基于滑动加窗DFT实现的时钟恢复算法  

Optimized Implementation of Timing Recovery based on Sliding-Window DFT

作　　者：奚廉承 高磊[1] 陆远[1] 孙垒[1] 

机构地区：[1]上海航天测控通信研究所,上海201109

出　　处：《通信技术》2016年第8期997-1000,共4页Communications Technology

摘　　要：分析O&M估计算法固有的DFT数学形式,结合滑动DFT数字处理算法,推导出一种可以使用滑动处理技术实现算法的新架构。该实现方式有效地提高了数字接收机同步解调运算的实时性,同时提供了优化算法性能的另一种途径——使用频域滑动加窗DFT。为有效验证算法滑动加窗前后的性能优劣,搭建了近似实际应用环境(AD采样率、信噪比)的数字接收模型。蒙特卡罗仿真结果证明,滑动加窗O&M算法在相对较低信噪比下具有更高的跟踪精度。The inherent DFT mathematical form of O＆M algorithm is discussed, and in combination with slide DFT digital processing algorithm, a new method based on slide DFT also derived. This new implementation could effectively improve the real-time performance in digital receiver demodulation operation, and in addition, provide another way to optimize the algorithm： frequency domain slide windowed DFT. In order to verify the performance of these two different methods（window and no-window）,an accurate digital receiver model approximate to actual application environment （AD conversion rate and SNR） is constructed. Monte Carlo simulation results indicate that the O＆M algorithm based on slide windowed DFT has fairly high tacking precision at a relatively low SNR.

关 键 词：时钟恢复 O&M无偏估计 滑动DFT 频域加窗技术 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]