Method and apparatus for location finding in a communication system
First Claim
1. A method for estimating a subscriber unit location in a communication system, the method comprising the steps of:
- receiving a signal from the subscriber unit at a first base station the signal being formed via modulation by a sequence of spreading symbols;
determining a first receive time of the signal based on the sequence of spreading symbols at the first base station,determining an estimate of a first angle of arrival of the signal at the first base station, the estimate being determined using a fixed beam antenna; and
determining the location of the subscriber unit from the first receive time, the first angle of arrival, and further predetermined information about the first base station.
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Accused Products
Abstract
A method for determining a subscriber unit location in a communication system is provided. The method includes the steps of receiving a signal from the subscriber unit at a first base station, determining a first receive time of the signal based on a sequence of spreading symbols at the first base station, determining a first angle of arrival of the signal at the first base station, and determining the location of the subscriber unit from the first receive time, the first angle of arrival, and further predetermined information about the first base station. The signal is formed via modulation by the sequence of spreading symbols.
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Citations
51 Claims
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1. A method for estimating a subscriber unit location in a communication system, the method comprising the steps of:
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receiving a signal from the subscriber unit at a first base station the signal being formed via modulation by a sequence of spreading symbols; determining a first receive time of the signal based on the sequence of spreading symbols at the first base station, determining an estimate of a first angle of arrival of the signal at the first base station, the estimate being determined using a fixed beam antenna; and determining the location of the subscriber unit from the first receive time, the first angle of arrival, and further predetermined information about the first base station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 40, 41, 42)
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39. A method for estimating a subscriber unit location in a communication system, the method comprising the steps of:
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performing a first location measurement having a first confidence level by; receiving a signal from the subscriber unit at a first base station, the signal being formed via modulation by a sequence of spreading symbols; determining a first receive time of the signal based on the sequence of spreading symbols at the first base station, and determining an estimate of a first angle of arrival of the signal at the first base station, the estimate being determined using a fixed beam antenna; performing a second location measurement having a second confidence level; determining an estimated location of the subscriber unit based on the first and second location measurements. - View Dependent Claims (43, 44)
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45. A communication system having plural base stations and operable for locating a communication unit, the communication system comprising:
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a controller responsive to a first and a second base station, each of the first and second base stations comprising a receiver operable for receiving a signal from the communication unit, the signal being formed via modulation by a sequence of spreading symbols, the receiver adapted to be coupled to an antenna having a limited angle of reception, the receiver configured to determine an estimate of a first angle of arrival of the signal and a detector operable for determining a receive time of the signal based on the sequence; and a location processor responsive to the controller operable for requesting the first and second base stations to determine first and second receive times of the signal based on the sequence, and for determining a location of the communication unit from the first and second receive times, the first angle of arrival of the signal, and further information about the first and second base stations.
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46. A wireless communication system, comprising:
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a first base station in wireless communication with a subscriber unit, the first base station receiving a signal from the subscriber unit, the signal being formed via modulation by a sequence of spreading symbols; a first time of arrival detector determining a first receive time of the signal based on the sequence of spreading symbols at the first base station, an angle of arrival detector adapted to be coupled to a fixed beam antenna, said angle of arrival detector determining a first angle of arrival of the signal at the first base station; and a location estimation unit determining an estimated location of the subscriber unit from the first receive time, the first angle of arrival, and further predetermined information about the first base station. - View Dependent Claims (47, 48, 49, 50, 51)
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Specification