Abstract: For solving ICI ( Inter-Carrier Interference) suppression problem of CＲ ( Cognitive Ｒadio) system，the intelligent algorithm is designed to obtain the optimal interference subcarriers of un-LU ( un-Licensed User) ．Masking the optimal interference subcarriers can suppress ICI of CＲ． But the computation complexity of intelligent algorithm is high and computing speed is slow． So，the ICI suppression parallel algorithm is proposed．The new parallel algorithm can realize parallel computing on the multi-core processor to improve the computing speed of the intelligent algorithm and meet the practical application requirements of the CＲ system． The simulation results show that under the condition of satisfying the BEＲ ( Bit Error Ｒate) of the un-LU，the ICI of LU ( Licensed User) is reduced obviously and the better BEＲ performance of LU is obtained by the new ICI suppression parallel algorithm．

Key words: intelligent algorithm, performance optimization, spectrum pooling, parallelization