Method for detection of pilot tones
US6396883B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2001 |
| Grant date | May 28, 2002 |
| Priority date | — |
| Expiry date | Aug 15, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/22
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method identifies a pulse sequence having known values and a known length in a signal. According to this method, the mathematical sign of the phase difference between samples of the signal is used to estimate whether the transmitted pulse is a 1 or a 0. Undersampling, carried out to a selectable extent, produces a relatively insensitive response to adjacent channel interference. The sum of the pulses in a window which is proportional to the length of the pulse sequence and to the extent of the undersampling is determined, with the pulse sequence being regarded as being identified at the point in time at which the sum of the pulses in this search window exceeds a threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.