tailieunhanh - Báo cáo toán học: " Radio wave propagation in curved rectangular tunnels at 5.8 GHz for metro applications, simulations and measurements"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Radio wave propagation in curved rectangular tunnels at GHz for metro applications, simulations and measurements | Masson et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 202 EURASIP Journal on . http content 2011 1 202 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Radio wave propagation in curved rectangular tunnels at GHz for metro applications simulations and measurements 1 1 2 2 1 2 Emilie Masson Yann Cocheril Pierre Combeau Lilian Aveneau Marion Berbineau Rodolphe Vauzelle and Etienne Fayt3 Abstract Nowadays the need for wireless communication systems is increasing in transport domain. These systems have to be operational in every type of environment and particularly tunnels for metro applications. These ones can have rectangular circular or arch-shaped cross section. Furthermore they can be straight or curved. This article presents a new method to model the radio wave propagation in straight tunnels with an arch-shaped cross section and in curved tunnels with a rectangular cross section. The method is based on a Ray Launching technique combining the computation of intersection with curved surfaces an original optimization of paths a reception sphere an IMR technique and a last criterion of paths validity. Results obtained with our method are confronted to results of literature in a straight arch-shaped tunnel. Then comparisons with measurements at GHz are performed in a curved rectangular tunnel. Finally a statistical analysis of fast fading is performed on these results. Keywords metro applications wave propagation ray launching curved tunnels arch-shaped tunnels 1. Introduction Wireless communication systems are key solutions for metro applications to carry at the same time with different priorities data related to control-command and train operation and exploitation. Driverless underground systems are one of the best examples of the use of such wireless radio system deployments based on WLAN standards generally in the or GHz bands New York line 1 in Paris Malaga .