NDLI: An EM approach for joint channel estimation and channel decoding in systems employing Physical-Layer Network Coding

Content Provider	IEEE Xplore Digital Library
Author	Taotao Wang Liew, S.C.
Copyright Year	2013
Description	Author affiliation: Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Hong Kong, China (Taotao Wang; Liew, S.C.)
Abstract	This paper applies the expectation-maximization (EM) algorithm to address the problem of joint channel estimation and channel decoding in Physical-layer Network Coding (PNC) systems. The use of PNC can significantly improve the throughput of a relay network. The throughput advantage, however, is predicated on the availability of accurate channel estimates. For channel-coded PNC systems, a major challenge is that the maximum a posteriori probability (MAP) channel estimation is nontrivial due to 1) the overlapping of signals from multiple users received at the relay; and 2) the correlations among data symbols introduced by channel coding. In this paper, we show that an EM algorithm implemented on a factor graph framework is well suited to tackle this problem. Through iterative message passing, the channel estimation component and the channel decoding component in the factor graph interact to improve each other's results progressively. Simulation results indicate that just one EM iteration of our algorithm can significantly improve the channel estimation accuracy as well as the BER performance of channel-coded PNC systems.
Starting Page	5104
Ending Page	5108
File Size	228167
Page Count	5
File Format	PDF
ISBN	9781479903566
ISSN	15206149
DOI	10.1109/ICASSP.2013.6638634
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-05-26
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Channel estimation Receivers Decoding Iterative decoding Joints Relays Message passing PNC EM message passing factor graph
Content Type	Text
Resource Type	Article

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