Timing and phase offset sensitivity of autocorrelation based frequency estimation in an FH-OFDM system

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    6 Citations (Scopus)


    In this paper, a new aspect on the problem of carrier frequency offset (CFO) estimation is studied in a frequency-hopping (FH) orthogonal frequency division multiplexing (OFDM) system. Unlike in a traditional nonhopped OFDM system, in FH-OFDM system it is important to verify how accurately frequency-switching must be performed before the CFO estimation can take place with adequate performance. The accuracy of frequency-switching is evaluated through frequency-hopping timing offset (FHO) and frequency-hopping phase offset (PHO) between the received signal and the signal produced by the local frequency-hopping synthesizer of the receiver. The target system uses ultra-wideband (UWB) in order to achieve very high data rate of 1.6 Gbit/s. The performance of selected autocorrelation based algorithms is simulated in multipath fading channel under the FHO and PHO, and the results are compared to the performance of ideal frequency-switching and the corresponding analytical Cramer-Rao bound. It is found that the CFO estimators based on autocorrelation principle are quite robust to the FHO less than half the hopping period. Furthermore, simple methods are proposed to compensate the degradation caused by the FHO. The estimators are, however, sensitive to the PHO caused by the possible lack of phase memory in the frequency-hopping synthesizer resulting in a significant bias to the CFO estimate.
    Original languageEnglish
    Title of host publication2007 IEEE 65th Vehicular Technology Conference
    Subtitle of host publicationVTC2007-Spring
    PublisherIEEE Institute of Electrical and Electronic Engineers
    ISBN (Print)978-1-4244-0266-3
    Publication statusPublished - 2007
    MoE publication typeA4 Article in a conference publication
    EventIEEE 65th Vehicular Technology Conference, VTC2007-Spring - Dublin, Ireland
    Duration: 22 Apr 200725 Apr 2007
    Conference number: 65


    ConferenceIEEE 65th Vehicular Technology Conference, VTC2007-Spring
    Abbreviated titleVTC2007-Spring


    • multicarrier modulation
    • very high data rate
    • ultra-wideband
    • imperfect frequency-hopping


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