Phase tracking capability is incorporated into two sequence estimation decoders for continuous phase modulations. One decoder employs the Viterbi algorithm; the other uses a reduced-survivor approach proposed earlier by one of the authors [9] for the more bandwidtn efficient of these modulations.Computational complexity with the simplest of the algorithms is only marginally greater than that required for an equivalent decoder employing an external carrier recovery circuit Simulations with representative partial response modulations demonstrate the phase synchronization and tracking capabilities of the decoders. High SNR losses relative to an optimal receiver having perfect phase knowledge are found to be small (～ 1db).
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