Research Of Doppler Shift Estimation In TD-LTE Under High-Speed Environment

In recent years, with the rapid development of wireless communication technology, intelligent terminal and mobile and mobile device hardware technology innovation,mobile Internet technology come into being, and gradually infiltrated into every aspect of people’s daily life,therefore the application demand of high data rate transmission in various moving speeds are also increased.Though the TD-LTE makes high speed data transmission under high speed railway available,the Doppler frequency shift of high speed is inevitable The maximum Doppler frequency is an important parameter to reflect the channel fading rate which can use as the adaptive channel estimation’s step, it also can be used in interleaving technique,handoff decision and resource allocation.The performance of the whole communication system. So this article focuses on an accurate algorithm of the Maximum Doppler frequency estimation under high-speed environment.In this paper, the classical Maximum Doppler frequency estimation algorithm in recent years are summarized firstly.And it puts emphasis on the analysis of LCR algorithm, COV algorithm, AFC algorithm, The algorithm performance and algorithm deviation are compared through the simulation.A algorithm which can be used in TD-LTE system is choosed, that is based on the cyclic prefix autocorrelation.The complexity of this algorithm is low, and the range of estimation is wide.Then the advice about selection of the parameters which effects on the accuracy of the algorithm is given through the simulation results.Finally,a two polynomial curve fitting algorithm for error correction is proposed, and the correction polynomial with the correction factor is carried out.The simulation results shows this algorithm has a better performance compared with other improved algorithm.