Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1998-07-10
2000-08-08
Nguyen, Chau
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
455457, 342357, H04J 300, H04Q 720, H04B 7185
Patent
active
061011789
ABSTRACT:
Ground-based pseudolites support accurate determination of mobile receiver locations by broadcasting CDMA signals interleaved by a TDMA system. Pseudolites synchronize signal transmissions with an accurate timing reference, such as can be derived from GPS satellites. Adjacent pseudolites broadcast CDMA signals at different times, eliminating near-far signal interference between pseudolites. A mobile receiver, typically a cellular telephone, receives and enables determination of times of arrival (TOA) of the pseudolite signals. A location processor associated with the mobile receiver may access an internal database of pseudolite locations, or pseudolite location information may be encoded in pseudolite transmissions. The location processor uses pseudolite location information and TOA to determine mobile receiver location. The TDMA pseudolite-based system may augment the GPS to provide more accurate location information than is available from the GPS alone.
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KSI Inc.
Lee Chiho Andrew
Nguyen Chau
LandOfFree
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