Abstract : in this paper , an orthogonal multicode wideband cdma system modelincluding pilot channel based on chaos spreading sequences is given . based on chaos sequences , with pilot channel inserted orthogonally , it is shown that the performance of the system is improved . the performance of the system in fading channel is analyzed 文摘:提出一种基于混沌序列含导频信号的宽带正交多码cdma系统模型，利用混沌序列以及采用正交插入导频信号提高系统性能，并对此模型在衰落信道中的性能进行分析。
The principle and characteristics of ofdm system are introduced first . then several key technologies of channel estimation and equalization for ofdm are discussed in detail , including pilot signal based channel estimation methods , cyclic prefix based channel estimation method , frequency domain adaptive filtering method and time domain equalization method for long channel impulse . the corresponding comparison and simulations are also provided 文中讨论了利用导频信号的信道估计方法，利用循环前缀进行信道估计的方法， ofdm信号均衡中自适应滤波技术，及信道冲击响应长于循环前缀时利用时域均衡减少解调器输入信号拖尾长度的方法，分析了这些方法的原理，并通过计算机仿真验证了这些方法的性能。
