Process for synchronizing a receiver switching circuit to a received signal containing a pn-code-spread data signal
US5436935A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1993 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Sep 13, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7085
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A synchronizing circuit comprises a controllable timer (9) and a PN-code generator (10) controllable thereby with at least three outputs (11.1, 11.2, 11.3), for the production of at least three PN-code signals phase-shifted with respect to one another. The PN-code signals phase-shifted with respect to one another are correlated, in parallel correlation paths, with the received signal. Upon the presence of a time drift, the phase position of the trailing PN-code signal, for example, is changed so that this signal is now leading. Thereby, the control range is shifted. At the same time, reassignment is effected between the correlation path and the demodulating output in such a way that in all cases the correlation path that is in the middle with respect to time and that has the maximum correlation power is utilized for demodulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.