OFDM系统非平稳相关散射突变信道的表示与估计

Representation and Estimation of Non-stationary Correlated Scattering Mutation Channels in OFDM Systems

高速铁路的建设在我国迅速发展,而高速给列车的控制通信系统和乘客的无线宽带数据接入业务所带来的通信问题日趋显著。因此,对高速铁路环境下的多普勒频移、信道快衰落和突变影响下的信道建模和估计成为了业界的研究热点。给出了高速铁路环境中的信道建模,并通过对比一些常用的信道估计方法,推导得到了广义平稳非相关散射信道和非广义平稳相关散射信道模型。在此基础上,推导了OFDM系统下的等效信道矩阵的表达方式。在实验仿真部分,基于Non-WSSUS的信道模型,在OFDM系统中,探索了在不同时速、天线配置、插值方法和调制方式,对系统性能的影响。

The construction of high-speed railways develops rapidly in China, and the communication problem caused by high-speed train control communication system and passengers' wireless broadband data access service becomes increasingly prominent, and therefore, the modeling and estimation of channels under the influence of Doppler shift, channel fast fading and mutation in high-speed railway environment becomes a research hotspot in the industry. The channel modeling in high-speed railway environment is given. By comparing some commonly-used channel estimation methods, the generalized stationary uncorrelated scatter channel and the non-generalized stationary correlation scatter channel model are derived. And based on this, the expression of equivalent channel matrix under OFDM system is derived. In the experimental simulation,based on the channel model of Non-WSSUS, the effects of different speeds, antenna configurations, interpolation methods and modulation methods on system performance are explored in OFDM systems.