A Variational Bayes Approach to Decoding in a Phase-Uncertain Digital Receiver
Citation:
A. Das and A. Quinn, A Variational Bayes Approach to Decoding in a Phase-Uncertain Digital Receiver, IET Irish Signals and Systems Conference, Trinity College Dublin, 23-24 June 2011, 2011Download Item:
Abstract:
This paper presents a Bayesian approach to symbol and phase inference in a phase-unsynchronized digital receiver. It primarily extends [Quinn 2011] to the multi-symbol case, using the variational Bayes (VB) approximation to deal with the combinatorial complexity of the phase inference in this case. The work provides a fully Bayesian extension of the EM-based framework underlying current turbo-synchronization methods, since it induces a von Mises prior on the time-invariant phase parmeter. As a result, we achieve tractable iterative algorithms with improved robustness in low SNR regimes, compared to the current EM-based approaches. As a corollary to our analysis we also discover the importance of prior regularization in elegantly tackling the significant problem of phase ambiguity.
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Grant Number
Science Foundation Ireland (SFI)
08/RFP/MTH1710
Author's Homepage:
http://people.tcd.ie/aquinnDescription:
PUBLISHEDTrinity College Dublin
Author: Quinn, Anthony
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IET Irish Signals and Systems ConferenceType of material:
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