多径信道下OFDM系统的采样频率偏移盲估计方法

发布时间：2018-03-29 01:34

本文选题：采样频率偏移　切入点：正交频分复用　出处：《西安电子科技大学学报》2014年04期

【摘要】：为提高实际的非合作通信系统中正交频分复用系统的采样频率偏移估计性能,提出了一种多径衰落环境下、非合作通信系统中、时频同步之前的正交频分复用系统采样偏移估计的新方法.该方法先利用一种改进循环谱对谱相关点进行粗估计,再利用另一种改进的循环谱对谱相关点进行细估计,最后根据估计出的相关点上循环谱的相位值,经跳变转化、最小二乘直线拟合后计算出相位变化率,得到正交频分复用系统采样偏移的估计值.仿真结果表明,该方法在多径信道条件下,比现有的盲估计方法具有更高的估计精度与性能.
[Abstract]:In order to improve the performance of sampling frequency offset estimation of orthogonal frequency division multiplexing (OFDM) systems in practical non-cooperative communication systems, a multi-path fading system for non-cooperative communication systems is proposed. A new method of sampling offset estimation for orthogonal frequency division multiplexing (OFDM) system before time frequency synchronization is proposed. In this method, one kind of improved cyclic spectrum is first used to estimate the spectral correlation points rough, then another improved cyclic spectrum is used to estimate the spectral correlation points. Finally, according to the estimated phase value of the cyclic spectrum on the correlation point, the phase change rate is calculated by least-square straight line fitting after the jump transformation, and the estimated sampling offset of the orthogonal frequency division multiplexing system is obtained. The simulation results show that, The proposed method has higher estimation accuracy and performance than existing blind estimation methods in multipath channels.
【作者单位】：西安电子科技大学综合业务网理论及关键技术国家重点实验室;
【基金】：国家自然科学基金资助项目(61271299) 国家"863"高技术研究发展计划资助项目(2007AA01Z288) 高等学校学科创新引智计划资助项目(B08038)
【分类号】：TN929.53

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