Sensitivity of FFT-Equalized Zero-Padded OFDM Systems to Time and Frequency Synchronization Errors
Konferenz: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
11.09.2005 - 14.09.2005 in Berlin, Germany
Tagungsband: PIMRC 2005
Seiten: 5Sprache: EnglischTyp: PDF
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Autoren:
Athaudage, C. R. N.; Angiras, R. R. V. (ARC Special Research Center for Ultra-Broadband Infirmation Networks, an Affiliated Program of National ICT Australia, Department of Electrical and Electronic Engineering, University of Melbourne, Australia)
Inhalt:
In this paper, we provide a detail analysis of the performance of FFT-equalized (FFT-EQ) zero-padded OFDM (ZP-OFDM) systems in the presence of time and frequency synchronization errors. In order to achieve low-complexity in equalization, FFT-based demodulation and per subcarrier channel equalization is considered for ZP-OFDM. It is shown that, unlike in cyclic-prefix OFDM (CP-OFDM), FFT-equalized ZP-OFDM is sensitive to time synchronization error causing ICI. An exact expression for ICI is derived in terms of time and frequency synchronization errors for both AWGN and frequency-selective Rayleigh fading channels. Moreover, based on the Gaussian approximation for the ICI noise, expressions are derived for the symbol-error-probability (SEP) of a FFT-EQ-ZP-OFDM system with time and frequency synchronization errors in both AWGN and frequency-selective Rayleigh fading channels. Numerical results demonstrate the sensitivity of FFT-EQ-ZP-OFDM systems to synchronization errors.