摘要
针对有记忆非线性功放提出了一种新的基于查找表的记忆型预失真器.该记忆型预失真器采用无记忆预失真器的级联扩展,其横向滤波器结构相比记忆多项式方法降低了复杂度,却能够得到与其相近的线性化效果.并且针对查找表固有的量化误差大和自适应收敛速度慢的缺点,分别采用线性内插和加权窗迭代更新的方法加以改进.在非线性功放的记忆多项式模型下,通过多载波WCDMA宽带信号和OFDM宽带信号验证了基于查找表的记忆型预失真器的良好线性化效果和改进方法的有效性.
A new look-up-table memory predistorter for power amplifier with memory effects is proposed. The cascade extension of the memoryless predistorter and the structure of finite-impulse-response fdter significantly reduce the complexity compared to memory polynomial methods, whereas they can get the close performance. Two improved methods, linear insertion and iteration with weights＇ windows, are also discussed to solve quantizafion distortions and convergence speed problems respectively, which are introduced intrinsically by look-up-table method. Under power amplifier＇s memory polynomial model, simulation results of multi- carriers WCDMA wideband signal and OFDM wideband signal show excellent performance of the look-up-table memory predistorter and the efficiency of the two improved methods.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2008年第9期1728-1732,共5页
Acta Electronica Sinica
关键词
功放线性化
预失真器
查找表
有记忆功放
amplifier linearization
predistorter
look-up-table
power amplifier with memory effects
