Improving the Channel Utilization of Basic Safety Message in VANETs with Superposition Coded Modulation
Abstract: In this paper, we
propose a broadcast scheme to effectively utilize the scarce and shared
wireless medium for vehicular ad-hoc networks (VANETs). By using superposition
coded modulation (SCM), information elements that comprise basic safety
messages (BSMs) were delivered with different service qualities determined by
real-time traffic situations. The optimal power allocation strategy and
achievable performance gain of the proposed method were first theoretically
analyzed. To apply the proposed method into practice, the hierarchical
quadrature amplitude modulation technology was then employed to implement the
proposed SCM-based broadcast scheme for VANETs. To evaluate the performance of
the proposed method in real-time traffic environments, a joint
traffic-communication simulation was further conducted. Results agree that the
proposed method extends the coverage of the BSM broadcast while maintaining an
acceptable communication reliability to meet the requirement of driving safety.
Keywords: Vehicular ad hoc
networks, Superimposed coded modulation, Hierarchical quadrature amplitude
modulation
Author: Xiang Li
Journal Code: jptkomputergg160165
