双散射信道条件下六边形多载波调制系统的定时同步算法  

Timing Synchronization for Hexagonal Multicarrier Modulation over Doubly Dispersive Channels

作　　者：许魁[1] 沈越泓[1] 陈寿齐[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《电子学报》2009年第3期546-551,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60772083)

摘　　要：在双散射信道条件下,以时频平面上任一点处期望信号能量与脉冲间干扰能量以及加性噪声能量的信干噪比为目标函数,将目标函数取最大值的时刻作为六边形多载波调制系统的最优定时时刻,推导出最优定时时刻的迭代算法,得出信道平均时延可以作为近似最优定时时刻的结论,并提出一种频域近似最优定时同步算法.理论分析与计算机仿真结果表明,在双散射信道条件下与传统的定时时刻相比,最优定时时刻在信噪比为30dB时能够获得2～3dB的信干噪比增益,提出频域近似最优定时同步算法在存在载波频偏时估计的均方误差小于10-4.This paper proposes the optimal timing by maximizing signal-to-interference-plus-noise ratio （SINR） for hexagonal multicarrier modulation （HMM） over doubly dispersive channels.An iterative optimal timing algorithm is derived and it comes out that there is an allowable error between the mean delay of doubly dispersive channels and the optimal timing. In addition, an approximate optimal timing synchronization method is proposed. The theoretical analysis and computer simulation results show that the proposed optimal timing is outperform the traditional timing method about 2 - 3dB in SINR while signal-to-noise ratio （SNR） is 30dB and the approximate optimal timing algorithm achieves a smaller mean square error （MSE） than 10^-4 over doubly dispersive channels.

关 键 词：六边形多载波调制 最优定时时刻 定时同步算法 双散射信道 

分 类 号：TN919.6[电子电信—通信与信息系统]