Speech Quality Evaluation Based Codec for VoIP Over 802.11P

摘要

Voice over Internet Protocol (VoIP) may provide good services through Vehicular ad hoc networks (VANETs) platform by providing services to many application scenarios range from safety to comfort. However, VANETs networks introduce many challenges for supporting voice with QoS requirements. In this paper, our study is based on Inter-Vehicle voice streaming rely on multi-hop fashion. For this task, a performance evaluation of various audio CODECs will be analyzed by mean of simulations. Furthermore, we test the impact of network environment on QoS metrics. To achieve good results, CODECs behaviour is tested by using mobility information obtained from vehicular traffic generator. The mobility model is based on the real road maps of an urban environment. Focusing on inter-vehicular voice traffic quality, we provide simulations results in terms of both user level (MOS) metrics and network level (such as Losses). According to this performance evaluation, we show that G.723.1 CODEC worked well in the urban VANET environment