DUPLO Workshop on Full-Duplex Radios and Systems

Research Article

Power control and beamformer design for the optimization of full-duplex MIMO relays in a dual-hop MISO link

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  • @INPROCEEDINGS{10.4108/icst.crowncom.2014.255673,
        author={Umut Ugurlu and Taneli Riihonen and Risto Wichman and Cassio Ribeiro and Carl Wijting},
        title={Power control and beamformer design for the optimization of full-duplex MIMO relays in a dual-hop MISO link},
        proceedings={DUPLO Workshop on Full-Duplex Radios and Systems},
        publisher={IEEE},
        proceedings_a={DUPLO WORKSHOP},
        year={2014},
        month={7},
        keywords={full-duplex mimo miso relay},
        doi={10.4108/icst.crowncom.2014.255673}
    }
    
  • Umut Ugurlu
    Taneli Riihonen
    Risto Wichman
    Cassio Ribeiro
    Carl Wijting
    Year: 2014
    Power control and beamformer design for the optimization of full-duplex MIMO relays in a dual-hop MISO link
    DUPLO WORKSHOP
    ICST
    DOI: 10.4108/icst.crowncom.2014.255673
Umut Ugurlu1, Taneli Riihonen1,*, Risto Wichman1, Cassio Ribeiro2, Carl Wijting2
  • 1: Aalto University
  • 2: Nokia Research Center
*Contact email: taneli.riihonen@aalto.fi

Abstract

This paper studies the optimization of a dual-hop multi-input single-output (MISO) link with a full-duplex multi-input multi-output (MIMO) relay connecting the end nodes based on the amplify-and-forward or decode-and-forward protocol. The direct end-to-end link is considered weak, hence interpreted as interference by the dual-hop relay link. We observe a duality between the first and second hops in terms of transmit powers, and show that one of them always optimally converges to its upper bound. In addition, we combine the minimum mean square error-based receive beamformer with the optimal transmit powers as an iterative approach is not guaranteed to converge to global optimum. Moreover, we introduce a new figure of merit to approximate the optimal transmit beamformers, which is based on the maximization of the signal-to-leakage-plus-noise ratio, and present an iterative algorithm to jointly optimize the receive and transmit beamformers as well as the transmit powers. The numerical results demonstrate that the joint iterative algorithm can achieve higher data rates with the leakage-based transmit beamformers than those with conventional transmit filtering.