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On the Performance of FFT/DWT/DCT-based OFDM Systems with Chaotic Interleaving and Channel Estimation Algorithms

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Abstract

The efficiency of data transmission over fading channels in orthogonal frequency division multiplexing (OFDM) systems depends on the employed interleaving method. In this study, we propose an improved chaotic interleaving scheme which aims to improve the performance of OFDM system under fading channel. In the proposed scheme, the binary data is interleaved with chaotic Baker map prior to the modulation process. In the sequel, significant degree of encryption is being added during data transmission. The performance of the proposed approach is tested on the conventional fast Fourier transform OFDM, discrete wavelet transform OFDM, and discrete cosine transform OFDM with and without chaotic interleaving. Furthermore, an expectation–maximization (EM) algorithm is proposed for improving channel impulse response (CIR) estimation based on a maximum likelihood principle. The proposed scheme makes use of EM algorithm to update the channel estimates until convergence is reached. The simulation results show the efficiency of the proposed algorithms under Rayleigh fading environments where the symbol error rate essentially coincides with that of the perfect channel case after the fifth EM iteration.

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Acknowledgments

We would like to thank Dr. Mohamed Marey for his participation in this work and his useful comments which enhanced the paper content.

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Authors and Affiliations

  1. Faculty of Engineering, El-Shorouk Academy, Cairo, Egypt

    Zahraa Abdel Hamid & Hamed El Shenawy

  2. Equinox International, Cairo, Egypt

    Moataz Samir

  3. Department of Electronics and Electrical Communications, Faculty of Electronic Engineering, Menoufia University, Menouf, 32952, Egypt

    Saied M. Abd El-atty & Fathi E. Abd El-Samie

  4. Department of Electronics and Electrical Communication Engineering, Faculty of Engineering, Ain Shams University, Cairo, Egypt

    Adel E. El-Hennawy

  5. Electrical Engineering Department, KACST-TIC in Radio Frequency and Photonics for the e-Society (RFTONICS), King Saud University, Riyadh, Kingdom of Saudi Arabia

    Saleh A. Alshebeili

  6. KACST-TIC in Radio Frequency and Photonics for the e-Society (RFTONICS), King Saud University, Riyadh, Kingdom of Saudi Arabia

    Fathi E. Abd El-Samie

Authors
  1. Zahraa Abdel Hamid
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  2. Moataz Samir
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  3. Saied M. Abd El-atty
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  4. Adel E. El-Hennawy
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  5. Hamed El Shenawy
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  6. Saleh A. Alshebeili
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  7. Fathi E. Abd El-Samie
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Corresponding author

Correspondence to Fathi E. Abd El-Samie.

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Hamid, Z.A., Samir, M., Abd El-atty, S.M. et al. On the Performance of FFT/DWT/DCT-based OFDM Systems with Chaotic Interleaving and Channel Estimation Algorithms. Wireless Pers Commun 78, 1495–1510 (2014). https://doi.org/10.1007/s11277-014-1830-z

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  • DOI: https://doi.org/10.1007/s11277-014-1830-z

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