IEEE 802.11p is a robust and mature technology for dedicated short-range communication (DSRC) where several field trials have been carried out, and the performance of various vehicle-to-everything (V2X) communication scenarios has been investigated. On the other hand, other IEEE 802.11 or wireless local area network (WLAN) standards have evolved and offered some techniques to improve the 802.11p standard. The new task group IEEE 802.11bd (TGbd) was formed to explore the future roadmap for V2X and is working toward a new standard called next-generation V2X (NGV). This article investigates the performance of physical (PHY) layer amendments to 802.11p, i.e., the use of low-density parity-check (LDPC) and midambles, multi-input multi-output-space time block coding (MIMO-STBC), dual-carrier modulation (DCM), and extended-range mode. We build and simulate our system in several V2V channel environments, using the packet error rate (PER) and throughput as the performance metrics. Our investigations show a significant PER performance improvement of all techniques compared to the legacy 802.11p standard. In terms of throughput, the new PHY layer enhancements also give a better performance, except for the DCM technique that improves the reliability of the V2V communication in low SNR conditions at the expense of reducing the channel capacity in half.

IEEE 802.11p 是一种强大且成熟的专用短程通信 (DSRC) 技术，已经进行了多次现场试验，并研究了各种车对万物 (V2X) 通信场景的性能。另一方面，其他 IEEE 802.11 或无线局域网 (WLAN) 标准已经发展并提供了一些技术来改进 802.11p 标准。新任务组 IEEE 802.11bd (TGbd) 的成立是为了探索 V2X 的未来路线图，并正在努力制定称为下一代 V2X (NGV) 的新标准。本文研究了对 802.11p 的物理 (PHY) 层修正的性能，即使用低密度奇偶校验 (LDPC) 和 midambles、多输入多输出空时块编码 (MIMO-STBC)、双载波调制 (DCM) 和扩展范围模式。我们在多个 V2V 通道环境中构建和模拟我们的系统，使用数据包错误率 (PER) 和吞吐量作为性能指标。我们的调查显示，与传统 802.11p 标准相比，所有技术的 PER 性能都有显着提高。在吞吐量方面，新的 PHY 层增强也提供了更好的性能，除了 DCM 技术以将信道容量减少一半为代价提高低 SNR 条件下 V2V 通信的可靠性。