基于DTMB的半自动预失真器的设计与实现  

Design and implementation of semiautomatic predistorter based on DTMB

作　　者：叶宇煌[1] 庄敏敏[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2012年第6期764-768,共5页Journal of Fuzhou University(Natural Science Edition)

基　　金：福建省科技厅重大专项基金资助项目(2009HZ0003-1)

摘　　要：针对DTMB标准中OFDM信号高PAPR的问题,为了降低射频功率放大器的非线性特性对OFDM信号产生的不良影响,并提高射频功率放大器的工作效率,通过在DTMB信道处理系统中引入预失真技术,实际采集射频功率放大器的非线性特性曲线,结合查询表技术的预失真器补偿方式,实现对射频功放非线性失真的有效抵消.最终测试表明,该半自动预失真器能够实现较好的预失真补偿功能.For the problems of high PAPR of OFDM signal in DTMB,and in order to reduce the bad effects produced by RF power amplifier and improve its efficiency,predistortion technology is introduced in DTTB channel processing system in the paper.Measuring characteristic curve of amplifier combined with predistorter based on LUT technology is adopted,thus the non-linearity distortion of amplifier is cancelled effectively.The final test show that the semiautomatic predistorter can achieve a good predistortion compensation function.

关 键 词：DTMB 预失真 查询表 功率放大器 

分 类 号：TN761[电子电信—电路与系统]