Patent ID: 7933239
Filing Date: 2011-04-26
Classification: H04J,H04L

Abstract:
1. An FFT detector of a cell ID search apparatus, wherein a FFT size of a received signal is a first FFT size or a second FFT size, wherein when a first guard band is employed to the received signal, the FFT size of the received signal is the first FFT size, and wherein when a second guard band is employed to the received signal, the FFT size of the received signal is the second FFT size, the FFT detector comprising: a guard band energy calculator to calculate a first energy at a position of the first guard band of the received signal, and a second energy at a position of the second guard band of the received signal; an energy comparator receiving the first energy and the second energy to output a first difference between the first energy and the second energy; and a processing unit to determine the FFT size of the received signal is the first FFT size or the second FFT size based on the first difference.