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:
Oct. 11, 1977
Filed:
Nov. 26, 1976
Applicant:
Inventors:
Carl R Ryan, Mesa, AZ (US);
James H Stilwell, Scottsdale, AZ (US);
Assignee:
Motorola Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H / ;
U.S. Cl.
CPC ...
325323 ; 333 18 ;
Abstract
A quadriphase shift keyed (QPSK) adaptive equalizer includes baseband inphase (I) and quadrature (Q) adaptive filters for receiving demodulated OPSK signals. The I and Q channel filters are designed to operate independent of each other and adapt their characteristics continuously in a predetermined manner in response to an incoming received QPSK signal, distorted in an unknown time varying manner.