EM based channel estimation in an Amplify-and-Forward relaying network

Cooperative communication offers a way to obtain spatial diversity in a wireless network without increasing hardware demands. The different cooperation protocols proposed in the literature are often studied under the assumption that all channel state information is available at the destination. In a...

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Bibliographic Details
Published in21st Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications pp. 724 - 729
Main Authors Aerts, Nico, Avram, Iancu, Duyck, Dieter, Moeneclaey, Marc
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2010
Subjects
Amplify-and-Forward
Channel estimation
Complexity theory
Convolutional codes
cooperative communication
Decoding
EM algorithm
Estimation
Relays
Viterbi algorithm
Viterbi decoding
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Summary:Cooperative communication offers a way to obtain spatial diversity in a wireless network without increasing hardware demands. The different cooperation protocols proposed in the literature are often studied under the assumption that all channel state information is available at the destination. In a practical scenario, channel estimates need to be derived from the broadcasted signals. In this paper, we study the Amplify-and-Forward protocol and use the expectation-maximization (EM) algorithm to obtain the channel estimates in an iterative way. Our results show that the performance of the system that knows the channels can be approached at the cost of an increased computational complexity. In case a small constellation is used, a low complexity approximation is proposed with a similar performance.
ISBN:9781424480173
1424480175
ISSN:2166-9570
DOI:10.1109/PIMRC.2010.5671627