Patent ID: 8396175
Filing Date: 2013-03-12
Classification: H04L

Abstract:
1. A method for estimating and correcting a frequency offset between a local clock of a receiving transceiver and a remote clock of a corresponding emitting transceiver, said receiving transceiver receiving from the emitting transceiver electromagnetic signals that lack a continuous sinusoidal carrier, said method comprising the steps of: receiving by said receiving transceiver, a signal emitted by the emitting transceiver, said signal lacking the continuous sinusoidal carrier and being formed of at least one symbol, each symbol being emitted within a time frame having a first duration T sampling the said received signal by taking for each frame a set of energy measurements of said received signal; forming a matrix representative of said energy measurements; determining from said energy matrix, points of maximum energy within each of said time frames: determining a straight line connecting a plurality of said points of maximum energy; determining a slope of said straight line; calculating a frequency offset between the clock of the emitting transceiver and the clock of the receiving transceiver by using the slope of said straight line; adjusting the frequency of the receiving transceiver's clock according to the calculated frequency offset.