基于CP和导频的两级OFDM频偏估计方法

Two-stage OFDM Frequency Offset Estimation Method Based on CP and Pilot Frequency

在OFDM通信系统中,频偏估计技术是一项关键技术,OFDM系统对于载波偏移比单载波系统更加敏感。目前,常用的频偏估计技术要么存在较大残余频偏,要么会增加传输冗余,降低传输效率,无法满足高速传输系统的需求。基于循环前缀和导频的估算频偏提出了一种新型频偏估计方法,并通过仿真验证了该频偏估计方法的有效性。将该方法与单一频偏估计方法进行对比分析,结果表明,该方法不会降低传输效率,且具有良好的频偏估计性能,适用于高速传输OFDM通信系统。

Frequency offset estimation is a key technology in OFDM communication system.OFDM system is more sensitive to carrier offset than single carrier system.At present,commonly used frequency offset estimation technology either has a large residual frequency offset or increase the transmission redundancy and thus reduce the transmission efficiency,which cannot meet the needs of high-speed transmission system.Based on the estimated frequency offset of CP and pilot frequency,this paper proposes a novel frequency offset estimation method and verifies the effectiveness of this frequency offset estimation method by simulation.The method is compared and analyzed with a single frequency offset estimation method,and the results indicate that the method does not reduce the transmission efficiency and has good frequency offset estimation performance,which can be applied to high-speed transmission OFDM communication systems.