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Adaptive Digital Predistorter Using the NLMS Algorithm for the Nonlinear Compensation of the OFDM Communication System  

Kim Sang-Woo (Dept. of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
Hieu Nguyen Thanh (Dept. of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
Kang Byoung-Moo (Dept. of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
Ryu Heung-Gyoon (Dept. of Electronic Engineering and Research Institute of Computer, Information & Communication, Chungbuk National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.4, 2005 , pp. 389-396 More about this Journal
Abstract
In this paper, we propose a pre-distortion method using the NLMS(Normalized Least Mean Square) algorithm to cope with hish PAPR(Peak to Average Power Ratio) problem in OFDM communication system. This proposed scheme estimates the distortion characteristics of HPA, and changes the characteristic against the distortion. Therefore, it can be shown that the adaptive characteristic of the NLMS pre-distorter is good to track the various nonlinear characteristic of HPA, even though HPA characteristic is changed by temperature variation or aging. From the performance analysis, SNR efficiency of NLMS pre-distorter is about $0.5\;\cal{dB}$ less than that of common numerical non-adaptive pre-distorter, when IBO(Input Back Off) is $0\;\cal{dB}$. However, the NLMS pre-distorter is better than the common numerical pre-distorter, because these two pre-distorters have similar performance in higher than $3\;\cal{dB}$ IBO, and the NLMS pre-distorter maintains the constant performance even though characteristic of HPA is changed.
Keywords
Adaptive Digital Pre-Distorter; NLMS Algorithm; Nonlinear Compensation; OFDM Communication;
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  • Reference
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