预失真系统的采样率和滤波器带宽的设计  

Design of Sampling Rate and Filter Bandwidth in Predistortion System

作　　者：张鹏[1] 杨刚[1] 杨霏[1] 刘昌银[1] 

机构地区：[1]中国传媒大学信息工程学院,北京100024

出　　处：《中国传媒大学学报（自然科学版）》2010年第2期31-35,共5页Journal of Communication University of China：Science and Technology

摘　　要：给出了预失真系统中信号源采样率和滤波器带宽的合理设计方法。考虑到腔体滤波器能较好地滤除射频信号的高阶互调分量,预失真信号通常只需补偿功放的3阶互调失真,因此3阶互调分量应尽可能少地有混叠、有损失送至功放。根据奈奎斯特定理,应对信号源进行3~4倍过采样,带通滤波器的带宽应取3~4倍过采样对应的带宽。仿真结果表明,设计方法合理,能以较低的计算复杂度和硬件成本获得良好的线性化性能。The design methods of the source sampling rate and bandpass filter bandwidth in a predistortion system are proposed.Because cavity filter can filter out higher-order intermodulation products（IMP）,the predistorter usually compensates only 3rd-order intermodulation distortion.So,3rd-order IMP should be feed to the power amplier losslessly.According to Nyquist＇s Theory,the oversampling rate between 3 and 4 and its corresponding bandwidth are preferable.Simulation results show that,the proposed methods of designing these parameters are reasonable,and better linearization performance can be obtained at the cost of low computational complexity and hardware cost.

关 键 词：功放线性化 数字基带预失真 过采样 带通滤波器 

分 类 号：TN929.52[电子电信—通信与信息系统]