一种有效的基于宽带功率放大器强记忆效应特性的PMEC预失真方法
doi: 10.3724/SP.J.1146.2011.00590
An Effective PMEC Predistortion Method Based on the Strong Memory Effect Characteristics of Broadband Power Amplifier
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摘要: 针对宽带功率放大器的强记忆效应特性，论文提出了一种新的预失真方法PMEC (Parallel MP-EMP-CIMT)，该方法基于记忆多项式(MP)，包络记忆多项式(EMP)及记忆时刻信号交叉项(CIMT)3个基函数构造预失真器。与传统混合记忆多项式(HME)方法相比，PMEC方法增加了记忆时刻信号间的交叉相乘项，此外，为了解决系统复杂度高的问题，对EMP子预失真器进行了简化并截断了CIMT子预失真器的高阶非线性项。实际测试结果表明，PMEC方法比MP方法和HME方法能带来更好的线性化效果，与MP方法相比，PMEC方法将输出信号的三阶邻信道功率比(ACPR)降低了1.07 dB/1.32 dB，预失真系数量节省了18.75%；与HME方法相比，PMEC方法利用79.59%的预失真系数将输出信号的三阶ACPR降低了0.2 dB/0.99 dB。Abstract: 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.
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Key words:
- Wireless communication /
- Predistortion /
- Memory Polynomial (MP) /
- Power amplifier
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