Wireless PBX/LAN system with optimum combining
US4639914A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1984 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Dec 6, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A wireless PBX or LAN system is disclosed that allows multiple, simultaneous users per channel for communication between a base station and a plurality of remote terminals by a combination of adaptive signal processing arrays using optimum combining at the base station for interference suppression and separation of desired signals, adaptive power control at the remote terminals to keep interference at acceptable levels, and adaptive retransmission with time division in the direction from the base station to the remote terminals for communication therebetween including sending power control information to the remote terminals. The adaptive signal processing arrays have a plurality of antennas at the base station, permitting a plurality of users in any one channel. If after adaptation a user's signal cannot be received adequately, the user is dynamically reassigned to a different channel. Interference is minimized by keeping the signals transmitted from and received at the base station at the same power level. The received signals are kept at the same power level by extracting information about the power level of the signals received at the base station and by sending power control b…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.