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 .
出处
《电子学报》
EI
CAS
CSCD
北大核心
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)
关键词
预失真
分段线性化
邻道泄漏比
记忆非线性系统
predistortion
piecewise linear
adjacent channel leakage ratio
memory nonlinear system
