延时估计偏差对多项式预失真的影响

Influence of Time Delay Estimation Error on Polynomial Predistortion

摘要:

延时估计偏差通常会严重影响射频（RF）功率放大器预失真技术的性能.通过对预失真技术中延时估计偏差的理论分析，发现若要保证存在延时估计偏差时预失真器仍能实现放大器的线性化，则设计的预失真器应是理论上理想预失真器的一个延时版本；并提出一种记忆多项式模型用于放大器的预失真.仿真结果表明，采用记忆多项式模型比一般多项式模型对延时估计偏差有更强的鲁棒性.

Abstract:

Time delay estimation error may decrease the linearization performance of adaptive predistortion for radio frequency(RF) power amplifier. Theory analysis of delay error estimation is made and results show that the predistoter converges at a delay version of the theory value considering the existence of the delay estimation error. And a memory polynomial model is proposed for the predistorter. Simulation results demonstrate that memory polynomial model is more robust to delay estimation error than the general nonlinear polynomial model.