Abstract
IEEE 802.11p is one of the most promising future wireless standards due to the increasing demand of vehicular communication applications. At the time of writing, the document of the standard is in draft and much research is still required to study and improve the performance of transceivers in common vehicular scenarios. In this paper, we present a framework to evaluate the PHY layer of IEEE 802.11p systems in realistic situations. We detail the design and implementation of an FPGA-based real-time vehicular channel emulator. Contrarily to commercial emulators, ours is cheap, very flexible, and reconfigurable. We show its capabilities by evaluating performance in different high-speed scenarios. We also study the importance of coding and the benefits of using IEEE 802.11p instead of IEEE 802.11a in vehicular environments. Towards this aim, we developed a reference IEEE 802.11p PHY transceiver software model that can be taken as a convenient starting point for transceiver design.
Highlights
Wireless communications between moving vehicles (VehicleTo-Vehicle, TV or V2V) and from vehicles to infrastructure (V2I or Roadside-to-Vehicle, RTV) have recently received a lot of attention due to the increasing demand for solutions to tackle critical issues such as vehicular safety and to provide services like traveling information, payment automation or infotainment
To evaluate the performance of our software implementation of the IEEE 802.11p PHY layer described in Section 4, we have passed the signal from the transmitter through the FPGA-based vehicular channel emulator
We have presented a flexible, reconfigurable, and costeffective solution for evaluating IEEE 802.11p transceivers through the real-time emulation of vehicular wireless channels
Summary
Wireless communications between moving vehicles (VehicleTo-Vehicle, TV or V2V) and from vehicles to infrastructure (V2I or Roadside-to-Vehicle, RTV) have recently received a lot of attention due to the increasing demand for solutions to tackle critical issues such as vehicular safety and to provide services like traveling information, payment automation or infotainment Related to these services, a huge amount of vehicular applications has been proposed: collision prevention, accident warnings, hazardous vehicles monitoring, traffic jams avoidance, road works alerts, route recommendation, weather forecast, toll collection, payment in parking facilities and gas stations, mobile internet access at vehicular high speeds, tourist information, and so forth. Commercial channel emulators are usually very expensive and may not offer enough flexibility when configuring the wireless channel parameters Motivated by these observations, we decided to build a cheap and flexible alternative to evaluate the performance of an IEEE 802.11p system in vehicular environments: we implemented a software transceiver and designed an emulator that can be reconfigured fast and providing enough flexibility to implement customized wireless channel models.
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