基于Chebyshev正交多项式滤波器实现HPA自适应预失真

Adaptive Predistortion for HPA＇s Nonlinear Based on Chebyshev Orthogonal Polynomials Filter

在全数字正交调制体制下，推导了辨识模式和非辨识模式的无记忆非线性HPA预失真方法及其自适应算法。鉴于Chebyshev正交多项式具有逼近任意非线性函数的特点，提出基于Chebyshev正交多项式滤波器实现HPA的自适应预失真。仿真结果表明，该数字预失真方法补偿效果好，自适应能力强，性能稳定。

Within a fully digital orthogonal modulation structure, this paper presents two memoryless predistorters to compensate for the nonlinear distortion caused by high power amplifier （HPA） on satellite transponder respectively with identification and without identification. As Chebyshev orthogonal polynomial can approximate any nonlinear function, a digital adaptive predistortion algorithm based on Chebyshev orthogonal polynomials filter is proposed. The result of simulation shows that the digital predistortion algorithm provides high level effectiveness, adaptive performance and robustness.