NGB-W系统中最大多普勒频移估计及其改进算法

Estimation of Doppler Frequency Shift in NGB-W System and Its Improved Algorithm

针对传统最大多普勒频移估计算法在低速移动或每帧中传输OFDM符号数较少时估计误差较大的问题,本文针对NGB-W系统提出了一种基于插值的传统多普勒频移估计算法的改进算法。本文依据传统算法,对连续导频进行插值,有效提高了多普勒频移估计算法的性能。采用CCSS平台进行仿真,仿真结果表明,改进的算法与传统算法相比,在低速移动及传输OFDM符号少时表现出更好的性能。

In the traditional maximum Doppler shift estimation algorithm,the estimation error is large when the number of OFDM symbols is low in each frame or at low speed. An improved Doppler frequency shift estimation algorithm based on interpolation is proposed for NGB-W systems. This paper uses traditional algorithms to interpolate continuous pilots,which improves the performance of Doppler frequency shift estimation algorithm effectively. Simulation results using CCSS platform shows that the improved algorithm performs better when compared with the traditional algorithm at low speed or the number of OFDM symbols is low in each frame.