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    On diversity orders of distortion outage for coherent multi-access channels


    Wang, Chih-Hong and Leong, Alex S. and Dey, Subhrakanti (2011) On diversity orders of distortion outage for coherent multi-access channels. In: 2011 IEEE International Symposium on Information Theory Proceedings. IEEE, pp. 2851-2855. ISBN 9781457705960

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    Abstract

    In this paper we investigate the distortion outage performance of distributed estimation schemes in wireless sensor networks, where a distortion outage is defined as the event that the estimation error or distortion exceeds a pre-determined threshold. The sensors transmit their observation signals using analog amplify and forward through coherent multi-access channels to the fusion center, which reconstructs a minimum mean squared error (MMSE) estimate of the physical quantity observed. We consider three power allocation schemes - 1) equal power allocation (EPA), 2) short-term optimal power allocation (ST-OPA), and 3) long-term optimal power allocation (LT-OPA). We study their diversity orders of distortion outage in terms of increasing numbers of sensors, and show that under Rayleigh fading EPA and ST-OPA achieve the same diversity order of N logN, where N is the number of sensors. On the other hand, in LT-OPA, we find that for N >; 1 the outage probability can be driven to zero with a finite amount of total power.

    Item Type: Book Section
    Additional Information: Cite as: C. Wang, A. S. Leong and S. Dey, "On diversity orders of distortion outage for coherent multi-access channels," 2011 IEEE International Symposium on Information Theory Proceedings, 2011, pp. 2851-2855, doi: 10.1109/ISIT.2011.6034096.
    Keywords: diversity; orders; distortion outage; multi-access; channels;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Hamilton Institute
    Item ID: 14483
    Identification Number: https://doi.org/10.1109/ISIT.2011.6034096
    Depositing User: Subhrakanti Dey
    Date Deposited: 01 Jun 2021 13:43
    Publisher: IEEE
    Refereed: Yes
    URI:

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