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An Approximate Maximum Likelihood Time Synchronization Algorithm for Zero-padded OFDM in Channels with Impulsive Gaussian Noise

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Document pages: 10 pages

Abstract: In wireless communication systems, Orthogonal Frequency-Division Multiplexing(OFDM) includes variants using either a cyclic prefix (CP) or a zero padding(ZP) as the guard interval to avoid inter-symbol interference. OFDM is ideallysuited to deal with frequency-selective channels and additive white Gaussiannoise (AWGN); however, its performance may be dramatically degraded in thepresence of impulse noise. While the ZP variants of OFDM exhibit lower biterror rate (BER)and higher energy efficiency compared to their CPcounterparts,they demand strict time synchronization, which is challenging inthe absence of pilot and CP. Moreover, on the contrary to AWGN, impulse noiseseverely corrupts data. In this paper, a new low-complexity timing offset (TO)estimator for ZP-OFDM for practical impulsive-noise environments is proposed,where relies on the second-other statistics of the multipath fading channel andnoise. Performance comparison with existing TO estimators demonstrates either asuperior performance in terms of lock-in probability or a significantly lowercomplexity over a wide range of signal-to-noise ratio (SNR) for variouspractical scenarios.

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