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    Space-Time Spreading Aided Distributed MIMO-WSNs


    Dey, Indrakshi and Joshi, Hemdutt and Marchetti, Nicola (2021) Space-Time Spreading Aided Distributed MIMO-WSNs. IEEE Communications Letters, 25 (4). pp. 1338-1342. ISSN 1089-7798

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    Abstract

    In this letter, we consider the plaguing, yet rarely handled problem of interference resulting from superposition of multiple sensor signals in time, when sent over a multiple access channel (MAC) in wireless sensor networks (WSNs). We propose space-time spreading (STS) of local sensor decisions before reporting them over a MAC to i) minimize interference and ii) reduce energy required for combating interference due to superposition of sensor decisions. Each sensor decision is encoded on appropriately indexed space-time block of fixed duration using dispersion vectors, such that a single sensor is activated over each space-time block while all the other sensors are silent. At the receive side of the reporting channel, we assume a multi-antenna decision fusion center (DFC), thereby representing a distributed multiple-input-multiple-output (MIMO) communication scenario. We formulate and compare optimum and sub-optimum fusion rules for fusing sensor decisions at the DFC to arrive at a reliable conclusion. Simulation results demonstrate gain in fusion performance with STS-aided transmission by 3 to 6 times over performance without STS.

    Item Type: Article
    Additional Information: Cite as: I. Dey, H. Joshi and N. Marchetti, "Space-Time Spreading Aided Distributed MIMO-WSNs," in IEEE Communications Letters, vol. 25, no. 4, pp. 1338-1342, April 2021, doi: 10.1109/LCOMM.2020.3046231.
    Keywords: Wireless sensor networks; Interference; MIMO communication; Fading channels; Shadow mapping; Dispersion; Complexity theory;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Item ID: 15986
    Identification Number: https://doi.org/10.1109/LCOMM.2020.3046231
    Depositing User: Dr Indrakshi Dey
    Date Deposited: 24 May 2022 11:00
    Journal or Publication Title: IEEE Communications Letters
    Publisher: IEEE Explore
    Refereed: Yes
    URI:

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