Saturday, July 28, 2012

Wi-Fi Standards -802.1p


802.11p / DSRC / WAVE

In July 2010, IEEE published the IEEE 802.11p™- 2010 standard.

The standard defines mechanisms that allow IEEE 802.11™ technology to be used in high speed radio environments typical of cars and trucks. In these environments, the 802.11p enhancements to the previous standards enable robust and reliable car-to-car and car-to-curb communications by addressing challenges such as extreme Doppler shifts, rapidly changing multipath conditions, and the need to quickly establish a link and exchange data in very short times (less than 100 ms). Further enhancements are defined to support other higher layer protocols that are designed for the vehicular environment, such as the set of IEEE 1609™ standards for Wireless Access in Vehicular Environments (WAVE).
802.11p supports Intelligent Transportation Systems (ITS) applications such as cooperative safety, traffic and accident control, intersection collision avoidance, and emergency warning. 802.11p will be used for Dedicated Short Range Communications (DSRC), a U.S. Department of Transportation project as well as the name of the 5.9 GHz frequency band allocated for the ITS communications. More information on the 802.11p standard can be obtained from the IEEE.

Testing Wireless Devices for Vehicular Communications

802.11p operates in the 5.835-5.925 GHz range, divided into 7 channels of 10 MHz each. For testing of 802.11p devices, LitePoint has developed an ad-hoc operating mode in its current WiFi (IQview/IQflex) and Multi-Radio (IQ2010) test platforms.
The LitePoint IQview/IQflex and IQ2010 test platforms contain a Vector Signal Analyzer (VSA) and Vector Signal Generator (VSG) offering full transmit and receive test capabilities for 802.11p devices, in addition to other wireless connectivity standards.
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