Rapid synchronization for communication systems
US5818832A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 1996 |
| Grant date | Oct 6, 1998 |
| Priority date | — |
| Expiry date | Oct 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W74/04
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A local multipoint data distribution system (10) simultaneously accommodates many communication sessions occurring at a variety of data rates. Space surrounding cell sites (12) is partitioned into sectors (16), and the spectrum is allocated so that adjacent sectors (16) use different spectrum portions, but the entire spectrum is reused numerous times. A time diversity scheme allocates different numbers of time slots (54) to different calls. Time slot identifiers are assigned in contiguous blocks in an assigned numbering system (56). The time slot identifier assignments are translated into a counted numbering system (58) which causes the time slots (54) for any call to be distributed throughout a frame (48) and interleaved with time slots (54) assigned to other calls. Data communications use a common modulation format and a modulation order that is specifically adapted to a particular call. A spectral coherence technique causes reverse channel signal (158) to be transmitted at a frequency to which a base station demodulator (170) is already synchronized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.