Patent ID: 7881410
Filing Date: 2011-02-01
Classification: H04L

Abstract:
1. A method for detecting a user in a communication system, the method comprising: selecting i ranging sub-carrier signals among k sub-carrier signals upon which a k-point fast Fourier transform (FFT) has been performed, wherein each of i and k is a natural number; multiplying the i ranging sub-carrier signals by a ranging code; performing a k-point inverse fast Fourier transform (IFFT) on the i ranging sub-carrier signals multiplied by the ranging code, and (k-i) 0s; detecting a power of each of the IFFT-performed k point signals; estimating a power of a desired received signal and a power of an interference signal by using powers of the k point signals according to a predetermined scheme; and detecting a user depending on the power of the desired received signal and the power of the interference signal, wherein the step of estimating a power of a desired received signal and a power of an interference signal comprises: wherein N wherein if N