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On the Optimality of the MAP Estimation Loop for Carrier Phase Tracking BPSK and QPSK Signals

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1 Author(s)
M. Simon ; Jet Propulsion Lab., Pasadena, Calif.

Starting with MAP estimation theory as a basis for optimally estimating carrier phase of BPSK and QPSK modulations, it is shown in this paper that the closed loop phase trackers, which are motivated by this approach, are indeed closed loop optimum in the minimum mean-square phase tracking jitter sense. The corresponding squaring loss performance of these so-called MAP estimation loops is compared with that of more practical implementations wherein the hyperbolic tangent nonlinearity is approximated by simpler functions.

Published in:

IEEE Transactions on Communications  (Volume:27 ,  Issue: 1 )