Preamble-based channel estimation for amplify-and-forward OFDM relay networks

Authors:
Bin Jiang;Haiming Wang;Xiqi Gao;Shi Jin;Kai-Kit Wong
Affiliations:
National Mobile Communications Research Laboratory, Southeast University, Nanjing, China;State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China and Department of Electrical and Electronic Engineering, University College London, London, United Kingdom;Department of Electrical and Electronic Engineering, University College London, London, United Kingdom
Venue:
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Year:
2009

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Abstract

In this paper, we address the preamble-based channel estimation problem for orthogonal frequency-division multiplexing (OFDM) systems using multiple amplify-and-forward (AF) relays. We first establish a linear minimum mean-square-error (LMMSE) channel estimator which directly estimates the overall channels from the source to the destination. Then, based on the assumption that the channel correlations between the relays are unknown at the source terminal, a suboptimal training sequence and precoding matrices in closed form are designed to approach the optimal estimation performance at low-complexity.