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. 16, 2008
Filed:
Jul. 24, 2006
Ken Umeno, Koganei, Tokyo, JP;
Ken Umeno, Koganei, Tokyo, JP;
Other;
National Institute of Information and Communications Technology, Koganei-shi, JP;
Abstract
An FIR filter for filtering a prescribed real impulse constant (r) (−1<r<1) receives in a terminal the input of the input signal of the Chebyshev-chaos type spreading code sequence having a chip length D. A plurality of signals obtained by delaying the input signals by 0, D, 2D, 3D, . . . , and (N−1)D are output by a delay circuit. When the delay time is T, a plurality of delayed and output signals are multiplied by (−r)with an amplifier and output, and the sum of a plurality of amplified and output signals, namely an optimum chaos-type spreading code string, is output by an adder.