Patent ID: 7502311
Filing Date: 2009-03-10
Classification: H04B,H04L

Abstract:
1. A method for detecting by a mobile station a cell in which the mobile station is located in an Orthogonal Frequency Division Multiple Access (OFDMA) system, the method comprising the steps of: receiving a signal including a base station's PN code from the base station and performing fast Fourier transform (FFT) on the received signal thereby generating an FFT-processed signal; generating a test PN code for comparison with the base station's PN code; and detecting a cell where the mobile station is located by searching for a PN code synchronized in the FFT-processed signal using the test PN code using one of a first cell detecting step, a second cell detecting step, and a third cell detecting step; wherein the first cell detecting step comprises the steps of: dividing the FFT-processed signal by a signal corresponding to the test PN code thereby generating a divided signal; performing inverse fast Fourier transform (IFFT) on the divided signal thereby generating an IFFT-processed signal; and determining whether the test PN code is synchronized with a PN code for the IFFT-processed signal, the test PN code being synchronized with the PN code for the IFFT-processed signal when a channel region's dispersion for the IFFT-processed signal is a maximum value;