An Effective PMEC Predistortion Method Based on the Strong Memory Effect Characteristics of Broadband Power Amplifier

According to the strong memory effect characteristics of the broadband RF power amplifier, this paper presents a new predistortion method, and it is termed as Parallel MP-EMP-CIMT (PMEC). The new predistorter is constructed of three parts, Memory Polynomial (MP), Envelope Memory Polynomial (EMP) and Cross Items between Memory Times (CIMT). Compared with the traditional Hybrid MP-EMP (HME) method, PMEC method increases the cross items between different memory times, in order to solve the problem of high system complexity, the EMP predistorter is simplified and the high order nonlinear terms of CIMT predistorter are cut off. The measure results show that PMEC method can acquire better linear effect than the MP method and the HME method. Compared with the MP method, PMEC method reduces the third-order ACPR of output signal by 1.07 dB/1.32 dB, and cut down 18.75% of the predistortion coefficient; Compared with the HME method, PMEC method reduces the third-order ACPR of output signal by 0.2 dB/0.99 dB, using 79.59% of the predistortion coefficients.