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基于麦克斯韦(Maxwell)方程的蒙特卡洛数值模拟,计算出城市建筑物介质粗糙面模型中信号的幅度分布和相位分布,分析信号在空间尺度上诸如快衰落、慢衰落以及距离关系等统计规律.相比理想电导体(PEC)模型,本文提出的介质模型更接近复杂的真实环境,模拟结果更趋近于测量值.另外,研究信号在时间尺度上频率衰落的特征,结合相位分布,更加全面地描述信道的多径特征.城市环境中电磁波的传播特征研究有助于新一代微蜂窝无线系统的规划设计,特别是天线种类和摆放位置的选择.
Based on Monte Carlo numerical simulation of Maxwell equation, the amplitude distribution and phase distribution of signals in urban building rough surface model are calculated, and the statistical laws of signals such as fast fading, slow fading and distance in spatial scale are analyzed. Compared with the ideal electrical conductor (PEC) model, the proposed medium model is closer to the complex real environment and the simulation results are closer to the measured values.In addition, the study of the characteristics of the signal frequency fading on the time scale, combined with the phase distribution, To describe the multipath characteristics of the channel.The study of electromagnetic wave propagation in urban environment is helpful for the planning and design of the new generation of micro-cellular wireless systems, especially the choice of antenna types and placement.