摘要
现代通信系统的通信频带越来越拥挤,容易导致传输信号产生失真。功率放大器是通信系统的主要器件,也是产生非线性失真的关键部件。为了降低传输信号的失真程度,减小对相邻频段的用户的干扰,功率放大器的线性化技术显得尤其重要。预失真技术由于应用范围广,自适应性强,效率高等特点成为消除非线性失真的首选。考虑到功率放大器的非线性特性和记忆效应,本文提出一种基于预失真原理,利用Wiener模型来建模的线性化技术,并提出一种有效提取Wiener模型参数的方法。仿真结果表明该技术能有效补偿功率放大器的非线性失真和记忆效应,改进系统性能。
The bandwidth of modern communication system became more and more crowded,which easily lead to the distortion of transmission signal.The power amplifier is an important component of the communication system,also is the key component which generates the nonlinear distortion.Power amplifier linearization techniques are very important to reduce the distortion of the transmitted signal and the adjacent band interference of users.As its facility of implementation,adaptive ability,and high efficiency,the pre-distortion technology becomes the first choice to eliminate nonlinear distortion.In this paper,taken into account the nonlinearities and memory effects of the power amplifier,a new technique,based on the pre-distortion principle for linearizing a power amplifier,which is modeled by a Wiener model is proposed.An efficient and original method for extracting the parameters of the power amplifier＇s Wiener Model also been proposed.Then the simulation results verify that this method can compensate effectively to nonlinear distortion and memory effect of power amplifier,improve system performance.
出处
《微计算机信息》
2010年第32期176-178,共3页
Control & Automation
