Specifications

Accession number: 20131816284988
Title: Information fields navigation with piece-wise polynomial approximation for
high-performance OFDM in WSNs
Authors: Wei, Wei1 ; Shen, Peiyi2 ; Zhang, Ying3 ; Zhang, Liang2/魏嵬;沈沛意;张颖;张亮
Author affiliation: 1 School of Computer Science and Engineering, Xi'An University of
Technology, Xi'an 710048, China
2 National School of Software, Xidian University, Xi'an 710071, Shaanxi, China
3 School of Electronic and Information Engineering, Xi'An Jiaotong University, Xi'an 710049,
China
Corresponding author: Wei, W. ([e-mail])
Source title: Mathematical Problems in Engineering
Abbreviated source title: Math. Probl. Eng.
Volume: 2013
Issue date: 2013
Publication year: 2013
Article number: 901509
Language: English
ISSN: 1024123X
E-ISSN: 15635147
Document type: Journal article (JA)
Publisher: Hindawi Publishing Corporation, 410 Park Avenue, 15th Floor, 287 pmb, New York,
NY 10022, United States
Abstract: Since Wireless sensor networks (WSNs) are dramatically being arranged in
mission-critical applications,it changes into necessary that we consider application requirements
in Internet of Things. We try to use WSNs to assist information query and navigation within a
practical parking spaces environment. Integrated with high-performance OFDM by piece-wise
polynomial approximation, we present a new method that is based on a diffusion equation and a
position equation to accomplish the navigation process conveniently and efficiently. From the
point of view of theoretical analysis, our jobs hold the lower constraint condition and several
inappropriate navigation can be amended. Information diffusion and potential field are
introduced to reach the goal of accurate navigation and gradient descent method is applied in
the algorithm. Formula derivations and simulations manifest that the method facilitates the
solution of typical sensor network configuration information navigation. Concurrently, we also
treat channel estimation and ICI mitigation for very high mobility OFDM systems, and the
communication is between a BS and mobile target at a terrible scenario. The scheme proposed
here combines the piece-wise polynomial expansion to approximate timevariations of multipath
channels. Two near symbols are applied to estimate the first-and second-order parameters. So as
to improve the estimation accuracy and mitigate the ICI caused by pilot-aided estimation, the
multipath channel parameters were reestimated in timedomain employing the decided OFDM
symbol. Simulation results show that this method would improve system performance in a
complex environment. © 2013 Wei Wei et al.
Number of references: 12
Main heading: Wireless sensor networks
Controlled terms: Estimation - Multipath propagation - Navigation - Orthogonal