Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-09-11
2007-09-11
Tran, Khai (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
Reexamination Certificate
active
10681705
ABSTRACT:
Circuits are provided for transmitted reference spread spectrum systems using a noise-like digital sequence with delayed replica. The circuits produce the digital spreading sequences at extremely high speed, and are capable of providing a great degree of signal spreading. A first embodiment is composed of a low speed section and a high-speed section. This embodiment allows for greater power efficiency without sacrificing sequence speed. In addition, the embodiment also allows shaping of the spectrum of the high-speed digital sequence. Further, this embodiment generates an m-sequence and its near delay by storing decimated pieces of the entire m-sequence over a plurality of end-around circulating shift registers or so-called ring counters. The ring counters can be run at low speed and there is no exclusive-oring operation. A time-delayed transmitted reference spread spectrum transmitter is provided using digital noise generators that are capable of very high speed operation.
REFERENCES:
patent: 4760598 (1988-07-01), Ferrell
patent: 5761238 (1998-06-01), Ross et al.
patent: 6069915 (2000-05-01), Hulbert
patent: 2003/0145196 (2003-07-01), Heegard et al.
Hershey John Erik
Tomlinson, Jr. Harold Woodruff
Welles II Kenneth Brakeley
Fletcher Yoder
Tran Khai
LandOfFree
Time-delayed transmitted reference spread spectrum... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Time-delayed transmitted reference spread spectrum..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time-delayed transmitted reference spread spectrum... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3769342