Title

A fast new method to mitigate amplifier-induced ICI in OFDM systems based on predistortion in DFT domain

Document Type

Conference Proceeding

Publication Date

8-19-2013

Abstract

We consider the problem of inter-carrier interference (ICI) in orthogonal frequency division multiplexing (OFDM) signals stemming from nonlinearities of power amplifiers (PA). OFDM signals often provoke amplifier nonlinearities due to their high peak-to-average power ratio. Predistortion is often considered in order to mitigate the resulting ICI. We consider a digital baseband predistorter based on the memory polynomial model. The predistorter is designed in the frequency domain using the the indirect training and the linear minimum mean-squared error (LMMSE) estimation method. It is shown that the proposed algorithm has a very low computation complexity and is scalable for systems with a large number of subcarriers. The simulation results show that for similar computational complexities, the proposed method has a significant performance improvement in the sense of total degradation compared to the methods in [1] and [2]. © 2013 IEEE.

Publication Source (Journal or Book title)

2013 5th International Conference on Modeling, Simulation and Applied Optimization, ICMSAO 2013

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