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:
Jul. 22, 2003
Filed:
Feb. 24, 1999
Feng Chen, Bethlehem, PA (US);
David L. Price, Coopersburg, PA (US);
Agere Systems Inc., Berkley Heights, NJ (US);
Abstract
A method for a cellular telephone receiver to detect the presence of a dotting sequence for a Manchester encoded cellular signal in a deep fading environment, wherein the presence of a single edge transition during the mask pulse for a predetermined number of consecutive clock cycles and the absence of any transition edges outside of the mask pulse for the predetermined number of consecutive clock cycles, indicate the presence of a dotting sequence and that the cellular receiver locked to a masked edge, thereby preventing the receiver from receiving the signal. In response, the receiver will shift the phase of its clock by 180 degrees so that it can lock to an unmasked edge of the cellular signal and thereby receive the signal. By contrast, the absence of any transition edges or the presence of more than one transition edge during the mask pulse indicates that the receiver is not receiving the cellular signal because of deep fading and not because it locked to a masked edge of the signal during the dotting sequence. In response, the receiver will not shift the phase of its clock, but will instead remain locked to an unmasked edge so that it can receive the cellular signal once the deep fading ceases.