中文摘要：

隧道推动反应(CIR ) 能为直角的频率部门 multiplexing (OFDM ) 在时间域根据周期的关联被估计系统。这篇文章建议一个概括隧道评价方法由拿不同 CIR 的一般水准减少评价错误。隧道推动回答根据周期的关联的不同起点被导出。另外，一个有效 CIR 长度评价算法也被介绍。全部与更长周期的前缀建议方法对 OFDM 系统更有效，特别到那些。分析和模拟结果在一样的条件下面比常规计划更好证实均方差表演是 45 dB。

英文摘要：

Channel impulse response （CIR） can be estimated on the basis of cyclic correlation in time-domain for orthogonal frequency division multiplexing （OFDM） systems, This article proposes a generalized channel estimation method to reduce the estimation error by taking the average of different CIRs. Channel impulse responses are derived according to the different starting points of cyclic correlation. In addition, an effective CIR length estimation algorithm is also presented. The whole proposed methods are more effective to OFDM systems, especialiy to those with longer cyclic prefix. The analysis and the simulation results verify that the mean square error performance is 4-5 dB better than the conventional schemes under the same conditions.