并发双波段射频功放数字预失真同步性研究  

Synchronization Study of Digital Predistortion for Concurrent Dual-Band RF Power Amplifiers

作　　者：惠明[1] 刘太君[1] 叶焱[1] 徐铁峰[1] 申东娅[2] 

机构地区：[1]宁波大学信息科学与工程学院,宁波315211 [2]云南大学信息学院,昆明650091

出　　处：《微波学报》2012年第5期69-72,92,共5页Journal of Microwaves

基　　金：国家科技重大专项(2010ZX03007-003-04);国家自然科学基金(61171040);浙江省科技重大专项重点国际合作项目(2010C14007);浙江省自然科学基金(Y1101270);宁波市自然科学基金(2011A610188);云南省科技重大专项重点国际合作项目(2009AC010);宁波大学优秀论文培育基金(PY20100004)

摘　　要：在并发双波段调制信号驱动下,射频功放的非线性更显著和复杂,对其进行线性化将面临新的问题。文中研究了低频波段和高频波段的同步性对线性化的影响,提出同步并发双波段射频信号生成方法,用于解决两频段信号加载时的不同步问题。文中使用1001型(中间两个载波空缺)CDMA2000信号和单载波WCDMA信号分别作为低频段和高频段的测试信号,施加到一个峰值功率为51dBm的Doherty功放上进行实验验证。实验结果表明:两频段不同步将造成无法使用数字预失真方法对功放进行线性化;在同步情况下,采用记忆多项式(MP)可显著提高并发双波段射频功放的线性度。The nonlinearity of RF Power Amplifiers （RFPAs） driven by the concurrent dual band modulation signal is more complex and significant, so there are new problems for linearizing a concurrent dual band RFPA. In this paper, the in- fluences of the synchronicity between the low frequency band and the high frequency band to the linearization are studied. The generation method of synchronous concurrent double band RF signals is proposed for solving the problems concerned with out-of-synchronization while two frequency signals are loaded. The 1001 （two carriers in the middle is empty） CDMA2000 signal and a single-carrier WCDMA signal are used as low frequency and high frequency band test signal respectively, which are used to stimulate the Doherty power amplifier with the peak power of 5 ! dBm in the experiment. The experimental results demonstrated that digital predistortion method is unefficient for linearization if the modulated signals in the two bands are not synchronized. When the signals in the two bands are synchronized, the linearity of the concurrent dual band RF power ampli- fier could be improved significantly by utilizing the memory polynomial （MP） predistortion.

关 键 词：双波段 DOHERTY功放 记忆多项式 非线性 数字预失真器 

分 类 号：TN722.75[电子电信—电路与系统]