Multisymbol QPSK Partitioning for Improved Frequency Offset Estimation of 16-QAM Signals


We propose and investigate a generalized quadrature phase-shift keying (QPSK) partitioning algorithm for carrier frequency offset (CFO) estimation in coherent optical 16-quadrature amplitude modulation (QAM) receivers. The algorithm utilizes the phase difference between the samples with different time-domain separations, so that the estimation accuracy can… (More)

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