Abstract: To optimize ICI ( Inter-Carrier Interference) of spectrum pooling system based on wavelet，the ICI suppression optimization algorithm based on genetic algorithm is proposed． The genetic algorithm is used to get the optimum weight vector for suppressing ICI energy of un-LU ( un-Licensed User ) ． The algorithm can optimize un-LU interference energy without sacrificing the band-with of un-LU． Numerical and simulation results show the data transmission rate of un-LU is ensured，the ICI of LU ( Licensed User) is reduced and the BEＲ ( Bit Error Ｒate) performance of LU is improved by implementing the algorithm according to target BEＲ of un-LU．

Key words: genetic algorithm, inter-carrier interference ( ICI) suppression, spectrum pooling, wavelet packet modulation