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We propose blind maximum-likelihood carrier frequency offset (CFO) estimation for coherent fast OFDM receivers. Simulation results show that the estimation algorithm can greatly enhance the CFO tolerance, and is insensitive to chromatic dispersion.
Multi-chip joint maximum likelihood sequence estimation (MLSE) is proposed and shown to outperform joint MLSE, achieving 330 km optically-uncompensated 10 GS/s DQPSK signal transmission and less than 3 dB OSNR penalty for 100 ps DGD.
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