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:
Apr. 22, 2003
Filed:
Feb. 18, 1999
Juichi Nakada, Tokyo, JP;
Advantest Corporation, Tokyo, JP;
Abstract
According to the present invention, the inputted spectrum diffusion signal is orthogonal-transformed ( ), and then, the common mode output Zre and the orthogonal mode output Zim are respectively AD-transformed ( ). Zre and Zim are respectively inputted to series connections of delay units respectively having a sampling period, and the corresponding delayed outputs are complex-multiplied ( ). Each output is N-points-complex-Fast-Fourier-transformed, and the absolute value of the each coefficient is squared. The squared absolute value is two-dimensionally displayed by setting a horizontal axis as a frequency axis and a longitudinal axis as a time axis ( ). Then, a carrier wave frequency error is obtained from the maximum peak of the frequency, and a timing phase is obtained from the time.