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:
Jun. 15, 2004
Filed:
Jul. 24, 2000
Michael H. Myers, Poway, CA (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
An apparatus for and a method of generating an envelope predistorted radio frequency signal. A complex baseband signal, having an in-phase component I and a quadrature component Q, is sampled and filtered. The magnitude u of each complex baseband sample pair is determined by the square root of the sum of the squares of the in-phase component sample and the quadrature component sample. A distortion factor D , is determined based on a scaled value of the inverse hyperbolic tangent or archyperbolic tangent (“atanh”) of the baseband sample magnitude divided by that scaled sample magnitude. Each sample of the in-phase component I and of the quadrature component Q is multiplied by the corresponding distortion factor D so as to provide predistorted components. The predistorted components are then combined to provide a predistorted baseband signal.