Cooperative Intelligent Transport Systems: 5.9-GHz Field Trials

摘要: The mobile outdoor radio environment is challenging for vehicular communications. Although multipath propagation offers diversity and benefits in non-line-of-sight (NLOS) conditions, simultaneous mobility results a doubly-selective fading channel. In practice, this means that the channel parameters vary significantly both time frequency within bandwidth typical packet durations used 802.11p/WAVE standards short-range This paper presents of extensive field trial campaigns conducted several countries, totaling over 1100 km. These trials are scenario based, focusing on low-latency, high-reliability vehicle-to-vehicle (V2V) safety applications including intersection collision warning, turn across path, emergency electronic brake light, do not pass precrash sensing. Vehicle-to-infrastructure (V2I) also considered. compared performance off-the-shelf WiFi-based equipment with more advanced 802.11p compliant employing sophisticated estimation tracking. Field demonstrate improved using radio, translating into greatly increased driver warning times stopping distances. fact show WiFi fails to provide sufficient distance avert accidents some cases. During trials, sounding data were captured. Analysis these measurements reveals critical importance accurate estimation, tracking each packet. Delay spread Doppler statistics computed from validate previously reported literature. paper, however, first instance performed simultaneously application evaluation. objective firmly establish link between characteristics V2V applications.