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    Equation-Method for correcting clipping errors in OFDM signals

    Bibi, N, Kleerekoper, A, Muhammad, N and Cheetham, B (2016) Equation-Method for correcting clipping errors in OFDM signals. SpringerPlus, 5. ISSN 2193-1801

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    Abstract

    Orthogonal frequency division multiplexing (OFDM) is the digital modulation technique used by 4G and many other wireless communication systems. OFDM signals have significant amplitude fluctuations resulting in high peak to average power ratios which can make an OFDM transmitter susceptible to non-linear distortion produced by its high power amplifiers (HPA). A simple and popular solution to this problem is to clip the peaks before an OFDM signal is applied to the HPA but this causes in-band distortion and introduces bit-errors at the receiver. In this paper we discuss a novel technique, which we call the Equation-Method, for correcting these errors. The Equation-Method uses the Fast Fourier Transform to create a set of simultaneous equations which, when solved, return the amplitudes of the peaks before they were clipped. We show analytically and through simulations that this method can, correct all clipping errors over a wide range of clipping thresholds. We show that numerical instability can be avoided and new techniques are needed to enable the receiver to differentiate between correctly and incorrectly received frequency-domain constellation symbols.

    Item Type: Article
    Peer-reviewed: Yes
    Date Deposited: 28 Oct 2016 14:36
    Publisher: SpringerOpen
    Additional Information: This is an Open Access article published in SpringerPlus, published by SpringerOpen, copyright The Author(s).
    Divisions: Faculties > Science and Engineering
    Research Centres > Centre for Advanced Computational Science
    Subject terms: Science & Technology, Multidisciplinary Sciences, Science & Technology - Other Topics, Clipping, Orthogonal frequency division multiplexing (OFDM), FFT, Square matrix, Equation-Method, Symbol error probability, AVERAGE POWER REDUCTION, PAPR REDUCTION, RATIO REDUCTION, SYSTEMS, SCHEME, ALGORITHM, Clipping, Equation-Method, FFT, Orthogonal frequency division multiplexing (OFDM), Square matrix, Symbol error probability
    URI: https://e-space.mmu.ac.uk/id/eprint/617339
    DOI: https://doi.org/10.1186/s40064-016-2413-0
    ISSN 2193-1801

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