Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system
First Claim
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1. A method for tracking a spread spectrum signal having an associated code at a receiver, the method comprising:
- despreading 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 based on a phase difference between that component and a center code phase associated with 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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12 Claims
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1. A method for tracking a spread spectrum signal having an associated code at a receiver, the method comprising:
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despreading 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 based on a phase difference between that component and a center code phase associated with 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;
means for despreading 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;
means for weighting each of the plurality of components based on a phase difference between that component and a center code phase associated with the plurality of components; and
determining 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 despreading 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 weighting each of the plurality of components based on a phase difference between that component and a center code phase associated with the plurality of components; and
an adder for adding the weighted components to determine a tracking error. - View Dependent Claims (10, 11, 12)
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Specification