等效时移随机共振的载波同步

针对随机共振应用于单频载波同步时存在的噪声能量转化不彻底、采样点数量需求高的问题，提出了随机共振等效时移的载波同步方法。首先，通过充分利用接收信号的先验信息，设计样点等效时移过程，降低了载波同步对采样率的需求；其次，通过设计多级迭代的随机共振系统，并设置本地同频方波信号，提高了噪声的转化效率；最后，给出了较为完整的时移校准和时延校准的模块设计。理论分析和仿真结果均表明该方法能够有效地实现载波同步，并较现有方法提高约10 d性能。

Equivalent time shifting stochastic resonance for carrier synchronization

When the stochastic resonance is applied to the synchronization of single frequency carrier,the noise power conversion is not thorough and the sampling rate is reduced.To solve above problems,an equivalent time shifting method is presented. Firstly,by utilizing the prior information of receiving signal,an equivalent time shifting process is designed to reduce the sampling rate demand for carrier synchronization.Secondly,by designing multi-stage iterative stochastic resonance system and setting up a local square wave signal,the conversion efficiency of the noise-to-signal is improved.Finally,the time shifting module and the time delay module are presented. Theoretical analysis and simulation results show that this method can effectively achieve carrier synchronization,and has about 10 dB extra gain compared with existing methods.