Back to results
US 2009/0154619 A1Published application
Frequency error estimator using second-order loop filter and operating method of the frequency error estimator
AssigneeElectronics and Telecommunications Research Institute
InventorsSeok SEO, Hyung Jung KIM, Deock Gu JEE, Gweon Do JO, Jin Up KIM
Life of this patent
Estimating the term…
Abstract
A frequency error estimator and an operating method of the frequency error estimator are provided. In the frequency error estimator and the operating method of the frequency error estimator, a frequency error between a transmitter and a receiver of a mobile communication system using a reference code is calculated, thereby improving the precision of estimation while reflecting variations in frequency over time.
Claims12
A frequency error estimator comprising:
- a correlator which calculates a current correlation value based on an input signal and a reference code;
- a frequency error detector which calculates a cross-product error based on the current correlation value and a previous correlation value and calculating a frequency error based on the cross-product error and the previous correlation value;
- and
- a loop filter which performs filtering and thus gives SNR improvement.
1 more element
An operating method of a frequency error estimator, the operating method comprising:
- calculating a current correlation value based on an input signal and a reference code;
- calculating a cross-product error based on the current correlation value and a previous correlation value and calculating a frequency error based on the cross-product error;
- and
- calculating a filter coefficients using the slope of an S curve.
1 more element
Dependencies are inferred from the claim text.