Synchronization of OFDM at low SNR over an AWGN channel

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    113 Downloads (Pure)

    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 languageUndefined
    Title of host publicationProceedings of the 3rd Wireless World Workshop (W3)
    EditorsD.C. Dimitrova, K.C.H. Blom, Nirvana Meratnia
    Place of PublicationEnschede, the Netherlands
    PublisherCentre for Telematics and Information Technology (CTIT)
    Pages1-10
    Number of pages10
    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
    ISSN (Electronic)0929-0672

    Workshop

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

    Keywords

    • METIS-284947
    • Differential phase shift keying
    • Frequency division multiplexing
    • EWI-21130
    • Modulation
    • IR-79128
    • Correlation
    • Fourier transforms

    Cite this

    Kokkeler, A. B. J., & Smit, G. J. M. (2011). Synchronization of OFDM at low SNR over an AWGN channel. In D. C. Dimitrova, K. C. H. Blom, & N. Meratnia (Eds.), Proceedings of the 3rd Wireless World Workshop (W3) (pp. 1-10). (CTIT workshop proceedings series; Vol. WP 11-05). Enschede, the Netherlands: Centre for Telematics and Information Technology (CTIT).
    Kokkeler, Andre B.J. ; Smit, Gerardus Johannes Maria. / Synchronization of OFDM at low SNR over an AWGN channel. Proceedings of the 3rd Wireless World Workshop (W3). editor / D.C. Dimitrova ; K.C.H. Blom ; Nirvana Meratnia. Enschede, the Netherlands : Centre for Telematics and Information Technology (CTIT), 2011. pp. 1-10 (CTIT workshop proceedings series).
    @inproceedings{6a472d4d407b4332b06b9ad0dbbda1b5,
    title = "Synchronization of OFDM at low SNR over an AWGN channel",
    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.",
    keywords = "METIS-284947, Differential phase shift keying, Frequency division multiplexing, EWI-21130, Modulation, IR-79128, Correlation, Fourier transforms",
    author = "Kokkeler, {Andre B.J.} and Smit, {Gerardus Johannes Maria}",
    year = "2011",
    month = "9",
    day = "27",
    language = "Undefined",
    series = "CTIT workshop proceedings series",
    publisher = "Centre for Telematics and Information Technology (CTIT)",
    pages = "1--10",
    editor = "D.C. Dimitrova and K.C.H. Blom and Nirvana Meratnia",
    booktitle = "Proceedings of the 3rd Wireless World Workshop (W3)",
    address = "Netherlands",

    }

    Kokkeler, ABJ & Smit, GJM 2011, Synchronization of OFDM at low SNR over an AWGN channel. in DC Dimitrova, KCH Blom & N Meratnia (eds), Proceedings of the 3rd Wireless World Workshop (W3). CTIT workshop proceedings series, vol. WP 11-05, Centre for Telematics and Information Technology (CTIT), Enschede, the Netherlands, pp. 1-10, 3rd Wireless World Workshop, W3 2011, Enschede, Netherlands, 27/09/11.

    Synchronization of OFDM at low SNR over an AWGN channel. / Kokkeler, Andre B.J.; Smit, Gerardus Johannes Maria.

    Proceedings of the 3rd Wireless World Workshop (W3). ed. / D.C. Dimitrova; K.C.H. Blom; Nirvana Meratnia. Enschede, the Netherlands : Centre for Telematics and Information Technology (CTIT), 2011. p. 1-10 (CTIT workshop proceedings series; Vol. WP 11-05).

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    TY - GEN

    T1 - Synchronization of OFDM at low SNR over an AWGN channel

    AU - Kokkeler, Andre B.J.

    AU - Smit, Gerardus Johannes Maria

    PY - 2011/9/27

    Y1 - 2011/9/27

    N2 - 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.

    AB - 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.

    KW - METIS-284947

    KW - Differential phase shift keying

    KW - Frequency division multiplexing

    KW - EWI-21130

    KW - Modulation

    KW - IR-79128

    KW - Correlation

    KW - Fourier transforms

    M3 - Conference contribution

    T3 - CTIT workshop proceedings series

    SP - 1

    EP - 10

    BT - Proceedings of the 3rd Wireless World Workshop (W3)

    A2 - Dimitrova, D.C.

    A2 - Blom, K.C.H.

    A2 - Meratnia, Nirvana

    PB - Centre for Telematics and Information Technology (CTIT)

    CY - Enschede, the Netherlands

    ER -

    Kokkeler ABJ, Smit GJM. Synchronization of OFDM at low SNR over an AWGN channel. In Dimitrova DC, Blom KCH, Meratnia N, editors, Proceedings of the 3rd Wireless World Workshop (W3). Enschede, the Netherlands: Centre for Telematics and Information Technology (CTIT). 2011. p. 1-10. (CTIT workshop proceedings series).