Carrier frequency offset estimation for wireless communication
AssigneeNXP USA, Inc.
InventorsMihai-Ionut Stanciu, Raja V. Tamma, Khurram Waheed
Life of this patent
Estimating the term…
Abstract
Methods and system for carrier frequency offset (CFO) estimation are described. The method includes determining correlation values between a plurality of samples from a received signal and a plurality of reference signals corresponding to a plurality of CFO candidates. A set of correlation values which exceeds a threshold is determined and a corresponding CFO candidate for each correlation value in the set is selected. A CFO estimate based on an interpolation of selected CFO candidates is then calculated.
Claims17
A method of carrier frequency offset (CFO) estimation, comprising:
- determining correlation values between a plurality of samples from a received signal and a plurality of reference signals, the plurality of reference signals corresponding to a plurality of CFO candidates;
- determining a set of correlation values which exceed a threshold;
- for each correlation value in the set, selecting a CFO candidate from the plurality of CFO candidates;
- and
- calculating a CFO estimate based on an interpolation of selected CFO candidates;
- and
- further comprising discarding an outlier selected CFO candidate before the step of calculating a CFO estimate, the discarding based on a difference between the outlier selected CFO candidate and a mean of at least two selected CFO candidates.
A method of carrier frequency offset (CFO) estimation, comprising:
- receiving a plurality of samples of a signal;
- generating a plurality of reference signals;
- determining correlation values between the plurality of samples and the plurality of reference signals;
- determining a set of correlation values which exceed a predetermined threshold;
- using the set of correlation values, selecting a CFO candidate for each of three correlation values in the set;
- and
- calculating a CFO estimate based on a mean of at least two selected CFO candidates;
- calculating a mean of the two latest selected CFO candidates;
- determining a difference between the mean and the earliest selected CFO candidate;
- and
- discarding a correlation value based on the difference.
A system for estimating carrier frequency offset (CFO) comprising:
- a signal receiver for providing samples of a received signal;
- a reference signal generator for generating a plurality of reference signals;
- a correlator unit coupled to the signal receiver and to the reference signal generator, the correlator unit for determining correlation values between a plurality of samples from the received signal and the plurality of reference signals;
- and
- a logic unit coupled to receive an output of the correlator unit, the logic unit for selecting CFO candidates using correlation values which exceed a threshold and for interpolating between selected CFO candidates to generate a CFO estimate;
- and
- wherein interpolating between selected CFO candidates to generate a CFO estimate includes discarding an outlier selected CFO candidate based on a difference between a mean of at least two selected CFO candidates and the outlier selected CFO candidate.
Dependencies are inferred from the claim text.