一种基于Kalman滤波的OFDM系统频偏估计方法

文章基于正交频分复用（OFDM）系统对频偏的敏感性特点，介绍和分析了在OFDM接收机中的一种快速采样和精确跟踪技术。这种技术基于Kalman滤波算法和它快速的收敛速度，通过改变OFDM系统和接收端的设计参数来研究载波频率及估计器在接收端错误率中的影响。通过研究将得到一个最佳的频率偏移估计。该方法应用良好，有快速收敛能力，能在极短信号间歇中获取频偏，并拥有良好的跟踪能力。

Frequency Offset Estimation of OFDM System Based on Kalman Filtering

Based on the sensitivity of orthogonal frequency division multiplexing （OFDM） system to frequency offset, this paper presents and analyzes a technique for fast sampling and accurate tracking in OFDM receivers. The scheme is based on Kalman filtering algorithm and its fast convergencey speed. Since OFDM＇ s extremely sensitive to carrier frequency errors, the impact of the carrier frequency estimator on the receiver error rate is investigated by changingdesign parameter of OFDM system and receiver. With these investigations an optimal estimation of frequency offset is achieved. The method performs well, is with fast convergence so that it can acquire the frequency offset within several symbol intervals, and also with good tracking capability.