Open AccessDistributed estimation scheme based on cooperative communication in wireless sensor networks
Author(s) -
Peng Renming,
Han Yu,
Gao Qiang
Publication year - 2014
Publication title -
iet wireless sensor systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.433
H-Index - 27
eISSN - 2043-6394
pISSN - 2043-6386
DOI - 10.1049/iet-wss.2014.0046
Subject(s) - scheme (mathematics) , wireless sensor network , computer science , estimation , computer network , wireless , key distribution in wireless sensor networks , distributed computing , wireless network , telecommunications , engineering , mathematics , systems engineering , mathematical analysis
In the distributed estimation of an unknown source in wireless sensor networks, the observations are transmitted through fading channels. Thus channel fading influences the estimation distortion significantly. Recently, cooperative communication has been proposed to combat channel fading by providing multiple independently fading paths. In this letter, the authors use cooperative communication to decrease estimation distortion. First, they propose a distributed estimation scheme with amplify‐and‐forward cooperation strategy. To minimise distortion, the optimal power allocation of the individual node transmission power is studied, in which the maximum number of active sensor nodes is limited so as to restrict slot overhead. The optimal solution and a sub‐optimal solution with less computation overhead are given. Numerical results show that, the proposed scheme could achieve a lower estimation distortion even in the case of using fewer slots, when compared with the conventional estimation scheme with non‐cooperative transmission. They also show that our scheme could achieve full estimation diversity.