基于码元相关的S模式询问信号解调算法  

S-mode Interrogation Signal Demodulation Algorithm Based on Symbol Correlation

作　　者：赵峙岳 李洪鑫[1] 王正伟[1] 刘志刚[1] ZHAO Zhiyue;LI Hongxin;WANG Zhengwei;LIU Zhigang(Sichuan Jiuzhou Elctron Group Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]四川九洲电器集团有限责任公司

出　　处：《无线电工程》2019年第12期1063-1067,共5页Radio Engineering

基　　金：国家部委基金资助项目

摘　　要：针对传统S模式询问信号解调中载波恢复过程复杂等问题,利用DPSK调整信号前后码元相位翻转的特征,提出了一种基于码元相关的S模式询问信号解调算法。该算法采用前后码元相关累积求和的方式生成相位反转信号,既实现S模式ASK信号的检测,又实现DPSK位同步和码元的解调。该算法对载波不同步不敏感,具备较优的载波抗频偏性能(最大可抗250 kHz频偏)。为了确认算法的可行性,首先从理论上进行了分析,并经仿真验证。To address the issue of complex carrier recovery process in traditional S-mode interrogation signal demodulation,a symbol-based S-mode interrogation signal demodulation algorithm is proposed utilizing the feature that DPSK adjustment realizes symbol phase reversal before and after signal.The algorithm uses the pre-and post-symbol correlation summation to generate the phase inversion signal,which not only realizes the detection of S-mode ASK signal,but also DPSK bit synchronization and symbol demodulation.The algorithm is not sensitive to carrier synchronization and has superior performance of carrier resistance to frequency offset(maximum resistance to 250 kHz frequency offset).To validate the feasibility of the algorithm,it is first analyzed theoretically and then verified by simulation tests.

关 键 词：S模式 询问 DPSK 解调 载波同步 位同步 

分 类 号：TN919.3[电子电信—通信与信息系统]