【摘要】 对于在复杂的移动传输环境中传送高速的数据流,小波包多载波调制通信系统在数据传输过程中仍然不可避免地存在着由于多径效应引起的符号间干扰。在对多径瑞利信道的建模基础上分析了小波包多载波调制系统在瑞利信道下的系统性能。同时,通过引入强迫归零方法,提出一种对时域信道冲激响应估计下的强迫归零均衡算法。该算法简单且易于实现,不增加任何系统复杂度。仿真结果表明系统在多径瑞利信道下的性能得到了有效提高,证明了该方案的可行性和在高速数据传输领域及未来移动通信中具有良好的应用前景。更多还原

【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.更多还原