Cryptography – Communication system using cryptography – Symmetric key cryptography
Reexamination Certificate
2005-12-27
2005-12-27
Zand, Kambiz (Department: 2132)
Cryptography
Communication system using cryptography
Symmetric key cryptography
C380S257000, C380S259000, C380S260000, C380S277000
Reexamination Certificate
active
06980656
ABSTRACT:
A chaotic communication system employs transmitting and receiving chaotic oscillating circuits. One improvement to first-generation systems is the ability to modulate a nonreactive element in the transmitting circuit, thus increasing modulation bandwidth. Other features include insertion of a gain control amplifier in a chaotic receiver; signal filtering in chaotic transmitters and receivers; use of chaotic modulation techniques for cellular telephony applications; dual-transmitter and receiver systems; a dual receiver synchronization detector; interfaces to communication systems; analog chaotic signal modulation; use of multiple chaotic transmitters and receivers; digital algorithm improvement using a cube-law nonlinear component; a Gb-only receiver; a Gb-only transmitter; and positive slope transmitter and receiver systems.
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Berkley Antwong L.
Bowser Steven M.
Dew Nelson R.
Edwards Michael C.
Gardner Charles P.
Banner & Witcoff , Ltd.
Science Applications International Corporation
Zand Kambiz
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