Space diversity system in TDMA communication system
US4218654A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1979 |
| Grant date | Aug 19, 1980 |
| Priority date | — |
| Expiry date | Feb 21, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/2125
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A space diversity system in a TDMA communication system employing a communication satellite, in which in order to equalize the path lengths of respective sending paths at the start of communication, a pre-burst is sent out to one of the paths making up the diversity system in a time slot of one frame assigned to an instant station. A sub-burst is sent out to the other of the paths in the assigned time slot. A relative time difference between the pre-burst and the sub-burst is detected from signals sent back to the instant station from the communication satellite or signals received by a distant terrestral station via the communication satellite. On the basis of the result of a comparison operation of relative time difference between the pre-burst and the sub-burst at the time of their sending-out from the instant station with a relative time difference between the pre-burst and the sub-burst received via the communication satellite, variable delay means inserted in one of the paths is controlled so that the two relative time differences become equal to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.