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Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 901509, 9 pages
Research Article

Information Fields Navigation with Piece-Wise Polynomial Approximation for High-Performance OFDM in WSNs

1School of Computer Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
2National School of Software, Xidian University, Xi'an 710071, Shaanxi, China
3School of Electronic and Information Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Received 23 September 2012; Revised 11 December 2012; Accepted 12 December 2012

Academic Editor: Zheng-Guang Wu

Copyright © 2013 Wei Wei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.