基于相位解模糊的简化对角互相关频偏估计算法  

Simplified Diagonal Cross Correlation Frequency Estimation Algorithm Based on Phase Un-wrapping Method

作　　者：孙锦华[1] 余忠洋[1] 段学敏[1] 

机构地区：[1]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,陕西西安710071

出　　处：《电子学报》2016年第8期1974-1980,共7页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60902039;No.61271175);中央高校基本科研业务费专项资金(No.JB140114;No.K5051201043);国家留学基金委

摘　　要：针对导频符号辅助调制(Pilot-Symbol-Assisted-Modulation,PSAM)的短突发信号载波同步,提出了一种基于相位解模糊的简化对角互相关(Phase Un-Wrapping Simplified Diagonal Cross Correlation,PUW-SDCC)算法.其基本思想是,首先借鉴自相关估计的思想设计出对角互相关(Diagonal Cross Correlation,DCC)算法,然后再利用复信号指数化的近似获得了简化DCC(SDCC)算法,最后将该简化算法应用到基于Monte-Carlo仿真的解相位模糊(PUW)方法中,得到了可适应大频偏的SDCC(PUW-SDCC)算法.仿真表明,与现有的频偏估计算法相比,该算法的归一化估计频偏可以达到符号速率的一半,并具有更高的估计精度和适中的复杂度,更适用于短突发通信.For the pilot-symbol-assisted-modulation （PSAM）short burst carrier synchronization,wepropose a simpli-fied diagonal cross correlation carrier estimation algorithm based on phase un-wrapping method （PUW-SDCC）.First ac-cording to the idea of the autocorrelation estimation,a diagonal cross correlation （DCC）algorithm is designed,and then a simplified DCC algorithm is derived by employing the exponent approximation of a complex signal.Finally,a PUW-SDCC algorithm is obtained by combining several phase un-wrapping （PUW）methods which are based on Monte-Carlo simula-tion.Simulation results show that the proposed algorithm achieves an estimation range at half of the data rate and has both higher accuracy and adequate complexity compared with those available,and more suitable for short burst communication.

关 键 词：导频符号辅助调制 互相关估计 Monte-Carlo仿真 相位解模糊 载波估计 

分 类 号：TN911.23[电子电信—通信与信息系统]