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Enhanced DWT-OFDM communication system using wavelet domain equalizer with Co-CFO.

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Summary
This summary is machine-generated.

This study introduces a Joint Low Complexity Regularized Zero Forcing-Wavelet Domain Equalizer (JLCRLZF-WDE) for Multiple-Input-Multiple-Output Discrete Wavelet Transform-Orthogonal Frequency Division Multiplexing (MIMO DWT-OFDM) systems. The new equalizer significantly improves Bit-Error-Rate (BER) performance and reduces simulation time compared to existing methods.

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Area of Science:

  • Signal Processing
  • Wireless Communications
  • Information Theory

Background:

  • Discrete Fourier Transform (DFT) based Orthogonal Frequency Division Multiplexing (OFDM) faces limitations in certain communication scenarios.
  • Discrete Wavelet Transform (DWT) offers advantages for OFDM design, particularly in Multiple-Input-Multiple-Output (MIMO) systems.
  • Existing equalization techniques may not fully leverage the benefits of DWT in MIMO-OFDM.

Purpose of the Study:

  • To propose a novel Joint Low Complexity Regularized Zero Forcing-Wavelet Domain Equalizer (JLCRLZF-WDE).
  • To enhance the performance of MIMO DWT-OFDM systems by reducing Bit-Error-Rate (BER) and simulation time.
  • To compare the proposed equalizer against conventional Frequency Domain Equalizers (FDEs) and Wavelet Domain Equalizers (WDEs).

Main Methods:

  • Development and simulation of the JLCRLZF-WDE for MIMO DWT-OFDM systems.
  • Performance evaluation under Co-Carrier Frequency Offset (Co-CFO) Rayleigh fading channel conditions.
  • Comparative analysis of BER and simulated time against Linear Zero Forcing (LZF)-FDE and Linear Minimum Mean Square Error (LMMSE)-WDE/FDE schemes.

Main Results:

  • The JLCRLZF-WDE requires minimal additional Signal-to-Noise Ratio (SNR) (0.82 dB at BER = 10⁻³, 0.27 dB at BER = 10⁻⁴) to match LMMSE-WDE performance.
  • Conventional equalizers (LZF-FDE, LMMSE-FDE) require significantly higher SNR (0.31 dB to 15.35 dB difference).
  • The proposed scheme reduces simulation time by 3.17% (vs. LMMSE-WDE) and 12.4% (vs. DFT-based LMMSE-FDE).

Conclusions:

  • The JLCRLZF-WDE is a highly effective equalizer for MIMO DWT-OFDM systems.
  • It offers superior BER performance and computational efficiency compared to conventional equalization methods.
  • The proposed equalizer presents a viable solution for improving wireless communication system performance.