摘要
跳频DPD的目的是提高末级功放效率,减少功放的无效热耗,从而减小跳频设备的功耗、体积和重量。DPD对功放的算法优化需要一定计算时间,跳频DPD的实现难点为需要实时跟踪工作频点的快速变化。本文通过将无线超宽带系统的工作频段划分为许多小频段,各个频段相对带宽大致为工作频点的1%左右。经仿真和实验验证了将某个频点训练得到的DPD系数应用到相邻频段,射频相关指标恶化不明显,从而解决了在跳频DPD中需要实时跟踪频点变化的难点。
The purpose of frequency hopping(FH)DPD is to improve the efficiency of final power amplifier and reduce the invalid heat consumption of power amplifier,thereby reducing the power consumption,volume and weight of frequency hopping equipment.Since DPD needs a certain amount of computing time to optimize the algorithm of power amplifier,the difficulty of implementing FH DPD is to track the rapid change of working frequency in real time.In this paper,the working band of wireless UWB system is divided into many small bands,and the relative bandwidth of each band is about 1%of the working frequency.The simulation and experiment results show that the DPD coefficients obtained by training a certain frequency point can be applied to adjacent bands and the degradations of radio frequency performance metrics are not obvious.This solves the difficulty of real-time tracking frequency changes in FH DPD.
作者
张欣
ZHANG Xin(The 7th Research Institute of China Electronics Technology Group Corporation,Guangzhou 510310,China)
出处
《移动通信》
2021年第3期77-81,共5页
Mobile Communications
关键词
跳频
超宽带
数字预失真
非线性系统
功放
frequency hopping
ultra wide band
digital predistortion
nonlinear system
amplifier
