Channel estimation techniques in amplify and forward relay networks

In this work we present efficient channel estimation algorithms for wideband amplify-and-forward (AF) based relay networks which utilize a recently proposed transmission model. It is shown that all channels in the network from the source through the relays to the destination/receiver node can be bli...

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Bibliographic Details
Main Authors: Lalos, A.S., Rontogiannis, A.A., Berberidis, K.
Format: Conference Proceeding
Language:English
Subjects:
Channel estimation
Estimation
Frequency estimation
Frequency response
Relays
Signal to noise ratio
Training
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Description
Summary:In this work we present efficient channel estimation algorithms for wideband amplify-and-forward (AF) based relay networks which utilize a recently proposed transmission model. It is shown that all channels in the network from the source through the relays to the destination/receiver node can be blindly estimated up to a phase ambiguities vector which contains the phases of the direct source to destination channel frequency response. Hence, by employing a small number of pilot symbols, phase ambiguities can be effectively resolved. As verified by computer simulations, the proposed methods exhibit high estimation accuracy even for a short training sequence, and outperform direct training-based channel estimation. A performance study of the proposed schemes in high SNR conditions is also presented and verified through computer simulations.
ISSN:1948-3244
1948-3252
DOI:10.1109/SPAWC.2008.4641647