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Performance Analysis of Relay Channel Estimation

By Panagiota Lioliou, Mats Viberg and Mikael Coldrey

Abstract

Amplify-and-Forward (AF) relays can be used to enhance the channel in Multiple-Input-Multiple-Output (MIMO) wireless communication systems. However, optimizing the channel requires Channel State Information (CSI). This paper is concerned with the performance of relay channel estimation. A Least Squares (LS) based algorithm for the estimation of all relevant channel parameters was recently proposed by the authors. It is based on creating different compound channels by varying the gain factors at the relays. From this, the individual links from source to relay and from relay to destination, are revealed using LS. To investigate the algorithm performance, the Cram\ue9r-Rao lower Bound (CRB) is computed and compared with the asymptotic covariance of the proposed estimator. Furthermore, we propose and analyze an improved algorithm that is efficient for high Signal-to-Noise Ratio (SNR). Computer simulations demonstrate the performance of the algorithm. The results indicate that the asymptotic expressions are in good agreement with the simulations

Topics: Electrical Engineering, Electronic Engineering, Information Engineering
Year: 2009
DOI identifier: 10.1109/ACSSC.2009.5470126
OAI identifier: oai:research.chalmers.se:108577
Provided by: Chalmers Research
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