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Channel Estimation of Dual-Hop MIMO Relay Systems via Parallel Factor Analysis

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Authors
Rong, Yue
Khandaker, Muhammad
Xiang, Y.
Date
2012
Type
Journal Article

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Rong, Yue and Khandaker, Muhammad and Xiang, Yong. 2012. Channel Estimation of Dual-Hop MIMO Relay Systems via Parallel Factor Analysis. IEEE Transactions on Wireless Communications. 11 (6): pp. 2224-2233.
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IEEE Transactions on Wireless Communications
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Copyright © 2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

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Abstract

The optimal source precoding matrix and relay amplifying matrix have been developed in recent works on multipleinput multiple-output (MIMO) relay communication systems assuming that the instantaneous channel state information (CSI) is available. However, in practical relay communication systems, the instantaneous CSI is unknown, and therefore, has to be estimated at the destination node. In this paper, we develop a novel channel estimation algorithm for two-hop MIMO relay systems using the parallel factor (PARAFAC) analysis. The proposed algorithm provides the destination node with full knowledge of all channel matrices involved in the communication. Compared with existingapproaches, the proposed algorithm requires less number of training data blocks, yields smaller channel estimation error, and is applicable for both one-way and two-way MIMO relay systems with single or multiple relay nodes. Numerical examples demonstrate the effectiveness of the PARAFAC-based channel estimation algorithm.