Frequency offset compensation in radio receiver
AssigneeNokia Corporation
InventorKyeong Jin Kim
Life of this patent
Estimating the term…
Abstract
A solution for estimating frequency offset in a radio telecommunication system is provided. According to the solution, an estimate for frequency offset between a radio frequency carrier wave of a received signal and frequency of a local oscillator used for downconverting the received signal in a receiver is calculated by utilizing an approximation of Gauss-Hermite integration. Parameters of the receiver are adjusted according to the frequency offset estimate in order to retrieve information from the received signal.
Claims17
A method, comprising performing, in a radio receiver, the following:
- receiving a signal transmitted over an air interface, wherein the signal comprises a set of received signal samples;
- initializing a frequency offset estimate with a predetermined value;
- calculating, for each of the set of received signal samples, a frequency offset estimate by utilizing an approximation of Gauss-Hermite integration, and by taking into account previous values for the frequency offset estimate calculated for a preceding received signal sample;
- and
- adjusting parameters of a radio receiver according to the frequency offset estimate calculated for a last received signal sample of the set of received signal samples to retrieve information from the received signal.
An apparatus, comprising:
- a controller configured to
- receive, from a communication interface, an information signal transmitted over an air interface, wherein the signal comprises a set of received signal samples;
- and
- initialize the frequency offset estimate with a predetermined value;
- calculate, for each of the set of received signal samples, a frequency offset estimate by utilizing an approximation of Gauss-Hermite integration, and by taking into account previous values for the frequency offset estimate calculated for a preceding received signal sample;
- and
- adjust parameters of a radio receiver according to the frequency offset estimate calculated for a last received signal sample of the set of received signal samples to retrieve information from the received signal.
An apparatus, comprising:
- receiving means for receiving an information signal transmitted over an air interface, wherein the signal comprises a set of received signal samples;
- initializing means for initializing a frequency offset estimate with a predetermined value;
- calculating means for calculating, for each of the set of received signal samples, a frequency offset estimate by utilizing an approximation of Gauss-Hermite integration, and by taking into account previous values for the frequency offset estimate calculated for a preceding received signal sample;
- and
- adjusting means for adjusting parameters of a radio receiver according to the frequency offset estimate calculated for a last received signal sample of the set of received signal samples to retrieve information from the received signal.
A computer program embodied on a computer-readable storage medium, the program configured to control a processor to perform a process, the process comprising:
- receiving a signal transmitted over an air interface, wherein the signal comprises a set of received signal samples;
- initializing a frequency offset estimate with a predetermined value;
- calculating, for each of the set of received signal samples, a frequency offset estimate by utilizing an approximation of Gauss-Hermite integration, and by taking into account previous values for the frequency offset estimate calculated for a preceding received signal sample;
- and
- adjusting parameters of a radio receiver according to the frequency offset estimate calculated for a last received signal sample of the set of received signal samples to retrieve information from the received signal.
Dependencies are inferred from the claim text.