System and method for recovering system time in direct sequence spread spectrum communications
US7403507B2 · kind B2 · utility
6Cited by
10References
42Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Jul 22, 2008 |
| Priority date | — |
| Expiry date | Feb 1, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70709
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A sleep control system and method are provided that permit a reference clock and the direct sequence spread spectrum (DSSS) modem in a mobile station receiver to be turned off and turned back on at arbitrary points in time while still maintaining accurate base station system time. Accurate timing is made possible through a number of techniques including precise initial calibration using a rising edge/falling edge averaging system, determining the sleep clock and reference clock frequencies, and the determination of the frequency drift of the sleep clock that occurred during the previous sleep interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.