非合作通信中OFDM系统的载频偏移盲估计方法

Blind carrier frequency offset estimation for OFDM in non-cooperative communication

针对非合作通信系统中多径信道下正交频分复用系统载波频率偏移估计性能不佳的问题,提出了一种正交频分复用系统载波频率偏移盲估计的新方法.该方法首先提出了基于正交频分复用系统子载波间幅度差值的估计代价函数;然后,推导出了基于相邻子载波间幅值乘积的代价函数;最后,对代价函数进行近似变换,并通过多项式内插方法实现了载波频率偏移的估计.仿真结果表明,在多径信道条件下,该方法不但具有良好的估计性能,而且计算复杂度较低.

In view of the problem of poor carrier frequency offset estimation performance over multipath channels for orthogonal frequency division multiplexing（OFDM）systems in non-cooperative communication,a new blind carrier frequency offset（CFO）estimation method is proposed.Firstly,the cost function based on the difference in amplitude is proposed.Secondly,the terminal cost function is derived by the product of the adjacent subcarrier＇s amplitude.Finally,the CFO estimation based on the polynomial interpolation is realized by the transformation cost function.Simulations show that the proposed CFO estimation method has a better performance and lower computational complexity over the multipath channels.