Impulse noise correction in OFDM systems

Renfei Liu, Te Lung Kung, Keshab K Parhi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In orthogonal frequency division multiplexing (OFDM) systems, the impulse noise causes catastrophic accuracy degradation since the impulse noise affects all the subcarriers in a symbol due to the fast Fourier transform (FFT) operations at the receiver. Potential causes of impulse noise include erasure channel, power switching, and circuit failure in integrated circuits. In this paper, from a practical observation, a novel iterative impulse error correction scheme is proposed. This scheme is referred to as the impulse noise location and value search algorithm, which is based on the crucial observation of the relationship of the impulse noise and the symbol constellation. In a 512-FFT OFDM system at 25 dB additive white Gaussian noise signal-to-noise ratio, for quadrature amplitude modulation (QAM)-4 and QAM-8 modulation, simulation results show that our proposed novel scheme can effectively correct impulse errors that corrupt up to 20.7 % and 13.9 % of the received time-domain signal at known locations. In addition, without the knowledge of impulse noise location, the proposed scheme still can correct at least 9.96 % of the received time-domain signal for QAM-4 modulation.

Original languageEnglish (US)
Pages (from-to)245-262
Number of pages18
JournalJournal of Signal Processing Systems
Volume74
Issue number2
DOIs
StatePublished - Feb 1 2014

Fingerprint

Impulse Noise
Impulse noise
Orthogonal Frequency Division multiplexing (OFDM)
Orthogonal frequency division multiplexing
Quadrature Amplitude Modulation
Quadrature amplitude modulation
Fast Fourier transform
Impulse
Fast Fourier transforms
Time Domain
Modulation
Gaussian White Noise
Error correction
Error Correction
Integrated Circuits
Search Algorithm
Integrated circuits
Signal to noise ratio
Degradation
Receiver

Keywords

  • Decoder
  • Demodulation
  • FFT/IFFT
  • Impulse noise
  • OFDM

Cite this

Impulse noise correction in OFDM systems. / Liu, Renfei; Kung, Te Lung; Parhi, Keshab K.

In: Journal of Signal Processing Systems, Vol. 74, No. 2, 01.02.2014, p. 245-262.

Research output: Contribution to journalArticle

Liu, Renfei ; Kung, Te Lung ; Parhi, Keshab K. / Impulse noise correction in OFDM systems. In: Journal of Signal Processing Systems. 2014 ; Vol. 74, No. 2. pp. 245-262.
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