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http://dx.doi.org/10.5573/ieek.2013.50.7.034

Comparison and Performance analysis of Wavelet OFDM system and FD-OFDM  

Lee, Junseo (Department of Electronics and Computer Engineering, Chungnam University)
Kim, Ji-Hoon (Department of Electronics and Computer Engineering, Chungnam University)
Kim, Whanwoo (Department of Electronics and Computer Engineering, Chungnam University)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.50, no.7, 2013 , pp. 34-42 More about this Journal
Abstract
In this paper, we compare the performance of wavelet OFDM (Orthogonal Frequency Division Multiplexing) and FD-OFDM(Frequency diversity OFDM) system with conventional OFDM system. Wavelet OFDM system uses wavelet transform rather than Fourier transform and contains intermediate characteristics of CDM (Code Division Multiplexing) and OFDM. In wavelet OFDM system, inter-symbol interference (ISI) can be suppressed effectively and adjacent channel interference can be also minimized well. In FD-OFDM system, each parallel branch symbol is multiplied by the orthogonal sequence and distributed into all sub-carriers. Then, each sub-carrier transmits information composed of the symbol components of all parallel branches in the given frame. FD-OFDM contains the frequency diversity characteristic and, therefore, FD-OFDM can be robust to the narrowband interference. For the comparison among different systems, BER (Bit-Error Rate) performances are evaluated in the presence of narrow-band interference and a harmonic noise channel. From the evaluation results, compared to the conventional OFDM, wavelet OFDM and FD-OFDM shows better robustness against the interference and, especially, wavelet OFDM is the most robust in harmonic noise channel.
Keywords
OFDM; frequency diversity; wavelet; narrow-band interference;
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