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Active safety broadcast is one of the most fundamental services in intelligent transportation systems. The repetition code proposed in Wireless Access for Vehicular Environment (WAVE) standard is inefficient in realistic channel conditions and rapidly changing network topologies. In this paper, the authors propose the use of systematic raptor codes as a Forward Error Correction (FEC) scheme at the MAC layer. This code is optimised for short packet lengths, as are expected in safety applications. They have developed a multi-layered simulator that consists of realistic IEEE 802.11p physical layer results, an analytical random access MAC model and FEC codes implemented at different OSI layers.
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