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Wireless Personal Communications

, Volume 91, Issue 1, pp 419–438 | Cite as

Performance Enhancement of Discrete Multiwavelet Critical-Sampling Transform-Based OFDM System Using Hybrid Technique Under Different Channel Models

  • Sameer A. DawoodEmail author
  • F. Malek
  • M. S. Anuar
  • Suha Q. Hadi
Article

Abstract

A hybrid technique, which is a combination of the Fast Fourier Transform (FFT) and Sliding Window (SW) technique, is proposed for the development of new structure for Discrete Multiwavelet Critical-Sampling Transform based Orthogonal Frequency Division Multiplexing (DMWCST-OFDM) system under multipath fading channels with the Doppler frequency effect. FFT is utilized to increase the orthogonality of subcarriers against the multipath frequency-selective fading channels. SW technique reduces the fluctuation of signal amplitude, thereby reducing the Doppler frequency effect. This hybrid technique offers a good tradeoff between performance and complexity, where this technique needs more computations. However, it performs better than the standard DMWCST-OFDM system. The performance of the proposed system, called SW-DMWCST-OFDM, was compared to that of the standard DMWCST-OFDM, SW-FFT-OFDM, and FFT-OFDM systems under three channels, namely, additive white Gaussian noise, flat fading, and frequency-selective fading. The simulation results show that the proposed model performs better than the three other models in all types of channels.

Keywords

OFDM Multiwavelet transform Sliding window technique FFT Doppler effect 

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.School of Computer and Communication EngineeringUniversiti Malaysia Perlis (UniMAP)ArauMalaysia
  2. 2.School of Electrical Systems EngineeringUniversiti Malaysia Perlis (UniMAP)ArauMalaysia

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