Communication system using geographic position data
US6512481B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1996 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | Oct 10, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/53
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A wireless communication system employs directive antenna arrays and knowledge of position of users to form narrow antenna beams to and from desired users and away from undesired users to reduce co-channel interference. By reducing co-channel interference coming from different directions, spatial filtering with antenna arrays improves the call capacity of the system. A space division multiple access (SDMA) system allocates a narrow antenna beam pattern to each user in the system so that each user has its own communication channel free from co-channel interference. The position of the users is determined using geo-location techniques. Geo-location can be derived via triangulation between cellular base stations or via a global positioning system (GPS) receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.