礼堂直达与非直达传播环境建模及性能研究

Modeling and performance study of direct and indirect radio propagation environment in auditorium

针对典型的礼堂环境中无线信道的直达与非直达的传播情况,提出一种基于几何散射模型改进的参考模型,假设散射体在传播环境内均匀分布,推导出波达信号到达角的概率密度函数、多普勒功率谱密度以及时间自相关函数的表达式,并分析主要参数对信道模型统计特性的影响。此外,根据参考模型设计出一种高效的SOC信道仿真模型以及两种模型参数化的方法,并以多普勒功率谱密度和时间自相关函数为指标比较两种方法的性能。结果表明,两种信道仿真模型参数化方法均准确高效,且仿真模型中各项统计特性均与对应参考模型中的统计特性能取得较好的匹配。

According to the wireless channel of typical hall environment in the direct and non direct situation, this paper puts forward an improvement of geometric scattering model reference model based on the assumption of scattering propagation environment.The probability density function of angle of arrival, the Doppler power spectrum density and the expression of time autocorrelation function are derived, and the impact of function variables on the statistical properties of the channel model is analyzed. In addition,according to the reference model, this paper designs an efficient SOC simulation model and two kinds of methods to calculate the parameters of channel simulation model, the performance of the two methods is compared with the Doppler power spectral density and time autocorrelation function. The result shows that the two methods for calculating the model parameters are accurate and efficient, and the statistical characteristics of the simulation model can be well matched with the statistical characteristics of the corre-sponding reference model.