三维非平稳V2V信道建模及统计特性研究

Three-Dimensional Non-Stationary V2V Channel Modeling and Its Statistical Properties

针对车-车(Vehicle-to-Vehicle,V2V)通信场景复杂多样且无线信号呈现三维传播的特点,提出了一种双簇散射体架构的三维非平稳随机几何信道模型(Geometry-Based Stochastic Model,GBSM)。该模型考虑了直射路径、单跳路径、多跳路径和虚拟等效链路,可适用于车联网通信环境各种信号传播场景。在此基础上,针对该模型理论推导了三维场景下信道的统计特性,包括归一化空时相关性、多普勒功率谱(DPSD)、电平通过率(LCR)和平均衰落持续时间(AFD)的理论表达式。仿真结果表明,推导的理论结果和数值仿真及实测结果都比较吻合,从而验证了理论推导的正确性及信道模型的有效性。该模型可用于车联网通信场景下无线通信系统的方案设计和性能分析。

Due to the complication and 3D propagation of vehicle-to-vehicle(V2V) communication, a 3D non-stationary geometry-based statistical model based on twin-cluster scattering structure is proposed in this paper. Line-of-sight(LoS), single-bounced, multiple-bounced, and equivalent virtual link are taken into account, which can guarantee the general usefulness for all signal propagation ways of V2V communication. Meanwhile, statistical properties of this model, including normalized time-variant spatial-temporal correlation properties, Doppler power spectrum density(DPSD), level-crossing rate(LCR), and average fading duration(AFD) are investigated and analyzed. Simulation results demonstrate that theoretical results, simulated ones, and measured ones are in an excellent agreement, which verifies the correctness of statistical properties’ investigation and usefulness of model. Our model can be used in design and optimization of V2V communication systems.