5th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications

Research Article

On the spectral efficiency of MIMO two-way multihop networks with co-existing flows

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  • @INPROCEEDINGS{10.4108/ICST.CROWNCOM2010.9198,
        author={Rindranirina Ramamonjison and Jonghyun Lee and Kei Sakaguchi and Kiyomichi Araki},
        title={On the spectral efficiency of MIMO two-way multihop networks with co-existing flows},
        proceedings={5th International ICST Conference on Cognitive Radio Oriented Wireless Networks and Communications},
        publisher={IEEE},
        proceedings_a={CROWNCOM},
        year={2010},
        month={9},
        keywords={Interference MIMO Network topology Resource management Routing Spread spectrum communication Topology},
        doi={10.4108/ICST.CROWNCOM2010.9198}
    }
    
  • Rindranirina Ramamonjison
    Jonghyun Lee
    Kei Sakaguchi
    Kiyomichi Araki
    Year: 2010
    On the spectral efficiency of MIMO two-way multihop networks with co-existing flows
    CROWNCOM
    IEEE
    DOI: 10.4108/ICST.CROWNCOM2010.9198
Rindranirina Ramamonjison1,*, Jonghyun Lee1,*, Kei Sakaguchi1,*, Kiyomichi Araki1,*
  • 1: Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8552 Japan
*Contact email: rindra@mobile.ee.titech.ac.jp, hyun@mobile.ee.titech.ac.jp, sakaguchi@mobile.ee.titech.ac.jp, araki@mobile.ee.titech.ac.jp

Abstract

In this paper, we investigate the spectral efficiency of MIMO two-way multihop networks when multiple flows co-exist and share the same channel. We assume that each multihop flow mitigates only its own intra-flow interference. More precisely, spatial array processing cancels adjacent node interference and a jointly optimal routing and power allocation strategy mitigates the weaker interference from far nodes. By assuming two types of topology, we study the effect of the inter-flow interference on the end-to-end capacity when the density of flows increases. For the linear topology, we show that multihop routing significantly improved the overall spectral efficiency in dense multihop networks; while single hop MIMO performed better at high SNR regime when there is no interfering flow nearby. However, the network was vulnerable to inter-flow interference in the parallel topology. Consequently, distributed admission control and resource allocation schemes, with coordination among the flows, will be of interest to further improve the spectral efficiency of the multihop networks.