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An Auxiliary Variable-Aided Hybrid Message Passing Approach to Joint Channel Estimation and Decoding for MIMO-OFDM | IEEE Journals & Magazine | IEEE Xplore

An Auxiliary Variable-Aided Hybrid Message Passing Approach to Joint Channel Estimation and Decoding for MIMO-OFDM


Abstract:

This letter deals with message passing receiver design for joint channel estimation and decoding in MIMO-OFDM with unknown noise variance. The conventional factor graph r...Show More

Abstract:

This letter deals with message passing receiver design for joint channel estimation and decoding in MIMO-OFDM with unknown noise variance. The conventional factor graph representation for the system involves observation factors, which are functions of a number of variables in the form of multiplication and summation. In this work, by introducing some auxiliary variables, we further break each of the observation factors into several factors, which enables the use of hybrid mean field (MF), belief propagation (BP), and expectation propagation (EP) message passing to tackle the observation factors. It turns out that our approach is much more efficient than the existing approaches, leading to remarkable performance improvement as shown by simulation results.
Published in: IEEE Signal Processing Letters ( Volume: 24, Issue: 1, January 2017)
Page(s): 12 - 16
Date of Publication: 23 November 2016

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I. Introduction

Recently, the applications of message passing to receiver design have attracted much attention [1]. Belief propagation (BP) [2], [3] is especially efficient for discrete probabilistic or linear Gaussian models, but it induces high complexity in nonlinear models or models involving both continuous and discrete variables. Mean field (MF) [4] is suitable for continuous probabilistic conjugate-exponential models, but it may exhibit poor performance in some scenarios, e.g., when applied to multisignal summation structure [5]. Expectation propagation (EP) [6] can be regarded as an approximation of BP [7], where some beliefs are approximated by distributions in a specific exponential family. By exploiting their virtues while avoiding their drawbacks, BP, EP, and MF have been integrated carefully to design superior receivers with low complexity [5], [8] –[12]. In this work, we consider low-complexity hybrid message passing receiver design to achieve joint channel estimation and decoding for multiuser MIMO-OFDM systems.

References

References is not available for this document.