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:
Mar. 27, 1984
Filed:
Nov. 28, 1980
John C Bellamy, Dallas, TX (US);
Rockwell International Corporation, El Segundo, CA (US);
Abstract
A simple system is disclosed for detecting an 8 PSK (Phase Shift Keyed) - PRS (Partial Response System) signal output set, and other multi-level PSK and APSK (Amplitude and Phase Shift Keyed) - PRS signal sets. Quadrature interdependent channel decision feedback translates a reduced output signal set which is a scaled down version of the original full response input signal set before partial response filtering. The reduced output signal set has the same number of points and the same distribution array pattern as the input signal set. This enables the use of a conventional detector which need only detect the reduced signal set, not the complete output signal set. A decoder controls selection of predetermined interdependent signal value adjustments for each channel to translate the reduced output signal set in accordance with each successive signal relative to the then current signal value.