Iterative decision-directed estimation and compensation of nonlinear distortion effects for OFDM systems

Haris Gacanin, Fumiyuki Adachi

    Research output: Contribution to journalArticlepeer-review

    2 Citations (Scopus)

    Abstract

    Orthogonal frequency division multiplexing (OFDM) has been adopted for several wireless network standards due to its robustness against multipath fading. Main drawback of OFDM is its high peak-to-average power ratio (PAPR) that causes a signal degradation in a peak-limiting (e.g., clipping) channel leading to a higher bit error rate (BER). At the receiver end, the effect of peak limitation can be removed to some extent to improve the system performance. In this paper, a joint iterative channel estimation/equalization and clipping noise reduction technique based on minimum mean square error (MMSE) criterion is presented. The equalization weight that minimizes the mean square error (MSE) between the signal after channel equalization and feedback signal after clipping noise reduction is derived assuming imperfect channel state information (CSI). The MSE performance of the proposed technique is theoretically evaluated. It is shown that the BER performance of OFDM with proposed technique can be significantly improved in a peak-limited and doubly-selective (i.e., time- and frequency-selective) fading channel.

    Original languageEnglish
    Pages (from-to)1558-1566
    Number of pages9
    JournalWireless Communications and Mobile Computing
    Volume12
    Issue number17
    DOIs
    Publication statusPublished - 2012 Dec 10

    Keywords

    • OFDM
    • clipping
    • decision-feedback frequency domain equalization
    • fast fading

    ASJC Scopus subject areas

    • Information Systems
    • Computer Networks and Communications
    • Electrical and Electronic Engineering

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