This paper proves that the sequence of two memoryless nonlinear systems, predistorter and RF power amplifier, is commutative through theoretical derivation. For the disadvantages of frequently used predistortion structures, this paper proposes a new predistortion structure combining direct learning structure with indirect learning structure, which is simple and easy to implement The RF power amplifier predistortion linearization method is extended to the situation with memory effect Simulation results show the correctness of this predistortion linearization method. Its linearization performance is better than that using the direct inverse indirect learning structure.%理论推导证明了预失真器和射频功放两个无记忆的非线性系统的顺序可交换,针对常用的预失真学习结构的不足,提出了将直接型和间接型相结合的新预失真学习结构,该方法简单且易实现,并将该射频功放预失真线性化方法推广到了有记忆效应的情况.仿真结果表明,所提出的预失真线性化方法可行,其线性化性能优于采用直接逆间接学习结构的情况.
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