Radio positioning systems
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United States of America Patent
Stats
-
May 17, 2005
Grant Date -
Oct 7, 2004
app pub date -
Jul 15, 2002
filing date -
Jul 17, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention sets out to overcome the hearability problem in CDMA communications networks in which positioning services are provided, by using a separate sampling device (204, 205, 206) for each transmitter (201, 202, 203), which sends to the computing device (208) a representation of the signals transmitted only by that transmitter. A cross-correlation of the representation sent back by the mobile terminal (207) with the representation sent back by the sampling device in the brightest transmitter is performed in the computing device (208), and an estimate of that brightest signal is subtracted from the representation sent back by the mobile terminal (207) in order to reduce its effect on the remaining signals as far as possible. The cross-correlation and subtraction steps are iterated until no useful signals remain to be extracted.
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