Patent ID: 7773705

Claim:
A mobile station for receiving a target signal and a neighbor signal through at least two receiving antennas from a serving base station and neighbor base stations, and canceling the neighbor signal from among the received signals so as to cancel a neighbor cell interference in a wireless communication system, the mobile station comprising: an operator for performing a Fourier transform operation with respect to the target signal and neighbor signal received through each of the receiving antennas; a channel estimator for receiving the Fourier-transformed signals from the operator, and estimating a frequency response of each channel received from the serving base station and neighbor base station; and a detector for detecting a target signal defined by a following Equation from the received signals by using the estimated channel frequency response, x ~ S ⁡ ( k ) = ⁢ CSI · 1 r NN 2 · z N H · Y _ = ⁢ ( r NN 2 · ∏ i = 1 N - 1 ⁢  h _ i  2 ) · 1 r NN 2 · z N H · Y _ = ⁢ u N H · Y _ , wherein CSI refers to channel state information defined by a following Equation, r NN represents a QR decomposition component of a channel frequency response matrix H , ∥h i ∥ represents the norm of a frequency response, Y represents a reception signal matrix of N antennas, and u N represents a linear minimum mean square error (MMSE) detection nulling vector, CSI = r NN 2 · ∏ i = 1 N - 1 ⁢  h _ i  2 .