US 8,897,701 B2 · Efficient method to overcome frequency errors within four time slots

Abstract

A system and a method in which a first frequency correction is determined for a frequency of a local oscillator with respect to a frequency of a first time slot of a received signal. The first frequency correction is applied to adjust the frequency of the local oscillator. A second frequency correction is determined for the frequency of the local oscillator with respect to a frequency of a second time slot of the received signal. The second frequency correction is applied to adjust the frequency of the local oscillator. A third frequency correction is determined for the frequency of the local oscillator with respect to a frequency of a third time slot and a fourth time slot of the received signal, and the third frequency correction is applied to adjust the frequency of the local oscillator.

Claims28

Dependent claims

A wireless device, comprising:

a frequency offset estimator capable of determining a frequency offset of a frequency of a local oscillator with respect to a carrier frequency of a received signal;
a processing device coupled to the frequency offset estimator capable of determining a frequency correction for the local oscillator for each of first and second time slots of the received signal, and capable of determining a combined frequency correction for the local oscillator for third and fourth time slots of the received signal, the first, second, third and fourth time slots of the received signal being consecutive time slots of the received signal;
and a frequency corrector capable of adjusting the frequency of the local oscillator based on the frequency correction determined by the processing device.

A method, comprising:

determining a first frequency correction for a frequency of a local oscillator with respect to a frequency of a first time slot of a received signal;
applying the first frequency correction to adjust the frequency of the local oscillator;
determining a second frequency correction for the frequency of the local oscillator with respect to a frequency of a second time slot of the received signal, the second time slot being consecutively subsequent to the first time slot;
applying the second frequency correction to adjust the frequency of the local oscillator;
determining a third frequency correction for the frequency of the local oscillator with respect to a frequency of a third time slot and a frequency of a fourth time slot of the received signal, the third frequency correction being a combined frequency correction that is based on the frequency of the third time slot and the frequency of the fourth time slot, and the third time slot being consecutively subsequent to the second time slot and the fourth time slot being consecutively subsequent to the third time slot;
and applying the third frequency correction to adjust the frequency of the local oscillator.

3 more elements

A wireless device, comprising:

a frequency offset estimator capable of estimating a frequency offset of a frequency of a local oscillator of the wireless device with respect to a carrier frequency of a received signal as part of a handover of the wireless device from a first base station to a second base station of a wireless network;
a frequency correction generator coupled to the frequency offset estimator capable of generating a frequency correction for the local oscillator for each of first and second time slots of the received signal, and capable of determining a combined frequency correction for the local oscillator for third and fourth time slots of the received signal, the first, second, third and fourth time slots of the received signal being consecutive time slots of the received signal, and the combined frequency correction for the local oscillator for the third and fourth time slots of the received signal comprising an average of a frequency correction for the third time slot and a frequency correction for the fourth time slot;
and a frequency adjustor coupled to the frequency correction generator capable of adjusting the frequency of the local oscillator based on the frequency correction generated by the frequency correction generator.

Dependencies are inferred from the claim text.

Efficient method to overcome frequency errors within four time slots

Life of this patent

Efficient method to overcome frequency errors within four time slots

Life of this patent

Abstract

Claims28