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Blind symbol-timing and frequency-offset estimation in OFDM systems with real data symbols

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1 Author(s)
Tanda, M. ; Dipt. di Ingegneria Elettronica e delle Telecomunicazioni, Univ. di Napoli Federico, Italy

In this letter, the problem of blind symbol-timing and frequency-offset estimation in orthogonal frequency-division multiplexing (OFDM) systems with real data symbols is considered. Maximum-likelihood (ML) estimators for the parameters of interest have been derived by modeling the OFDM signal as a proper complex Gaussian random process. However, when data symbols belong to a real constellation, the received signal becomes an improper complex random process, and hence, previously mentioned estimators, termed cyclic prefix (CP) estimators, are not ML estimators. In this letter, minimum mean-squared error estimators exploiting the conjugate-symmetry property exhibited by the OFDM signal with real data symbols, termed MSR estimators, that greatly outperform CP estimators in additive noise channels, are derived. Moreover, a modified MSR symbol-timing estimator that can assure satisfactory performance in multipath fading channels is proposed.

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Communications, IEEE Transactions on  (Volume:52 ,  Issue: 10 )