一种LTE系统中自适应时频同步方法

An Adaptive Scheme for Time and Frequency Synchronization in LTE Systems

OFDM技术作为LTE系统的核心技术,在LTE系统的下行链路中使用。能够满足LTE频谱灵活性的要求,可以实现高的峰值速率。但是OFDM系统对频率偏移非常敏感,频率偏移会引起载波间干扰(ICI),导致OFDM系统的性能大幅下降。因此本文提出了一种针对LTE系统的自适应时频同步方法。该方法利用自适应技术,实现对频偏的跟踪。仿真结果表明,该方法可以有效的实现时频同步。

As a key Technology, OFDM is used in LTE system for the downlink to meet the LTE requirement for spectrum flexibility and high peak rates. But OFDM is very sensitive to frequency offset. This frequency offset results in inter-cartier interference （ICI） and, as a result, the performance of the OFDM system significantly decrease. In this paper, a adaptive method for time and frequency synchronization in LTE systems is proposed. Adaptive technique is used to track the carrier frequency offset. The simulated results show that the time and frequency can be estimated effectively.