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Title: A pilot-data based channel estimation method for OFDM relay-assisted systems
Author: Neves, D.
Ribeiro, C.
Silva, A.
Gameiro, A.
Keywords: Pilot-data based estimator
OFDM systems
Cooperative schemes and equalise-and-forward protocol
Issue Date: 2011
Publisher: IEEE
Abstract: In this work we propose and evaluate a pilot and data-based channel estimation scheme for SFBC OFDM-based cooperative scenario. We consider that both the base station and the relay node are equipped with double antenna arrays whereas the user terminal is a single antenna device. The relay protocol considered is equalise-andforward. In this paper we propose a channel estimation method that iteratively uses the information carried by the pilots and data to improve the estimate of the equivalent channels for the path Base Station – Relay Node – User Terminal. The MMSE criterion is used in the design of the estimator for both the pilot-based and data-aided iterations. The proposed method is evaluated in terms of the channel estimation MSE and the results show that the proposed scheme allows, with a single data iteration, a reduction of the number of pilots by a factor of approximately two when compared with non-data-aided schemes.
Peer review: yes
DOI: 10.1109/VETECF.2011.6093154
ISBN: 978-1-4244-8328-0
ISSN: 1090-3038
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