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:
Aug. 25, 1998
Filed:
Jun. 02, 1997
Chun-Ye Susan Chang, Boca Raton, FL (US);
James Rodney Webster, Boynton Beach, FL (US);
Clinton C Powell, II, Lake Worth, FL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A selective call unit (800) comprising a receiver (100) and a processor (810) is used for decoding a 2-level radio signal. The processor (810) is adapted to convert in-phase and quadrature signals generated by the receiver (100) to a sequence of state transitions representative of the plurality of symbols. For each symbol in the plurality of symbols, the processor (810) counts the sequence of state transitions during a symbol period, and compares the recorded count to a predetermined threshold, thereby generating a comparison result. The processor (810) then calculates a bit decision threshold level based on an average of the comparison result for each symbol in the plurality of symbols. For each symbol in a plurality of subsequent symbols, the processor (810) then compares the bit decision threshold level to the sequence of state transitions counted during a symbol period to decode a digital logic level therefrom.