Synchronization of OFDM at low SNR over an AWGN channel

André B.J. Kokkeler, Gerard J.M. Smit

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    Abstract

    This paper is based on Extended Symbol OFDM (ES-OFDM) where symbols are extended in time. This way ES-OFDM can operate at low SNR. Each doubling of the symbol length improves the SNR performance by 3 dB in case of a coherent receiver. One of the basic questions is how to synchronize to signals far below the noise floor. An algorithm is presented which is based on the transmission of pilot symbols. At the receiver, the received signal is cross correlated with the known pilot symbol and the maximum magnitude is determined. The position of the maximum value within the cross correlation function indicates the time difference between transmitter and receiver. The performance of the algorithm in case of an Additive White Gaussian Noise (AWGN) channel, is assessed based on a theoretical approximation of the probability of correct detection of the time difference. The theoretical approximation matches with simulation results and shows that synchronization can be achieved for low (negative) SNRs.
    Original languageEnglish
    Title of host publicationProceedings of the 3rd Wireless World Workshop (W3)
    EditorsDesislava Dimitrova, Koen Blom, Nirvana Meratnia
    Place of PublicationEnschede, the Netherlands
    PublisherCentre for Telematics and Information Technology (CTIT)
    Number of pages10
    DOIs
    Publication statusPublished - 27 Sep 2011
    Event3rd Wireless World Workshop, W3 2011 - Enschede, Netherlands
    Duration: 27 Sep 201127 Sep 2011
    Conference number: 3

    Publication series

    NameCTIT workshop proceedings series
    PublisherCTIT
    VolumeWP 11-05
    ISSN (Print)0929-0672

    Workshop

    Workshop3rd Wireless World Workshop, W3 2011
    Abbreviated titleW3 2011
    Country/TerritoryNetherlands
    CityEnschede
    Period27/09/1127/09/11

    Keywords

    • Differential phase shift keying
    • Frequency division multiplexing
    • Modulation
    • Correlation
    • Fourier transforms

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