无线自组织通信中基于前导符号的定时同步

传统的基于自相关的和基于互相关的定时同步算法具有相关峰的旁瓣较宽或对载波频率偏移(carrier frequency offset, CFO)敏感的问题,均无法满足无线自组织通信系统对快速准确的定时同步的需求。针对这一问题,提出了一种新的基于改进互相关的定时同步算法,通过将一个长的相关器拆分为两个较短子相关器的乘积,使度量函数的主峰更加尖锐、次峰更低,理论分析了算法的抗频偏性和计算复杂度。对所提算法和传统互相关算法的蒙特卡罗仿真结果表明，在复杂度相当的前提下,所提算法在检测准确率上具有1.1 dB的性能增益,且对频偏的鲁棒性较好。

Timing synchronization for wireless ad hoc communication based on preamble symbol

The traditional auto-correlation-based timing synchronization and the cross-correlation-based timing synchronization have the disadvantage that the sidelobe of the correlation peak is too wide or the timing metric is sensitive to carrier frequency offset (CFO). Neither of them can meet the fast and accurate timing synchronization requirement of wireless ad hoc communication system. To address these issues, this paper proposes a new timing synchronization algorithm based on the improved cross-correlation. By splitting a long correlator into the product of two parallel sub-correlators, the new method makes the main peak sharper and the second peak lower. The sensitivity to CFO and computational complexity are theoretically analyzed. The Monte Carlo simulation results of the proposed and the traditional cross-correlation timing algorithm show that while remaining the complexity level the proposed method has a gain of 1.1 dB in terms of detection accuracy and the CFO robustness is better.