一种新的OFDM系统载波频率偏移估计和跟踪方案
A Novel Carrier Frequency Offset Estimation and Tracking Scheme for OFDM
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摘要: 针对载波偏移使OFDM系统出现严重的子载波干扰和性能的下降，该文提出一种OFDM频偏估计和跟踪方案，载频捕获阶段频偏估计采用时域内插入等值导频的方法，载频跟踪阶段不需要导频，而是利用循环前缀来估计频率偏移并进行校正。仿真结果证实，该方案中导频辅助的频率偏移估计和载频跟踪不仅估计范围大，而且估计值准确，频偏校正后系统的性能能达到信道理想估计条件下的误比特率。Abstract: In this paper, a carrier frequency offset estimation and tracking scheme for OFDM is presented. Pilot-Symbol-Aided (PSA) estimation is used to estimate carrier frequency offset in OFDM system, and the carrier frequency tracking applies the cyclic prefix. The simulation results prove the PSA estimation of frequency offset is precise, and the carrier frequency tracking is available.
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