估计OFDM整数频偏的新方法

A Novel Scheme for Integer Frequency Offset Estimation in OFDM

针对正交频分复用(OFDM)系统中的整数频偏问题,提出一种新的估计方法.该方法将1个等分的OFDM训练符号下采样为大量长度为点的OFDM子符号,然后结合小数频偏估计值,设计新的快速傅里叶变换(FFT)算法解调一部分OFDM下采样符号,再合并结果,寻找频域峰值,从而对整数频偏做出估计.仿真结果表明,所提出方法具有计算复杂度及估计错误率较低的优点.

A novel scheme for integer frequency offset estimation in OFDM systems was proposed which is based on a training symbol with L identical parts. After down-sampling the training symbol into several L-point sub-symbols and demodulating part of them by means of a new FFT algorithm considering the factor of the fractional frequency offset, the scheme estimates the integer frequency offset by finding the maximum magnitude of the combined resulting frequency domain signals. The computer simulations show that the proposed method exhibits good performance, while maintaining a relatively low complexity.