为建立更高效的移动端对端(mobile to mobile)通信系统,针对城市狭窄街道多入多出系统(MIMO,multiple input multiple output)移动传播环境,在经典椭圆模型(EBSBM,ellipse based single bounce model)基础上引入等效散射点概念,提出了改进的多跳散射信道模型.此模型将多跳散射路径通过几何变换等效为单点椭圆散射路径,研究了模型的空时频统计特性,推导出发射角(AOD,angle of departure)、到达角(AOA,angle of arrival)及多普勒频移(Doppler shift)等随机参数的概率密度函数(PDF,probability density function)的解析表达式,并进一步分析天线圆形阵列(uniform circular array)分布下的MIMO信道空间相关性及信道容量.仿真实验与以往模型及数据对比验证了所提出模型的有效性.%To establish scattering models that match realistic street transmission scenarios for more efficient M2M mobile communication systems, existing models mainly focus on single-scattering and double-scattering,while for narrow urban street environment, single-scattering assumption is rather restrictive.To overcome this problem, a modified multi-bounced channel model based on EBSBM was provided, in which the concept of equivalent scattering point is assumed.The mul-ti-bounced propagation paths are considered as an one-bounced ellipse scattering path and characteristics of the model were further analyzed. General formulations of several important parameters such as the probability density function (PDF) of the angle-of-departure(AOD), angle-of-arrival (AOA) and Doppler shift were derived, which were applied to the performance of multiple-input-multiple-output(MIMO)system employing a circular array antenna .Doppler fre-quency distribution was also taken into account.The results show good agreement with the previously models, which va-lidates the rationality of proposed model.
展开▼
