一种基于分段线性化的低邻道泄漏预失真方法  

A New Predistortion Method with Low Adjacent Channel Leakage Based on Piecewise Linear

作　　者：胡明[1] 潘文生[1] 朱晓东[1] 

机构地区：[1]电子科技大学通信与信息工程学院,四川成都611731

出　　处：《电子学报》2013年第11期2297-2301,共5页Acta Electronica Sinica

基　　金：国家重大专项(No.2010ZX03007-003;No.2011ZX03001-006-01;No.2012ZX03003010-003;No.2014ZX03003001-002);国家自然科学基金(No.61101034;No.61271164;No.61001087;No.u1035002/L05)

摘　　要：本文基于预失真技术提出一种记忆非线性系统的线性化处理方法.与传统预失真模型(直接学习型、间接学习型)获取系统逆传递函数的方式不同,这里采用直接获取记忆非线性系统传递函数的方式,将传递函数表示为分段线性化形式后,应用于所提出的预失真方法中.验证结果显示,该方法与无预失真情况相比,记忆非线性系统输出的归一化均方误差改善约80dB,且邻道泄漏比的改善值超过70dB,克服系统的记忆性、非线性,让记忆非线性系统的输出和输入呈现线性关系.A new method of linearity based on predistortion for memory nonlinear system is introduced in this paper .Differ-ent from the traditional predistortion models （direct study model and indirect study model ） ,the transfer function instead of the in-verse transfer function is obtained for memory nonlinear system .The transfer function is presented as piecewise linear function first , and then be used in predistortion process .The results show that the NMSE （Normalized Mean Square Error ） of the memory nonlin-ear system output is reduced about 80dB ,and the ACLR （Adjacent Channel Leakage Ratio ） is reduced over 70dB ,comparing with no predistortion system .The memory and nonlinear characteristics are eliminated ,and the relationship of input and output becomes linear and memoryless .

关 键 词：预失真 分段线性化 邻道泄漏比 记忆非线性系统 

分 类 号：TN830.6[电子电信—信息与通信工程]