Communication System Determining Time of Arrival Using Matching Pursuit
First Claim
1. A method of determining time of arrival in a wireless network, comprising:
- receiving at a receiver from a wireless network a request for time of arrival information;
extracting location pilot symbols from a received signal;
identifying a first path associated with the location pilot symbols using matching pursuit;
determining a time of arrival based on the first path identified using matching pursuit estimation; and
communicating information responsive to the time of arrival based on the first path from the receiver to the wireless network.
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Accused Products
Abstract
A wireless receiver receives location pilots embedded in received symbols and uses the location pilots to detect the first path for every base station the network has designated for the receiver to use in time of arrival estimation. The receiver preferably applies matching pursuit strategies to offer a robust and reliable identification of a channel impulse response'"'"'s first path. The receiver may also receive and use estimation pilots as a supplement to the location pilot information in determining time of arrival. The receiver can use metrics characteristic of the channel to improve the robustness and reliability of the identification of a CIR'"'"'s first path. With the first path identified, the receiver measures the time of arrival for signals from that path and the receiver determines the observed time difference of arrival (OTDOA) to respond to network requests for OTDOA and position determination measurements.
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Citations
26 Claims
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1. A method of determining time of arrival in a wireless network, comprising:
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receiving at a receiver from a wireless network a request for time of arrival information; extracting location pilot symbols from a received signal; identifying a first path associated with the location pilot symbols using matching pursuit; determining a time of arrival based on the first path identified using matching pursuit estimation; and communicating information responsive to the time of arrival based on the first path from the receiver to the wireless network. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21)
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17. A method of determining time of arrival in a wireless network, comprising:
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receiving at a receiver from a wireless network a request for time of arrival information; extracting pilot symbols from a received signal; identifying a first path associated with the extracted pilot symbols using matching pursuit; determining a time of arrival based on the first path identified using matching pursuit estimation; and communicating information responsive to the time of arrival based on the first path from the receiver to the wireless network.
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22. A receiver having a time of arrival function, the receiver comprising:
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memory coupled to store extracted pilot symbols; an interpolator coupled to receive the extracted pilot symbols and to generate virtual pilot symbols; a multi-symbol correlator that correlates the extracted pilot symbols and the virtual pilot symbols with a reference signal and outputs an initial pilot channel impulse response; a matching pursuit estimator providing a channel impulse response estimate responsive to the initial pilot channel impulse response; and a time of arrival estimator responsive to the matching pursuit estimator to identify a first path and to determine a time of arrival for the first path. - View Dependent Claims (23, 24, 25, 26)
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Specification