Author(s)

Xiaoyang Zheng, Zhengyuan Wei, Xiaozeng Xu

College of Mathematics and Statistics, Chongqing University of Technology, Chongqing, China.

In this paper, a novel technique for power amplifier (PA) linearization is presented. The Legendre wavelet neural networks (LWNN) is first utilized to model PA and inverse structure of the PA by applying practical transmission signals and the gradient descent algorithm is applied to estimate the coefficients of the LWNN. Secondly, this technique is implemented to identify and optimize the coefficient parameters of the proposed pre-distorter (PD), i.e., the inversion model of the PA. The proposed method is most efficient and the pre-distorter shows stability and effectiveness because of the rich properties of the LWNN. A quite significant improvement in linearity is achieved based on the measured data of the PA characteristics and out power spectrum has been compared.

Power Amplifier, Pre-Distortion, Legendre Wavelet, Legendre Wavelet Neural Networks

Zheng, X. , Wei, Z. and Xu, X. (2014) Legendre Wavelet Neural Networks for Power Amplifier Linearization. Applied Mathematics, 5, 3249-3255. doi: 10.4236/am.2014.520302.