Acta Metallurgica Sinica(English letters) ›› 2014, Vol. 21 ›› Issue (3): 18-22.doi: 10.1016/S1005-8885(14)60296-X

• Wireless • Previous Articles     Next Articles

Cancellation of nonlinear distortion based on integration of FCM clustering algorithm and adaptive-two-stage linear approximation

王桂叶 邹卫霞 王振宇 杜光龙 GAO Ying   

  1. 1. Key laboratory of wireless universal communications, Beijing University of Posts and Telecommunications, Beijing 100876, China 2. School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2013-06-21 Revised:2014-05-11 Online:2014-06-30 Published:2014-06-30
  • Contact: Rebecca Wang E-mail:guiyexieyun@163.com
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (61171104).

Abstract:

This paper presents a new hybrid system of the fuzzy c-means clustering algorithm and adaptive-two-stage linear approximation for the nonlinear distortion cancellation of the RF power amplifier (PA). This mechanism can eliminate the noise, adaptively model the PA’s instantaneous change, and then correct the nonlinear distortion efficiently. The paper puts forward using the FCM clustering algorithm for clustering the received signal to eliminate white noise, and then uses adaptive-two-stage linear approximation to fit the inverse function of the amplitude’s and phase’s nonlinear mapping in the training phase. Firstly, the parameters involved in the linear function and the similarity function are trained using gradient-descent and minimum mean-square error criterion. Secondly, the sample signals directly employ the proposed approach’s training result to eliminate nonlinear distortion. This hybrid method is easier to realize than the multi-segment linear approximation and could more efficiently reduce the received signal’s BER.

Key words:

PA, nonlinear distortion cancellation, FCM clustering algorithm, similarity function, adaptive-two-stage linear approximation

CLC Number: