Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-12-18
2007-12-18
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S130000, C375S146000, C375S147000, C375S222000, C375S265000, C375S340000
Reexamination Certificate
active
10421081
ABSTRACT:
A modulation channelization and demodulation system based on orthogonal bipolar spreading vectors is provided that permits a variable information rate to be transmitted without inducing envelope fluctuations and permits multiple access without requiring the transmitter amplifiers to support the combined information rate of all users. The modulation system uses the vectors of a Hadamard matrix to form communication channels. The information rate on any channel may be doubled by using half the vector length to transmit information. The vector that is not non-orthogonal-in-the-half to the rate-doubled vector is preferably deactivated. In the same fashion, higher information rates may be provided through truncation of the transmission vector and the elimination of the resultant non-orthogonal vectors. A multi-channel receiver including a Fast Hadamard Transform structure comprised of controllable modified logic cells for performing the multi-rate communication of the present invention is illustrated. A multi-channel transmitter for performing the present invention is also shown.
REFERENCES:
patent: 4613976 (1986-09-01), Sewerinson
patent: 5241541 (1993-08-01), Farrell et al.
patent: 5619525 (1997-04-01), Wiedeman
patent: 5696762 (1997-12-01), Natali
patent: 6005855 (1999-12-01), Zehavi et al.
patent: 7002901 (2006-02-01), Yun et al.
patent: 2003/0123384 (2003-07-01), Agee
patent: 0 993 127 (2000-04-01), None
Peterson R.L. et al., “Biothogonal Multicode Modulation for High-Rate-Reliability Personal Communications Requiring Controlled Peak-to-Average Tranmit Power Ratio”, Broadband Communications, Zurich, Switzerland, Feb. 15, 2000, pp. 263-269.
Harri Holma, Antti Toskala, “WCDMA for UMTS”, John Wiley & Sons, West. Sussex, England, 2000, pp. 79-80.
No J-S et al., “Performance Analysis of CDMA Systems by Using Biorthogonal Codes”, Asia Pacific Conference on Communications, vol. 1, 1995, pp. 326-330.
Linsky Stuart T.
Simmons, legal representative Victoria E.
File Erin M.
Miller John A.
Miller IP Group, PLC
Northrop Grumman Corporation
Payne David C.
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