Patent ID: 8995585
Filing Date: 2015-03-31
Classification: H04L,H04W

Abstract:
1. A carrier recovery device comprising: a coarse estimator, a fine estimator, a switch to select an estimator output, and a sweeper configured to sweep an input data carrier frequency offset within a certain range, the sweeper comprising a plurality of parallel scanners, each scanner including a pre-rotator and a detector, each pre-rotator configured to use a respective pre-defined frequency value to rotate data inputted into said pre-rotator, each detector configured to calculate a detected value based on an output of a corresponding pre-rotator; wherein the coarse estimator receives, as input, a pseudo random noise signal and is arranged to estimate a residual frequency offset by using a correlation of the pseudo random noise; wherein the fine estimator receives, as input, estimated channel information distinct from the pseudo random noise signal, and is arranged to estimate the residual frequency offset by using the estimated channel information; wherein the switch is controlled to select data outputted out of the coarse estimator, the fine estimator or the sweeper as the estimator output.