A Correlating Receiver for OFDM at Low SNR

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    Abstract

    By extending OFDM symbols, acceptable BER performance can be achieved at low SNRs. Two alternative differential receiver architectures are presented, a receiver based on a FX correlator (Fourier transformation before correlation) and based on an XF correlator (correlation before Fourier transformation). To reduce the complexity and hence the power consumption of both the ADC and the first digital processing stage single- or two bit quantization is used. The receiver based on the XF correlator is more suited to exploit such coarse quantization. Two basic effects are visible if coarse quantization is used. First, the BER performance is reduced due to the introduction of quantization errors. Second, beyond certain SNR levels, the BER performance does not increase due to the correlation between quantization errors. Furthermore, oversampling increases BER performance considerably. For single bit quantization with oversampling, acceptable BERs (< 10 −3) can be achieved for a limited SNR range for symbol extension factors of 32 and 64. In case of two bit quantization without oversampling, the results are comparable with single bit quantization with two times oversampling. For two bit quantization in combination with two times oversampling, acceptable BERs are achieved for symbol extension factors 8, 16, 31 and 64.
    Original languageUndefined
    Title of host publicationIEEE 73rd Vehicular Technology Conference Fall (VTC 2011-Spring)
    Place of PublicationUSA
    PublisherIEEE Vehicular Technology Society
    Pages1-5
    Number of pages5
    ISBN (Print)978-1-4244-8329-7
    DOIs
    Publication statusPublished - May 2011
    EventIEEE 73rd Vehicular Technology Conference, VTC 2011-Spring - Budapest, Hungary
    Duration: 15 May 201118 May 2011
    Conference number: 73
    http://www.ieeevtc.org/vtc2011spring/

    Publication series

    Name
    PublisherIEEE Vehicular Technology Society

    Conference

    ConferenceIEEE 73rd Vehicular Technology Conference, VTC 2011-Spring
    Abbreviated titleVTC Spring 2011
    CountryHungary
    CityBudapest
    Period15/05/1118/05/11
    Internet address

    Keywords

    • METIS-278715
    • Frequency division multiplexing
    • Fourier transforms
    • Differential phase shift keying
    • IR-77922
    • EWI-20177
    • Terms—Correlation
    • Modulation

    Cite this

    Kokkeler, A. B. J., & Smit, G. J. M. (2011). A Correlating Receiver for OFDM at Low SNR. In IEEE 73rd Vehicular Technology Conference Fall (VTC 2011-Spring) (pp. 1-5). USA: IEEE Vehicular Technology Society. https://doi.org/10.1109/VETECS.2011.5956427