一种高速移动场景中的频偏校正方法

A Frequency Shift Correction Method in High Speed Vehicle Conditions

研究高速通信中干扰问题。频偏估计和补偿是移动通信中一个重要的研究内容。在WCDMA无线接入网中,为了抑制高速移动中较大的多普勒频偏所带来的解调性能恶化,保证高速移动场景中的网络覆盖质量,基站接收机必需能够实时地对接收数据的频偏进行跟踪校正。分析了高速移动场景下多普勒频移对WCDMA系统物理层带来的影响,提出了WCD-MA系统物理层的频偏校正方法,针对高铁场景专网覆盖方案,采用了一种改进的估计校正方法。仿真结果表明校正方法对基带解调性能有明显提升,能够满足实际工程应用的要求。

Frequency offset estimation and compensation in a mobile communication system are a key research direction.In the WCDMA radio access network,in order to restrain the deterioration of the demodulation performance from large Doppler frequency shift in high speed vehicle conditions,ensuring network coverage quality,the base station receiver must be able to perform frequency offset estimation and compensation for received data in real time.This paper presents the basic principles of the Doppler frequency shift and the impact of it on the performance of the WCDMA physical layer.A modified frequency shift correction method suitable for high speed vehicle conditions is proposed after analyzing the anti-frequency-offset technology in WCDMA physical layer.The simulation results show that the demodulation performance of baseband receiver is improved significantly after the new method is put into practice.