Procedure for seizing the beginning of an active signal section
US7283600B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Oct 16, 2007 |
| Priority date | — |
| Expiry date | Nov 20, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/027
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A process for detecting initiation (BB) of an active packet or burst in a digital received signal r(v) during use of a digital reference signal p(v) includes: (a) executing a correlation (S102, S103) by forming a cost function L(v0) with a correlation function within a correlation function interval dependent upon a time delay of the received signal r(v) relative to a bit offset or a chip offset v0 characterized by reference signal p(v), whereby the addends of the correlation function were multiplied with a frequency offset correction factor, namely e−j2πΔ{tilde over (f)}v, which factor was characterized with a frequency offset Δf of received signal r(v) relative to the reference signal p(v); and (b) seeking a maximum Max(L) of cost function L(v0) dependent upon the bit offset or the chip offset v0 and upon the approximate frequency offset Δ{tilde over (f)} whereby maximum Max(L), following a discrete Fourier Transform (FFT) is sought in the frequency space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.