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中文摘要：
针对由正交多项式设计的功率放大器预失真系统,提出一种系数可变的多项式预失真器,并给出相应的实现结构.该预失真多项式有多组系数组合,随着输入信号幅度的不同,多项式选取不同的系数组合,从而降低估计误差.仿真分析表明,当使用2,4和8组系数时,相对于传统的正交多项式,采用该算法得到的估计误差可达到6.0 dB,23.6 dB和42.7 dB的增益,对应得到10 dB,30 dB和50 dB的带外谱抑制增益.该方法降低了预失真器设计中对多项式阶数的要求,提高了设计的灵活性,降低了预失真器后低通滤波器的设计难度.
英文摘要：
For the predistorter that is designed by orthogonal polynomial, a novel variable coefficient polynomial predistorter, which has many coefficient combinations, with the corresponding realizing structure was proposed. Different polynomial coefficient combination was selected as input signal amplitude changes for the purpose of error decreasing. Computer simulations show that the correction error can decrease 6.0 dB,23.6 dB and 42.7 dB. The spectral regrowth can suppress 10 dB, 30 dB and 50 dB based on the orthogonal polynomial. The novel polynomial can decrease the number of polynomial order. Therefore, its hardware implementation is flexible and the low pass filter followed predistotter is easy to design.
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