Base station with slave antenna for determining the position of a mobile subscriber in a CDMA cellular telephone system
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United States of America Patent
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Feb 27, 2001
Grant Date -
N/A
app pub date -
Jun 6, 1996
filing date -
Jun 6, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for determining the position of a mobile station using a base station having three antennas. The first antenna is used to transmit a first signal modulated with a first preassigned Walsh code. The second antenna is used to transmit a second signal modulated with a second preassigned Walsh code. A third antenna is used to transmit a third signal modulated with a third preassigned Walsh code. Each of the three signals is also modulated with a common spreading code in addition to the first, second and third Walsh codes. Each of the three signals are received by the mobile station. The mobile station determines the time of arrival of each such signal. Based upon these relative times of arrival, the mobile station determines its location.
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