APPARATUS AND METHODS FOR ESTIMATING AN UNKNOWN FREQUENCY ERROR OF A TONE SIGNAL
First Claim
1. A method of estimating an unknown frequency error of a tone signal, the method comprising:
- sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples;
applying a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency;
estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values;
measuring a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error;
repeating the applying, estimating, and measuring for different frequency offsets; and
determining, when a particular frequency offset has been applied which results in a particular estimated tone frequency error and a measured signal-to-noise ratio that is above a threshold, that the particular estimated tone frequency error is equal to the unknown frequency error of the tone signal.
1 Assignment
0 Petitions
Accused Products
Abstract
Estimating an unknown frequency error of a tone signal may comprise sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples, and repeatedly, for different frequency offsets: applying a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency; estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values; and measuring a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error. Other aspects, embodiments, and features are also claimed and discussed.
8 Citations
61 Claims
-
1. A method of estimating an unknown frequency error of a tone signal, the method comprising:
-
sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples; applying a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency; estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values; measuring a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error; repeating the applying, estimating, and measuring for different frequency offsets; and determining, when a particular frequency offset has been applied which results in a particular estimated tone frequency error and a measured signal-to-noise ratio that is above a threshold, that the particular estimated tone frequency error is equal to the unknown frequency error of the tone signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. An apparatus for estimating an unknown frequency error of a tone signal, the apparatus comprising:
-
a sampler for sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples; and signal processing circuitry configured to; apply a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency; estimate, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values; measure a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error; repeat the applying, estimating, and measuring for different frequency offsets; and determine, when a particular frequency offset has been applied which results in a particular estimated tone frequency error and a measured signal-to-noise ratio that is above a threshold, that the particular estimated tone frequency error is equal to the unknown frequency error of the tone signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
-
32. An apparatus for estimating an unknown frequency error of a tone signal, the apparatus comprising:
-
means for sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples; means for applying a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency; means for estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values; means for measuring a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error; means for repeating the applying, estimating, and measuring for different frequency offsets; and means for determining, when a particular frequency offset has been applied which results in a particular estimated tone frequency error and a measured signal-to-noise ratio that is above a threshold, that the particular estimated tone frequency error is equal to the unknown frequency error of the tone signal. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
-
-
47. A computer-readable medium comprising code, which, when executed by a processor, cause the processor to perform operations for estimating an unknown frequency error of a tone signal, the computer-readable medium comprising:
-
code for sampling, within an error bandwidth, wireless signals including the tone signal that occupy the error bandwidth to generate signal samples; code for applying a frequency offset to the signal samples to produce offset values that represent the signals occupying an offset bandwidth equal to the error bandwidth offset by an offset frequency; code for estimating, within a frequency estimation range less than the error bandwidth, a tone frequency error using the offset values; code for measuring a signal-to-noise ratio of the tone signal using the signal samples and the estimated tone frequency error; code for repeating the applying, estimating, and measuring for different frequency offsets; and code for determining, when a particular frequency offset has been applied which results in a particular estimated tone frequency error and a measured signal-to-noise ratio that is above a threshold, that the particular estimated tone frequency error is equal to the unknown frequency error of the tone signal. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61)
-
Specification