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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。
Based on the sensitivity to frequency offset of orthogonal frequency division multiplexing (OFDM) system, this paper introduces and analyzes a fast sampling and precise tracking technique in OFDM receiver. Based on the Kalman filtering algorithm and its fast convergence speed, this technique studies the influence of carrier frequency and estimator on the receiver error rate by changing the design parameters of the OFDM system and receiver. Through research will get an optimal frequency offset estimation. The method has good application, fast convergence, frequency offset in very short signal interval and good tracking ability.