FDD LTE上行系统的频偏估计方案及实现

FDD LTE Uplink System Frequency Offset Correction and Implementation

针对LTE系统对频偏十分敏感这一缺点,根据同一子载波在不同时刻由于频偏的存在导致相位偏转不同的特点,本文详细推导了一种基于导频的小数部分的频偏估计方案。通过仿真验证了此频偏估计方案在瑞利多径衰落信道下能实现较精确的频率跟踪。将此方案经优化移植到DSP平台上,通过测试,验证了在实际系统中同样能对子载波的频偏做出精确的估计,且能满足系统性能需求。

One of shortcoming for the LTE system is very sensitive to the frequency offset.According to the same sub-carrier have different phase of deflection in the different times when frequency offset in the presence.This paper is derived of the frequency offset estimation scheme based on the pilot.The simulation proved that in Rayleigh multipath fading channel,this estimation scheme can achieve a more accurate frequency tracking.Optimized this solution and migrate it to DSP platform,through testing,this program validate that,it can obtain accurate frequency offset estimate in the practical application,and can meet the system performance requirements.