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:
May. 09, 2000
Filed:
Nov. 21, 1997
Hiroshi Itahara, Atsugi, JP;
Anritsu Corporation, Tokyo, JP;
Abstract
A digital communication system modulated signal generation apparatus incorporates a fading simulator for adding fading to a signal to be transmitted to a device to be tested. A baseband signal generation unit generates a digital baseband signal at a predetermined clock rate, and sequentially outputs time information corresponding to the predetermined clock rate. A fading parameter generation unit receives the time information sequentially output from the baseband signal generation unit together with the digital baseband signal, and output a desired fading parameter set in advance in correspondence with the time information. A fading addition operation unit executes a fading addition operation for the digital baseband signal output from the baseband signal generation unit by using the desired fading parameter output from the fading parameter generation unit, and outputs a signal indicating the result. A digital/analog conversion unit D/A-converts the signal output from the fading addition operation unit. A quadrature modulation unit quadrature-modulates the signal converted by the digital/analog conversion unit, and outputs the quadrature-modulated signal as a modulated signal.