Method of tracking time intervals for a communication signal
US6795452B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 2002 |
| Grant date | Sep 21, 2004 |
| Priority date | — |
| Expiry date | Mar 18, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7085
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved tracking system, illustrated as a delayed lock loop. The time intervals of a communication signal are tracked by first sampling the communication signal. A standard and a sample, advanced relative to each other by i sample positions from a sample position representing an assumed arrival position ta of a time interval, are correlated over a correlating length of k samples. Also, the standard and a sample retarded relative to each other by the i sample positions from the assumed arrival time ta are also correlated over k samples. A timing error is determined from the correlations. A predication of the arrival time tp of the next interval is determined from the error. One or more of the correlation length k or the i sample position is modified based on the predicated arrival time tp. The process is repeated using any of the modified correlation length k and/or sample position i. The timing error may also be used for descrambling and despreading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.