科研之友
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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 predistorter is easy to design.
