Literature Database Entry


Muhammad Nabeel, "Reliable Communication in Distributed Sensor Networks," PhD Thesis, Department of Computer Science, Paderborn University (UPB), April 2019. (Advisor: Falko Dressler; Referees: Falko Dressler and Robert Weigel)


Sensor networks have gained considerable attention in the past due to their self-organized operation. In this PhD thesis, we target those heterogeneous sensor networks in which backbone (or ground) nodes establish a core network to deliver data to a sink, whereas mobile nodes transmit both localization and encounter information to this backbone network. In the case of errors, the transmitted information is lost and thus needs to be retransmitted. Considering extremely energy-constrained nodes (having weight of less than 2 g), such retransmissions are quite expensive. Hence, we focus on improving the energy-efficiency and communication reliability in such ultra-low power sensor networks. We begin this thesis by investigating the potential of using a square sub-carrier modulation alongside Binary Phase-Shift Keying (BPSK) to transmit localization and data information simultaneously at a single carrier. To assess the performance in both simulations and practical experiments, we develop the whole system in a Software Defined Radio (SDR)-based platform. Our results show that the sub-carrier modulation performs only marginally worse than the BPSK, however, using both of them together saves energy at the mobile node. We then turn our attention towards improved communication reliability. For that, we exploit the distributed nature of the ground network and use it as a distributed antenna array to apply diversity combining. In order to employ receive diversity efficiently, we propose the concept of selective sample forwarding. We build upon our SDR-based implementation and experimentally show that the proposed approach improves the Packet Delivery Rate (PDR) by more than 10 % in comparison to not using diversity combining at all. Finally, we address the cost of forwarding the received information through the ground network to a central sink, where diversity combining is applied. We explore a tree-based algorithm that realizes diversity combining early in the network at local ground nodes rather than at the sink. Our results demonstrate that the proposed algorithm outperforms the näive centralized solution in terms of energy-consumption, channel utilization, and data rate required in the ground network.

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Muhammad Nabeel

BibTeX reference

    author = {Nabeel, Muhammad},
    doi = {10.17619/UNIPB/1-676},
    title = {{Reliable Communication in Distributed Sensor Networks}},
    advisor = {Dressler, Falko},
    institution = {Department of Computer Science},
    location = {Paderborn, Germany},
    month = {4},
    referee = {Dressler, Falko and Weigel, Robert},
    school = {Paderborn University (UPB)},
    type = {PhD Thesis},
    year = {2019},

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