LTE-M系统隧道场景性能仿真评估

Performance Evaluation of LTE-M System in Tunnel Scenario

LTE-M(LTE-Machine to Machine)系统性能与电波传播和无线信道密切相关。分析LTE-M系统在隧道漏缆场景信道特性,介绍3GPP单径莱斯和多径信道模型;开发LTE-M系统链路仿真系统,对不同信道模型、信噪比、移动速度、莱斯K因子下的系统性能,包括吞吐量、丢包率和误比特率,进行仿真评估。根据仿真结果,给出LTE-M网络规划与优化建议,包括信噪比优化目标设定为15 dB左右,在列车高速移动时采用多普勒频偏校正技术,并应该尽可能使漏缆与接收天线之间存在视距路径(LoS)。

The performance of an LTE-M(Long-term Evolution-Metro)system is closely related to the radio propagation and wireless channel.In this report,the channel characteristic in a tunnel with a leaky cable is discussed.In addition,the 3 GPP(Third Generation Partnership Project)single path Ricean channel model and multipath models are introduced.Moreover,a link simulation system for an LTE-M system is developed and the performance of this system,including throughput,block error rate,and bit error rate with various channel models,signal-to-noise ratio,velocity,and Ricean K-factor are emulated.Based on the simulation results,several suggestions are proposed for network planning and optimization,including the setting of the SNR(Signal-Noise Ratio)optimization target of 15 dB,the application of the correction of the Doppler frequency shift at high speed,and the establishment of line of sight(LOS)between the leaky cable and receiver.