关键词: 小波包变换, 多载波调制, 均衡, 信道估计, 衰落信道

Abstract: For transmitting high-speed data stream in complicated mobile transmission environment, intersymbol interference inevitably exists as a result of multipath effect in the course of the data transmission in wavelet packet transform-based multicarrier modulation communication system. On the basis of the establishment of multipath Rayleigh fading channel model, the authors analyzed the system performance in Rayleigh fading channels. At the same time, by introducing the zero-forcing method, an equalization algorithm of zero-forcing was proposed, which was based on time-domain channel estimation of wavelet packet transform-based multicarrier modulation. The proposed algorithm is simple and easy; moreover, the system complexity does not increase. The simulation result indicates that the performance of communication system is enhanced effectively in the multipath Rayleigh fading channel. The research validates the feasibility of the proposed scheme, which has a bright application prospect in the fields of high-speed data transmission and future mobile communication.

Key words: wavelet packet transform, multicarrier modulation, equalization, channel estimation, fading channel