MURAL - Maynooth University Research Archive Library



    Distortion Outage Minimization and Diversity Order Analysis for Coherent Multi-Access


    Wang, Chih-Hong and Leong, Alex S. and Dey, Subhrakanti (2011) Distortion Outage Minimization and Diversity Order Analysis for Coherent Multi-Access. IEEE Transactions on Signal Processing, 59 (12). pp. 6144-6159. ISSN 1053-587X

    [img]
    Preview
    Download (415kB) | Preview


    Share your research

    Twitter Facebook LinkedIn GooglePlus Email more...



    Add this article to your Mendeley library


    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 the analog amplify and forward scheme 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), where we minimize the distortion subject to a power constraint at each time step, and 3) long-term optimal power allocation (LT-OPA), where we minimize the distortion outage probability subject to a long-term average power constraint. 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. This suggests that in the case of a large number of sensors, the spatial diversity gain in EPA can overcome fading equally well as in ST-OPA. 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: Article
    Keywords: Distortion; Outage; Minimization; Diversity; Analysis; Coherent Multi-Access;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 12713
    Identification Number: https://doi.org/10.1109/TSP.2011.2165950
    Depositing User: Subhrakanti Dey
    Date Deposited: 07 Apr 2020 09:05
    Journal or Publication Title: IEEE Transactions on Signal Processing
    Publisher: Institute of Electrical and Electronics Engineers
    Refereed: Yes
    URI:
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

    Repository Staff Only(login required)

    View Item Item control page

    Downloads

    Downloads per month over past year

    Origin of downloads