关键词: Doherty功放, 数字预失真（DPD）, 记忆多项式, 递归最小二乘法（RLS）, 最小均方误差（LMS）

Abstract: The power amplifier’s efficiency and linearity of communication system affect the performance of the whole system and Doherty technology is an effective way to improve efficiency，but its linearity deteriorates while its increasing the efficiency.Digital predistortion is the most promising linearization technology and all sorts of models are put forward in the past few years.Combined the proper order and memory depth of memory polynomial DPD，a hybrid algorithm of LMS and RLS can realize rapid and efficient linearization of Doherty power amplifier.Simulation result demonstrates that the algorithm mentioned has fast convergence and significantly improves the nonlinearity and memory effect of the system.

Key words: Doherty power amplifiers, Digital Predistortion（DPD）, memory polynomials, Recursive Least Squares（RLS）, Least Mean Square（LMS）