Method for detecting a dotting sequence for manchester encoded data in a deep fading environment
US6597752B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1999 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Feb 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4904
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.