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Equation-Method for correcting clipping errors in OFDM signals.

Nargis Bibi1, Anthony Kleerekoper2, Nazeer Muhammad3

  • 1Department of Computer Science, Fatima Jinnah Women University, The Mall, Rawalpindi, Pakistan.

Springerplus
|July 8, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces the Equation-Method to correct clipping distortion in Orthogonal Frequency Division Multiplexing (OFDM) signals. This novel technique effectively restores clipped peaks, improving wireless communication reliability.

Keywords:
ClippingEquation-MethodFFTOrthogonal frequency division multiplexing (OFDM)Square matrixSymbol error probability

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Wireless Communications

Background:

  • Orthogonal Frequency Division Multiplexing (OFDM) is crucial for 4G and wireless systems.
  • OFDM signals exhibit high peak-to-average power ratios, leading to non-linear distortion from High Power Amplifiers (HPAs).
  • Peak clipping is a common but error-inducing solution to mitigate HPA distortion.

Purpose of the Study:

  • To introduce and validate a novel technique, the Equation-Method, for correcting clipping-induced errors in OFDM signals.
  • To demonstrate the effectiveness of the Equation-Method across various clipping thresholds.
  • To address challenges related to numerical stability and receiver symbol differentiation.

Main Methods:

  • The Equation-Method utilizes the Fast Fourier Transform (FFT) to formulate and solve simultaneous equations.
  • These equations reconstruct the original amplitudes of clipped signal peaks.
  • Analytical derivations and simulations are employed for validation.

Main Results:

  • The Equation-Method analytically and computationally corrects all clipping errors over a broad range of clipping thresholds.
  • Numerical instability issues associated with the method can be avoided.
  • The study highlights the need for new receiver techniques to distinguish correctly from incorrectly received symbols.

Conclusions:

  • The Equation-Method offers a robust solution for mitigating clipping distortion in OFDM systems.
  • The technique shows promise for enhancing the reliability of wireless communication.
  • Further research is needed to develop receiver-side mechanisms for improved symbol error detection.