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Fractional wavelet transform based OFDM system with cancellation of ICI

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Abstract

The future of wireless communication systems stimulate researchers to improve bandwidth efficiency and data rate by carrying out several analyses. The reliability of multiple input multiple output (MIMO) combined with orthogonal frequency division multiplexing (OFDM) in wireless communication is reduced by frequency error. This leads to damage of orthogonality between sub-carriers and induces inter carrier interference (ICI). To overcome this problem in conventional OFDM system, cyclic prefix is used. In this work, a novel technique named fractional wavelet transform (FrWT) is proposed. The FrWT reduces the effect of ICI in conventional system without any usage of cyclic prefix. Also, the bandwidth efficiency is improved due to its orthogonal wavelets and absence of cyclic prefix. The proposed work investigates the performance of FrWT-OFDM model and tested against carrier frequency offsets. The efficiency of ICI self cancellation technique in mitigating the effect of frequency offsets is analysed. The efficiency of proposed model is highlighted by comparing with existing FFT and wavelet based OFDM system by means of bit error rate (BER). Simulation results show reduced BER of 10−4.8 at 8 dB SNR for the proposed model with a normalized carrier frequency offset value of 0.1. Thus the effect of ICI is reduced efficiently for proposed transform in OFDM.

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  1. School of Electrical Engineering, Vellore Institute of Technology, Vellore, India

    Ayeswarya R & Amutha Prabha N

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  1. Ayeswarya R
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  2. Amutha Prabha N
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Correspondence to Amutha Prabha N.

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R, A., N, A.P. Fractional wavelet transform based OFDM system with cancellation of ICI. J Ambient Intell Human Comput (2019). https://doi.org/10.1007/s12652-019-01191-8

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