中国铁道科学   2010 年 第5期 期

2010

The non-stationary behavior,caused by the train movement,is the main factor for the variation of high speed railway channel.To measure the time-variant effect,the parameter of stationarity interval,in which the channel keeps constant or has no great change,is adopted based on Zhengzhou-Xi'an(Zhengxi)passenger dedicated line measurement with different train speeds.The stationarity interval is calculated through the definition of Local Region of Stationarity(LRS)under three train velocities.Furthermore,the time non-stationary characteristic of high speed railway channel is compared with five standard Multiple-Input Multiple-Output(MIMO)channel models,i.e.Spatial Channel Model(SCM),extended version of SCM(SCME),Wireless World Initiative New Radio Phase II(WINNERII),International Mobile Telecommunications-Advanced(IMT-Advanced)and WiMAX models which contain the high speed moving scenario.The stationarity interval of real channel is 9 ms in 80% of the cases,which is shorter than those of the standard models.Hence the real channel of high speed railway changes more rapidly.The stationarity intervals of standard models are different due to different modeling methods and scenario definitions.And the compared results are instructive for wireless system design in high speed railway.