电讯技术
電訊技術
전신기술
Telecommunication Engineering
2015年
10期
1170-1175
,共6页
信号处理%随机共振%等效时移%载波同步
信號處理%隨機共振%等效時移%載波同步
신호처리%수궤공진%등효시이%재파동보
signal processing%stochastic resonance%equivalent time shifting%carrier synchronization
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.
針對隨機共振應用于單頻載波同步時存在的譟聲能量轉化不徹底、採樣點數量需求高的問題,提齣瞭隨機共振等效時移的載波同步方法. 首先,通過充分利用接收信號的先驗信息,設計樣點等效時移過程,降低瞭載波同步對採樣率的需求;其次,通過設計多級迭代的隨機共振繫統,併設置本地同頻方波信號,提高瞭譟聲的轉化效率;最後,給齣瞭較為完整的時移校準和時延校準的模塊設計.理論分析和倣真結果均錶明該方法能夠有效地實現載波同步,併較現有方法提高約10 d性能.
침대수궤공진응용우단빈재파동보시존재적조성능량전화불철저、채양점수량수구고적문제,제출료수궤공진등효시이적재파동보방법. 수선,통과충분이용접수신호적선험신식,설계양점등효시이과정,강저료재파동보대채양솔적수구;기차,통과설계다급질대적수궤공진계통,병설치본지동빈방파신호,제고료조성적전화효솔;최후,급출료교위완정적시이교준화시연교준적모괴설계.이론분석화방진결과균표명해방법능구유효지실현재파동보,병교현유방법제고약10 d성능.
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 e-quivalent 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.
