Patent ID: 8175071

Claim:
An intercell interference mitigation apparatus for use in a terminal having a single reception antenna in a multi-cell downlink of an OFDMA (Orthogonal Frequency Division Multiple Access) system, the apparatus comprising: a plurality of parallel interference cancellers for canceling intercell interference by respreading soft decision values of cells other than a self cell; a plurality of LLR creation blocks for creating channel LLRs (Log Likelihood Ratios) required for the soft decision for each of subcarriers, and producing channel soft outputs; a plurality of soft deciders for performing a soft decision of a self user symbol of the self cell in which interferences from other users are mitigated, and producing the soft decision values; and a plurality of channel estimation blocks for performing iterative channel estimation by respreading symbols of the soft decision values produced from the soft deciders, wherein said performing iterative channel estimation includes: constructing a symbol vector as an initial one by using a pilot symbol; updating a channel frequency response estimation value of the symbol vector by using a channel impulse response; and reconstructing the symbol vector by soft decision iterated for a predetermined number of sequences.