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A wide-range frequency offset estimation algorithm is proposed for optical coherent systems, which removes the modulated phase information from the received signal accurately using training sequence instead of traditionalMth power operation. A large frequency offset approximating to ±0.5 times the symbol rate can be traced in arbitraryM-ary phase-shift-keying (MPSK)M-ary quadrature amplitude modulation (MQAM) systems by the proposed algorithm with the low computational complexity and the negligible training overhead.
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Zhou et al. (2011) studied this question.
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