IS-136+ slot formation
US6445746B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1999 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Aug 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/20
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system and method for demodulating slots having a mixed slot formation including differential and coherently encoded slots is disclosed. The method includes pre-phase encoding data and a predetermined sequence in a slot at a transmitter such that the encoded data and the predetermined sequence have equal reference phases from a reference symbol of a previous slot having a reference phase. Another method includes pre-phase encoding the predetermined sequence with a phase determined from a reference symbol from the previous slot at the transmitter. Yet another method includes differentially phase encoding the predetermined sequence according to IS-136A standards using a reference phase of In another method pre-phase encoding data includes phase shifting data using one of a group of different phase angles, each of the different phase angles an integer multiple of Also, an IS-136 compatible receiver utilizing a 8-Phase Shifting-Key (8-PSK) slot structure for downlink communications, comprises a receiver for receiving a plurality of slots having a slot structure comprising: a SYNC sequence, data bits, and a plurality of reserved bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.