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Symbol synchronization in digital communication systems using partial response CPM signaling

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1 Author(s)
Glisic, S.G. ; Inst. of Electr. Eng., VTI-Beograd, Yugoslavia

The applicability of standard symbol synchronization schemes in digital communication systems using partial-response CPM (continuous phase modulation) signaling has been analyzed. Using the theory of maximum a posteriori estimation of the unknown parameter in Gaussian noise, a theoretical structure for the optimum symbol synchronizer in a system using partial-response CPM signaling is derived. As the first approximation, a closed-loop configuration, known as the early-late loop, is derived and discussed. Due to signal correlation in adjacent symbol time intervals, even this configuration is impractical for a hardware realization. For these reasons, different approximations of the general maximum-likelihood function, leading to the discrete bit timing loop realizations, are derived and discussed. The influence of the carrier phase synchronization error on these synchronizers is also discussed

Published in:

Communications, IEEE Transactions on  (Volume:37 ,  Issue: 3 )

Date of Publication:

Mar 1989

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