Communication system using geographic position data
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United States of America Patent
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Jul 15, 2003
Grant Date -
Jun 14, 2001
app pub date -
Nov 9, 1998
filing date -
Oct 10, 1996
priority date (Note) -
Expired
status (Latency Note)
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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. The system can be optimized by applying partially adaptive processing algorithms, which are seeded by geo-location data.
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