Automotive

Download Intelligent Transport Systems: 802.11-based by Syed Faraz Hasan, Nazmul Siddique, Shyam Chakraborty PDF

By Syed Faraz Hasan, Nazmul Siddique, Shyam Chakraborty

Focusing at the nuts and bolts of instant community entry for pcs on board cars, this quantity exhibits how in-car computerization now does even more than purely act as a glorified map-reader. instant conversation is reworking street shuttle in methods formerly undreamt of, permitting automobiles to “talk” to a much broader community and computer screen street stipulations, capability delays and traffic jam, all immediately. Toll funds could be made with no establishing the driver’s window on a chilly day, whereas automobiles could themselves take energetic steps to prevent collisions.

It is the relationship among on-board desktops and instant entry issues, ubiquitous in such a lot towns now, that may be a key sector of analysis. relocating cars move their communications to new issues as they growth, and this reasons delays, often called “handover latency”. during this ebook, new stochastic types are constructed to map the disruption while connecting to 802.11 WLAN issues. It information the applying of stochastic instruments to interpreting verbal exchange networks, in addition to past literature on handover latency and appropriate mathematical modeling. eventually, it provides a scheme for tracking traffic jam utilizing WLAN connectivity. This quantity can be an invaluable addition to the libraries either one of instant conversation scholars and people learning chance theory.

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Extra resources for Intelligent Transport Systems: 802.11-based Roadside-to-Vehicle Communications

Sample text

Several mathematical models have been proposed to estimate the RSS and signal loss, for example the log-distance path loss model (in Eq. 1)) and signal attenuation due to penetration (in Eq. 2)). 2) where, Pro is the signal strength at a distance of 1 m from transmitter, α is the Path Loss Exponent, and X σ represents the Gaussian random variable with zero mean and standard deviation of σ dB (Rappaport 1996). f is the carrier frequency, d is transmitter-to-receiver separation, Nw is the number of walls, and W is the wall loss factor.

11r, HOKEY is specific to EAP authentication mechanism. 11n HT (High Throughput) has been introduced to provide data rates as high as 600 Mbps to the WLAN users. 11n uses Multiple Input Multiple Output (MIMO) along with Orthogonal Frequency Division Multiplexing (OFDM) and a bandwidth of 40 MHz (instead of 20 MHz) in order to offer high data rates (Goth 2008). 11n to increase the throughput of the compliant devices. 11a/b/g stations. 11a/b/g standards use only one antenna. 11n stations are transmitting.

2009) have given two algorithms to detect congestion, in this work, the main concern is to determine whether the WLAN infrastructure can support traffic monitoring applications. The design and implementation of a mobile sensor system has also been covered by Hull et al. (2006) who exploit Bluetooth and WiFi networks. In X-MULE, however, the main focus in on the WLAN infrastructure only. (2009), while a technique to detect traffic congestion has been proposed in P-Atikom et al. (2006). This work focuses on the communication aspects of X-MULE; the techniques to detect congestion have not been discussed here.

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