Ad Hoc Networks. 8th International Conference, ADHOCNETS 2016, Ottawa, Canada, September 26-27, 2016, Revised Selected Papers

Research Article

Distributed Collaborative Beamforming for Real-World WSN Applications

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  • @INPROCEEDINGS{10.1007/978-3-319-51204-4_26,
        author={Slim Zaidi and Bouthaina Hmidet and Sofi\'{e}ne Affes},
        title={Distributed Collaborative Beamforming for Real-World WSN Applications},
        proceedings={Ad Hoc Networks. 8th International Conference, ADHOCNETS 2016, Ottawa, Canada, September 26-27, 2016, Revised Selected Papers},
        proceedings_a={ADHOCNETS},
        year={2017},
        month={4},
        keywords={Distributed collaborative beamforming (CB DCB) Relaying MIMO Scattering Device/machine-2-device/machine (D2D/M2M) communications Wireless sensor networks (WSN)},
        doi={10.1007/978-3-319-51204-4_26}
    }
    
  • Slim Zaidi
    Bouthaina Hmidet
    Sofiène Affes
    Year: 2017
    Distributed Collaborative Beamforming for Real-World WSN Applications
    ADHOCNETS
    Springer
    DOI: 10.1007/978-3-319-51204-4_26
Slim Zaidi1,*, Bouthaina Hmidet1,*, Sofiène Affes1,*
  • 1: Université du Québec
*Contact email: zaidi@emt.inrs.ca, hmidet@emt.inrs.ca, affes@emt.inrs.ca

Abstract

In this paper, we consider a collaborative beamformer (CB) design that achieves a dual-hop communication from a source to a receiver in highly-scattered environments, through a wireless sensor network (WSN) comprised of independent and autonomous sensor nodes. The weights of the considered CB design at these nodes, derived to maximize the received signal-to-noise ratio (SNR) subject to constraint over the nodes total transmit power, have expressions that inevitably depend on some form of the channel state information (CSI). Only those requiring the local CSI (LCSI) available at their respective nodes lend themselves to a truly distributed implementation. The latter has the colossal advantage of significantly minimizing the huge overhead resulting otherwise from non-local CSI (NLCSI) exchange required between nodes, which becomes prohibitive for large and/or high Doppler. We derive the closed-form expression of the SNR-optimal CB (OCB) and verify that it is a NLCSI-based design. Exploiting, however, the polychromatic (i.e., multi-ray) structure of scattered channels as a superposition of impinging rays or chromatics, we propose a novel LCSI-based distributed CB (DCB) design that requires a minimum overhead cost and, further, performs nearly as well as its NLCSI-based OCB counterpart. Furthermore, we prove that the proposed LCSI-based DCB outperforms two other DCB benchmarks: the monochromatic (i.e., single-ray) DCB and the bichromatic (i.e., two-ray) DCB (B-DCB).