A matched nonlinearity for phase estimation of a PSK-modulated carrier
IEEE Transactions on Information Theory
Detection, Estimation, and Modulation Theory: Radar-Sonar Signal Processing and Gaussian Signals in Noise
Bias-free phase tracking with linear and nonlinear systems
IEEE Transactions on Wireless Communications
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The major focus of this work deals with fast and efficient phase estimation in an additive white Gaussian noise environment, where the received signal is a function of both phase and frequency error (ΔΦ,Δf).The paper proposes a modified version of the Viterbi and Viterbi phase estimator, and compares this modified version with the original.The comparison is performed in terms of two criteria – estimator variance and phase ambiguity resolution. Results suggest that the new estimator has a lower variance than the original technique when a frequency error is present. In addition, when the frequency is perfectly synchronized, the two estimators yield similar performances at moderate to high levels of signal-to-noise ratios. Phase ambiguity resolution by unique word preambles is also investigated. Although the new estimator requires additional processing to resolve ambiguity, its probability of resolution error is shown to be almost the same as for the V & V estimator.