Patent ID: 7936832

Claim:
A method for canceling inter-carrier interference (ICI) from an Orthogonal Frequency Division Multiplexing (OFDM) signal received from a receiver in a wireless communication system, the method comprising: canceling ICI included in a preamble symbol of the received signal; channel equalizing a data symbol of the received signal by using an initial channel parameter estimated by using the ICI-canceled preamble symbol, and channel equalizing the data symbol of the received signal by using the initial channel parameter; finding a soft decision value of a turbo code for the channel-equalized data symbol; and canceling the ICI from the data symbol by using the soft decision value, wherein in canceling the ICI included in the preamble symbol, the ICI canceled preamble symbol satisfies the equation: y ( k )= Ŵ H ( k ) û ( k ), where k=1, . . . , N, the N is the total number of subcarriers, a tap-weight is Ŵ(k)=[ω 0 (k), ω 1 (k), . . . , ω K−1 (k), ] T , and û(k) =[û(k), û(k−1), . . . , u(k−K+1)] T , wherein channel equalizing the data symbol of the received signal comprises: multiplexing the received data estimated by the initial channel parameter by using a weight, by delaying the received data for a predetermined time frame and applying a weight to the received data and the delayed data; and adding the multiplexed received data to output equalized data.