Delay-Amplify-and-Forward Beamforming for Single-Carrier Relay Networks with Frequency Selective Channels


IEICE TRANSACTIONS on Communications   Vol.E100-B    No.11    pp.2079-2086
Publication Date: 2017/11/01
Publicized: 2017/05/19
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016EBP3391
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
amplify-and-forward,  distributed beamforming,  relay networks,  inter-symbol interference,  equalization,  

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In this paper, we propose a relaying strategy for single-carrier relay networks with frequency selective channels, where each relay node delays its received signal before amplify-and-forward processing it. We propose a computationally efficient delay design method which reduces the number of delay candidates. To further reduce computational complexity, we develop a simplified delay design method which reduces the number of weight computations. Also, we extend the design method to the case where only partial channel state information of relay-to-destination channels is available. Simulation results show that the proposed relaying strategy outperforms a conventional amplify-and-forward relaying strategy and achieves the performance close to that of a more complex filter-and-forward relaying strategy. It is also shown that the proposed delay design method achieves near-optimum performance.