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:	Publisher
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

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