Introduction to Multibiometrics

This paper addresses the problem of blind estimation of the timing error and the carrier frequency offset in Orthogonal Frequency Division Multiplexing systems employing Cyclic Prefix

Arun Ross

2007

Scholarcy highlights

  • The Orthogonal Frequency Division Multiplexing modulation is being adopted in several present and future high rate wireless communications standards
  • OFDM modulations including a Cyclic Prefix are here considered where a copy of the last part of the OFDM symbol is inserted within the guard interval
  • This paper addresses the problem of blind estimation of the timing error and the carrier frequency offset in OFDM systems employing CP
  • Several blind synchronization methods use the cyclostationarity of OFDM signals, such as quoted in previous research where it is shown that for non circular constellations, the frequency offset can be recovered from the cyclic frequencies of the received signal via the maximization of a sum of cyclic autocorrelation coefficients
  • The power spectrum and spectral correlation of OFDM signals are evaluated based on frequency domain transformed signals
  • Enhanced accuracy is obtained with respect to the approach exploiting the temporal autocorrelation and cyclic autocorrelation
  • No channel knowledge is required to apply the proposed estimators

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