Vehicle-to-vehicle communication in the vehicle networking scenario has become one of the key applications of the fifth-generation mobile communication technology. To solve the problem that the knowledge of vehicle-to-vehicle channel in vehicle networking scenario is theoretical and abstract, this paper designs wireless channel teaching simulation experiments based on the MATLAB software platform and FPGA hardware development board, which is convenient for students to intuitively understand the basic principles of vehicle-to-vehicle channel. The proposed experiments adopt the QuaDRiGa channel model framework and the improved channel parameter calculation method, which can reproduce a more realistic Doppler phase and obtain a continuous vehicle-vehicle channel output. By visualizing the transceiver trajectories, scattering cluster distribution and channel statistical characteristics, the simulation experiment can show the channel differences in different motion modes and communication scenarios. Teaching practice shows that students can observe the output of vehicle-vehicle channel statistical characteristics from the Doppler domain and the time-delay domain respectively, which can lay a solid foundation for learning the wireless communication system in the vehicle networking scenario.

A real-time ray-based hardware emulator for Unmanned Aerial Vehicle (UAV) communication channels which suits for the Three-Dimensional (3D) dynamic scenarios and considers the movements of both terminals is developed in this paper. The time-variant channel parameters, i.e., ray delay, ray gain, and ray Doppler frequency are precalculated in the host by using the Ray Tracing (RT) method. Meanwhile, RT simulation dramatically increases the number of valid rays. To address the problem of resource limitation and huge computational burden in the implementation, an efficient ray coefficients generation method based on iteration is proposed and implemented. With the advantages of low cost and high flexibility, a Software Defined Radio (SDR) hardware platform is used to emulate the ray-based UAV channels by utilizing the compact architecture including the Time-Division (TD) scheme and Tapped-Delay Line (TDL) for channel convolution. Finally, hardware measurement results demonstrate that the properties of emulated channel, i.e., Power Delay Profile (PDP) and Doppler Power Spectrum Density (DPSD) consist with the simulated ones, which verifies the correctness of hardware implementation. The proposed channel emulator provides an efficient way for optimization, verification, and evaluation of UAV communication systems.