Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system
First Claim
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1. A method implemented in a communication device for tracking a spread spectrum signal having an associated code at a receiver, the method comprising:
- despreading by a despreading device a plurality of components of the spread spectrum signal using the associated code, each of the plurality of components having a different code phase than all others of the plurality of code phases;
weighting each of the plurality of components with a weight value based on a phase difference between that component and a center code phase of the plurality of components; and
determining a tracking error based on the weighted components.
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Abstract
A spread spectrum signal having an associated code is tracked at a receiver. A plurality of components of the spread spectrum signal are despread using the associated code. Each of the plurality of components has a different code phase than all others of the plurality of code phases. Each of the plurality of components is weighted based on a phase difference between that component and a center code phase associated with the plurality of components. A tracking error is determined based on the weighted components.
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Citations
12 Claims
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1. A method implemented in a communication device for tracking a spread spectrum signal having an associated code at a receiver, the method comprising:
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despreading by a despreading device a plurality of components of the spread spectrum signal using the associated code, each of the plurality of components having a different code phase than all others of the plurality of code phases; weighting each of the plurality of components with a weight value based on a phase difference between that component and a center code phase of the plurality of components; and determining a tracking error based on the weighted components. - View Dependent Claims (2, 3, 4)
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5. A circuit for tracking a spread spectrum signal having an associated code, the circuit comprising:
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an input configured to receive a received signal; a despread device configured to despread the received signal to produce a plurality of components of the spread spectrum signal using the associated code, each of the plurality of components having a different code phase than all others of the plurality of components; and a weight device configured to weigh each of the plurality of components with a weight value based on a phase difference between that component and a center code phase of the plurality of components, and to determine a tracking error based on the weighted components. - View Dependent Claims (6, 7, 8)
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9. A circuit for tracking a spread spectrum signal having an associated code, the circuit comprising:
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an input configured to receive a received signal; a plurality of adaptive matched filters configured to despread the received signal to produce a plurality of components of the spread spectrum signal using the associated code, each of the plurality of components having a different code phase than all others of the plurality of components; a weighting bank configured to weigh each of the plurality of components with a weight value based on a phase difference between that component and a center code phase of the plurality of components; and an adder configured to add the weighted components to determine a tracking error. - View Dependent Claims (10, 11, 12)
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Specification