Split-window time alignment
US5229996A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1992 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Jul 21, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L7/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Synchronization is maintained between a regional radio transmitter/receiver and a remote transmitter/receiver communicating across a TDMA channel by detecting time misalignment of communications from the remote transmitter/receiver to the regional transmitter/receiver, commanding the remote transmitter/receiver to adjust its transmission timing, and, until the remote transmitter/receiver has adjusted its transmission timing, looking for a synchronization pattern accompanying transmissions by the remoter transmitter/receiver during two discontinuous time intervals, one centered about a time of occurrence of the synchronization pattern before the command and another centered about an expected time of occurrence of the synchronization pattern in response to the command. Effectively, what would otherwise be a disadvantageously wide time window is split into two advantageously narrow time windows to avoid detection of false syncs. Fewer false syncs are detected, and speech quality is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.