移动通信宏小区信道模型的信道估计研究

为了有效地削弱无线通信环境中的多径效应并提高信道参数估计的准确性,在散射体非均匀分布下,引入了到达路径物理概念,提出了一种合理的改进型信道模型。此模型能够准确地描述出宏小区环境下的重要空时参数,如波达信号在基站(Base Station,BS)处的到达角(Angle of Arrival,AOA)和到达路径(Range of Arrival,ROA)。同时,由于移动台的移动特性,基站接收信号产生多普勒频移,从而推导出基站处多普勒频移概率分布。将此模型的数值仿真结果与其他信道模型仿真结果进行比较,结果表明参数估计结果符合理论和经验,证明了提出的信道模型更适用于宏小区移动通信环境,延伸了统计信道模型的研究与应用,为仿真无线通信系统提供了有力的工具。

Research on Channel Esitimation of Scattering Channel Models in Mobile Communication Macrocell Environments

In order to effectively weaken the multipath effect and improve the accuracy of channel parameter estination in wireless communication,a new channel model which is more adapted to different cell types was presented and a new concept of range of arrival was introduced,under the condition of the non-uniform distribution of the scatterer.This model can describe the important parameters in marcocell environments precisely,such as angle of arrival and range of arrival at the base station.In addition, the received signals of the base station has Doppler shift effect due to the mobility feature of mobile station,and the probability distribution of Doppler shift is derived.The numerical simulation results of the model compared with multipath fading channel models in other literatures show that channel parameter estimation results of the model accord with the theory and experience,which expands the research and application of statistical channel model and provides powerful tools for the simulation of wireless communication system.