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Nonlinear Distortion Effects of OFDM Signals in a Radio over fiber Link Involving in a Mach-Zehnder Modulator  

Islam A.H.M. Razibul (경희대학교 전자정보대학 통신연구실)
Song, Ju-Bin (경희대학교 전자정보대학 통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.10A, 2006 , pp. 935-942 More about this Journal
Abstract
The performance of ROF systems can be severely degraded due to nonlinear effects in the channel. Also, Orthogonal Frequency Division Multiplex(OFDM), as a standard for broadband wireless and mobile internet networks, is being proposed for deployment with ROF systems to facilitate the total performance of a system. In this paper, at first, the performance of the OFDM-based RoF system with a Mach-Zehnder(MZ) modulator distortion effects has been analyzed at 5.8GHz. Evaluation of mean-squared error of the proposed OFDM-RoF system was carried out to compare with the conventional single carrier system based RoF link after the modulator distortion case and also for fixed signal to noise ratio(SNR) of 20dB using undistorted OFDM signal. Nominal and offset baising pre-distortion techniques are applied in proposed system to linearize the OFDM-RoF link. Finally, a comparison between the aforementioned pre-distortion techniques applied showed important observation in terms of distortion-free dynamic range and SNR to choose offset pre-distortion technique for our proposed system.
Keywords
Nonlinear Distortion Effects; Rof Link; Ofdm Signals; Bcn;
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