Table of Contents
International Journal of Vehicular Technology
Volume 2015, Article ID 670482, 10 pages
http://dx.doi.org/10.1155/2015/670482
Research Article

Channel Impulse Response Estimation in IEEE 802.11p via Data Fusion and MMSE Estimator

Department of Information Engineering, University of Padova, Via Gradenigo 6/B, 35131 Padova, Italy

Received 19 December 2014; Revised 4 March 2015; Accepted 4 March 2015

Academic Editor: Martin Reisslein

Copyright © 2015 Giulio Ministeri and Lorenzo Vangelista. 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.

Abstract

Tracking the channel impulse response in systems based on the IEEE 802.11p standard, the most widely accepted standard for the physical layer in vehicular area networks (VANETs), is still an open research topic. In this paper we aim to improve previously proposed channel estimators by utilizing data aided algorithm that includes the channel decoding to enhance the quality of the estimated data. Moreover we propose a novel technique that exploits information provided by external sensors like GPS or speedometer, usually present in vehicles. The algorithm proposed so far has been analyzed in non-line-of-sight link conditions; in this paper we present an analysis of performances in the line-of-sight condition as well. Simulations show that both proposals give considerable improvements in terms of packet error rate and channel estimation error in the highway scenario which is surely the most stressing environment for the channel response tracker.