考虑快衰落的Geometry建模

Method for Geometry Modeling Considering Fast Fading

通过累加各时域可分辨径接收功率的方法(方法一),以及计算一段时间内各个子载波的平均SINR的方法(方法二),给出考虑快衰落的两种新的Geometry建模方法。针对LTE系统级仿真,分别在ITU信道模型和3GPP信道模型下对SISO和采用MRC接收机的SIMO进行下行链路仿真,采用新方法获得考虑快衰落的Geometry,并且和传统Geometry计算方法进行对比,证明三种Geometry基本都可以表征SISO下的用户平均后处理SINR,但是传统的Geometry并不能完全表征多天线模式下的后处理SINR,而提出的方法二相比方法一和传统的Geometry计算方法能更精确的表征系统性能的好坏。

Through the method of accumulating the power of time domain distinguishable path in the channel model and averaging the SINR for every subcarrier in a period of warm-up slot, two new modeling methods for geometry was developed. With an LTE system level simulator, downlink simulation for SISO and SIMO with MRC receiver was preceded respectively in ITU channel model and 3GPP channel model. With the two new methods, geometry considering the impact of fast fading was compared with traditional geometry considering only large scale fading. Results show that the 3 methods of geometry modeling can basically charaeterize the user average post SINR in SISO. However, traditional geometry modeling can＇t entirely characterize the user average post SINR in multiple antenna modes. The proposed frequency domain averaging method has its＂ advantage over the traditional geometry modeling method and time domain power accumulation method as it precisely characterizes the performance of the system.