中文摘要：

针对高速移动正交频分复用系统,提出了迭代消除子载波干扰的信干比差分计算方法。该方法把前后两次迭代的子载波干扰进行差分运算,差分运算值的加权作为干扰,每次迭代消除子载波干扰后的信号作为有用信号,实现信干比的计算。误差分析和仿真数据表明：采用这种方法计算信干比可以有效估算出系统信干比,同时算法复杂度较低。

英文摘要：

A differential calculation method of Signal to Interference Ratio（SIR） based on iterative Inter-carrier In- terference（ICI） cancellation is proposed for high-mobility orthogonal frequency division multiplexing（OFDM） sys- tem. This method performs differential calculation of ICI before and after iterations, takes weightings of differential calculation and signal of each ICI iterative cancellation separately as interference and signal, respectively so as to realize the calculation of SIR. Error analysis and simulation results show that this method can effectively estimate SIR and has low-complexity.