室内带金属家具环境的电波传播特性研究

射线跟踪方法是研究室内复杂环境电波传播特性的有效技术。基于改进的入射及反弹射线法和镜像法研究了室内有金属家具的电波传播特性,仿真结果与已知文献测量结果对比,一致性良好,证明了该方法在室内复杂环境预测电波传播特性的正确性和有效性。仿真结果表明：（1）视距传播（LOS）绕射对接收功率贡献很小,可以忽略;非视距范围内（NLOS）绕射贡献较大,不可忽略,三次反射对整个室内的接收功率影响都很小。（2）金属家具的存在导致了视距范围内接收功率的剧烈波动,非视距范围内的接收功率波动不明显。（3）有金属家具房间的均方根时延变化幅度大。（4）到达角在空房间中近似于均匀分布,加入金属家具后,在视距范围内波动剧烈。（5）受到达角的影响,多普勒频移变化情况与到达角分布一致。分析结果为室内有金属家具环境的无线通信系统设计提供了有效的理论依据。

Study on the Radio Wave Propagation in Indoor Environments with Metallic Furniture

The ray tracing method is a practical approach to study the radio wave propagation in complex indoor environments. An improved Shooting-and-Bouncing Ray / Image（ SBR / Image） method is employed to study the radio wave propagation characteristics. It is agreed well by a comparison of simulated results and measured results,which validates the proposed method. The simulating results indicate that：（ 1） The diffracted ray makes a small contribution to the received power and can be neglected in Line-of-Sight（ LOS）,however,it makes a greater contribution in Non-Line-of-Sight（ NLOS） and can＇t be neglected. The trinal reflection path affects the received power little in whole room area.（ 2） The received power fluctuates faster and stronger in LOS than in NLOS as the existence of metallic furniture.（ 3） The RMS delay spread varies substantially in furnished room.（ 4） The arrival angle approximately follows the uniform distribution in empty room,however,it fluctuates violently in LOS of furnished room.（ 5） The changes of Doppler shift consist with the distribution of arrival angle. The theoretical support can be provided by these results for the system design of wireless communication in indoor environments with metallic furniture.