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KALMAN FILTERING APPLIED TO CARRIER RECOVERY OF HIGH-ORDER QAM SIGNALS

A carrier synchronization algorithm for high-order QAM modulated signals that uses Kalman filtering techniques shows fast acquisition times and good frequency tracking performances. The algorithm relies on a decision directed extended Kalman filter combined with a lock detector which determines the status of the synchronization process, modifying consequently the filter parameters. Simulations performed both on 64-QAM and 256-QAM show similar or better performances than usual PLL synchronization loops.