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    National Tsing Hua University Institutional Repository > 研究中心 > 電腦與通訊科技研發中心 > 技術報告 >  Distributed estimation in wireless sensor networks with channel-aware slotted aloha

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/13254

    Title: Distributed estimation in wireless sensor networks with channel-aware slotted aloha
    Authors: Keng-U Lei,
    Yao-Win Hong,
    Chong-Yung Chi
    Date: 2007
    Publisher: Institute of Electrical and Electronics Engineers Inc.
    Keywords: Distributed estimation
    wireless sensor networks
    channel-aware slotted aloha
    Abstract: A cross-layered slotted ALOHA protocol is proposed for distributed estimation in sensor networks. Suppose that the sensors in the network record local measurements of a common event and report the data back to the fusion center through direct transmission links. We employ a channel-aware transmission control where the transmission probability of each sensor depends on the quality of the local observation and the conditions of the transmission channel in each time slot. In contrast to conventional ALOHA systems, our goal is to minimize the accumulated estimation error at each instant in time as opposed to maximizing the system throughput. We show that the transmission probability which achieves the maximum throughput does not provide the best solution to the distributed estimation problem. Two strategies are proposed: the maximum meansquare- error (MSE) reduction (MMR) method and the suboptimal two-mode MSE-reduction method. The first scheme maximizes the reduction in MSE for each transmission but requires the information of the number of active sensors and the accumulated estimation accuracy before each time slot. In the second scheme, the sensors utilize the interchange between two fixed transmission control policies without the explicit knowledge of the system parameters required in the first scheme.
    Relation Link: http://www.ieee.org/portal/site
    URI: http://nthur.lib.nthu.edu.tw/handle/987654321/13254
    Appears in Collections:[電腦與通訊科技研發中心] 技術報告
    [通訊工程研究所] 會議論文
    [積體電路設計技術研發中心] 會議論文

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