FREQUENCY OFFSET CORRECTION
First Claim
1. A method, comprising:
- receiving a plurality of fingers of a radio frequency (RF) signal;
determining a phase estimation based upon samples corresponding to each of the plurality of fingers, the phase estimation corresponding to a carrier frequency offset associated with the received RF signal;
rotating a sample corresponding to at least one finger of the RF signal based at least in part upon the determined phase estimation; and
determining a channel estimation corresponding to the at least one finger based upon the rotated sample.
4 Assignments
0 Petitions
Accused Products
Abstract
Various methods and systems are provided for frequency offset correction. In one example, among others, a method includes determining a phase estimation of a RF signal, rotating a sample of the RF signal based at least in part upon the phase estimation, and determining a channel estimation based upon the rotated sample. The channel estimation may be derotated based at least in part upon the phase estimation. In another example, a communication device includes a phase rotator configured to rotate RF signal samples based upon a rotation offset, a channel estimation filter configured to determine channel estimates, and a phase derotator configured to rotate the channel estimates based upon another rotation offset. Another example of a communication device includes a differential detector configured to determine conjugate multiply results, an averaging filter configured to sum the results, and a phase estimator configured to determine a phase estimation based upon the sum.
10 Citations
20 Claims
-
1. A method, comprising:
-
receiving a plurality of fingers of a radio frequency (RF) signal; determining a phase estimation based upon samples corresponding to each of the plurality of fingers, the phase estimation corresponding to a carrier frequency offset associated with the received RF signal; rotating a sample corresponding to at least one finger of the RF signal based at least in part upon the determined phase estimation; and determining a channel estimation corresponding to the at least one finger based upon the rotated sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A communication device, comprising:
a circuit that determines a channel estimation for a finger of a received radio frequency (RF) signal, the circuit comprising; a phase rotator configured to rotate samples of the finger of the RF signal based upon a first rotation offset corresponding to a carrier frequency offset associated with the received RF signal; a channel estimation filter configured to determine channel estimates based upon the rotated samples; and a phase derotator configured to rotate the channel estimates based upon a second rotation offset corresponding to the carrier frequency offset. - View Dependent Claims (12, 13, 14, 15)
-
16. A communication device, comprising:
a circuit that provides a phase estimation based upon a carrier frequency offset associated with a received radio frequency (RF) signal, the circuit comprising; a differential detector configured to determine a series conjugate multiply results for a series of samples associated with the received RF signal; an averaging filter configured to sum the series of conjugate multiply results; and a phase estimator configured to determine the phase estimation based upon the sum of the conjugate multiply results. - View Dependent Claims (17, 18, 19, 20)
Specification