Method and Apparatus for Configuring a RAKE Receiver
First Claim
1. A RAKE receiver with N fingers, the RAKE receiver comprising:
- a first stage, the first stage configured to use an input signal to find a set of more than N paths;
a second stage, the second stage configured to use the first set of more than N paths, the input signal and a quality signal from the RAKE receiver to generate a set of N paths, the second stage generates the set of N paths more frequently than the first stage generates the set of more than N paths; and
, a third stage, the third stage configured to use the set of N paths to configure the N fingers of the RAKE receiver.
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Abstract
A searcher uses an input signal, and for example, a matched filter to generate a first set of candidate paths. A selector uses the input signal and the first set of candidate paths to generate a second set of paths. The second set of paths is used to configure the fingers of a RAKE receiver. According to one aspect of the invention, the first set of candidate paths contains M paths, and the second stage uses M correlators to generate a set of M correlation values. The second stage uses the M correlation values to select N paths that are used to configure the N fingers of the RAKE receiver. According to another aspect of the invention, the first set of candidate paths contains M paths, and the second stage uses a multiple of M correlators to track the M paths and generate a set of M estimates. The second stage uses the M estimates to select N paths that are used to configure the N fingers of the RAKE receiver. According to another aspect of the invention, the selector can generate new sets of N paths while the searcher is either active or inactive. The receiver can use a quality signal or a counter to notify the searcher and/or the selector to generate new sets of paths. The selector decreases the need to continuously run the matched filter. The receiver can re-configure the fingers without having to search for new paths. The receiver can also find paths that are uncorrelated and less susceptible to fading.
14 Citations
14 Claims
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1. A RAKE receiver with N fingers, the RAKE receiver comprising:
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a first stage, the first stage configured to use an input signal to find a set of more than N paths;
a second stage, the second stage configured to use the first set of more than N paths, the input signal and a quality signal from the RAKE receiver to generate a set of N paths, the second stage generates the set of N paths more frequently than the first stage generates the set of more than N paths; and
,a third stage, the third stage configured to use the set of N paths to configure the N fingers of the RAKE receiver. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13)
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9. (canceled)
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14-25. -25. (canceled)
Specification