Patent ID: 7742391
Filing Date: 2010-06-22
Classification: H04L

Abstract:
1. A method of estimating a frequency offset by a subscriber station of a communication system in which a plurality of sectors are allocated to a cell, the method comprising: extracting a preamble sequence from a downlink frame signal; estimating a phase offset of a sector to which the subscriber station belongs from among the sectors by using the preamble sequence; calculating autocorrelation values for respective signals of the preamble sequence; compensating the autocorrelation values with the phase offset; and estimating a frequency offset from the sum of phase offset compensated autocorrelation values, wherein estimating of the phase offset comprises: wherein the phase offset is determined by: where N indicates a number of preamble sequences, n indicates an index of the preamble sequence in a time domain, and s indicates a number for shifting of the detected sector with respect to the reference sector from among the sectors.