在这篇文章,基于最不方形的评价,为间接学习结构 predistorter 的一个递归的算法被介绍。模拟结果显示出所有多项式 predistorter 的非线性的术语,高顺序(比 7th 顺序高) 非线性的术语是那么次要的他们能在实际 predistorter 被省略设计。那么,与高顺序的多项式构造 predistorter 是不必要的,并且算法将总是是稳定的。进一步的结果证明甚至当 15th 顺序多项式模型被使用时,算法在 10 次重复以后是会聚的,并且它能由 64 dB 改进 20 MHz 带宽信号的外面乐队光谱,与一 1.2 ??????????????? 儠卯吗??
In this article, based on least square estimation, a recursive algorithm for indirect learning structure predistorter is introduced. Simulation results show that of all polynomial predistorter nonlinear terms, higher-order (higher than 7th-order) nonlinear terms are so minor that they can be omitted in practical predistorter design. So, it is unnecessary to construct predistorter with higher-order polynomials, and the algorithm will always be stable. Further results show that even when 15th-order polynomial model is used, the algorithm is convergent after 10 iterations, and it can improve out-band spectrum of 20 MHz bandwidth signal by 64 dB, with a 1.2×10^11 matrix condition number.