Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system
AssigneeInterDigital Technology Corporation
InventorsGary Lomp, Fatih Ozluturk
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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.
Claims12
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.
A circuit for tracking a spread spectrum signal having an associated code, the circuit comprising:
- 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.
A circuit for tracking a spread spectrum signal having an associated code, the circuit comprising:
- 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.
Dependencies are inferred from the claim text.