and in which each of those M-ary symbols are represented by a plurality of tones selected from a set of N frequencies. A different plurality of tones out of the set N is established to represent each of the M-ary symbols during each successive timing interval, with selection of the tones comprising each such plurality of tones being determined in accordance with a known coding pattern. Phasing of the tones comprising each such plurality is also determined in accordance with a known coding sequence. After selection of the symbol corresponding to the data to be transmitted during a given timing interval, the frequency domain representation of the plurality of tones corresponding to that symbol is converted to the time domain for transmission. That time domain signal is converted back to the frequency domain by the receiver and the resultant signal processed by M-ary signal correlators synchronized with coding established by the transmitter to determine the transmitted symbol.
REFERENCES:
patent: 4222115 (1980-09-01), Cooper et al.
patent: 5166953 (1992-11-01), Hershey et al.
patent: 5173923 (1992-12-01), Crespo et al.
patent: 5210770 (1993-05-01), Rice
patent: 5267271 (1993-11-01), Rice
patent: 2252017 (1992-07-01), None
patent: 0120735 (1987-06-01), None
Gregory Bernarr E.
ITT Manufacturing Enterprises Inc.
LandOfFree
Multitone frequency hop communications system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multitone frequency hop communications system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multitone frequency hop communications system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3521605