5G低轨卫星移动通信系统多普勒频偏估计算法

A Doppler Shift Estimation Schemefor 5G-LEO Satellite Mobile Communication System

摘要:

随着卫星移动通信系统近些年来的快速发展,高传输速率、广泛覆盖范围、较低的传输时延以及较强灵活性是新一代的5G低轨(LEO)卫星移动通信系统发展的要求,但是由于低轨卫星移动速度很快,产生的较大的多普勒频移。通过建立使用5G候选波形滤波的正交频分复用技术(F-OFDM)的新型低轨卫星移动通信系统,针对该新型系统设计一种新的多普勒频偏估计方法,首先借助卫星轨道的多普勒特性来计算整数多普勒频偏,第二步借助F-OFDM资源块中的导频信息来估计精确的多普勒频移。主要完成了5G低轨卫星移动通信系统模型的建立与算法在系统中的仿真来验证其实际性能,经过仿真可以得到,本算法与同类算法相比计算复杂度低且精度较高。

Abstract:

With the rapid development of satellite mobile communication systems in recent years, high transmission rate, wide coverage, low transmission delay and strong flexibility are the requirements for the development of the new generation of 5G LEO satellite mobile communication systems. However, due to the high speed of the low orbit satellites, the larger Doppler shift is generated. By establishing a new low orbit satellite mobile communication system using 5G candidate waveform filtering orthogonal frequency division multiplexing (F-OFDM), a new Doppler frequency offset estimation method is designed for the new system. First, the Doppler characteristic of satellite orbit is used to calculate the integer Doppler frequency offset, and the second step is using the pilots information in the F-OFDM resource block to estimate the accurate Doppler shift. The pilot information is used to estimate the exact Doppler shift. This paper mainly completes the model of 5G low orbit satellite mobile communication system and the simulation of the algorithm in the system to verify its actual performance. The algorithm performance can be obtained through simulation, compared with the similar algorithm, the algorithm has low complexity and high accuracy.