The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 18, 2001
Filed:
Jun. 23, 1998
Tao Yang, Berkeley, CA (US);
Leon O. Chua, Berkeley, CA (US);
The Regents of the University of California, Oakland, CA (US);
Abstract
In the present invention, the structure, principle and framework of chaotic digital code-division multiple access ((CD),MA) communication systems are presented. Unlike the existing CDMA systems, (CD),MA systems use continuous pseudo-random time series to spread the spectrum of message signal and the spread signal is then directly sent through channel to the receiver. In this sense, the carrier used in (CD),MA is a continuous pseudo-random signal instead of a single tone as used in CDMA. The statistical properties of the noise-like carriers are given. In a (CD),MA system, every mobile station has the same structure and parameters, only different initial conditions are assigned to different mobile stations. Instead of synchronizing two binary pseudo-random sequences as in CDMA systems, an impulsive control scheme is used to synchronize two chaotic systems in (CD),MA. Simulation results show that the channel capacity of (CD),MA is at least twice as large than that of CDMA.