| 一种基于DDFS技术的曼彻斯特码时钟提取及解码电路 |
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| 引用本文： | 钱莹晶,张仁民.一种基于DDFS技术的曼彻斯特码时钟提取及解码电路[J].怀化学院学报,2014(11):44-48. |
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| 作者姓名： | 钱莹晶 张仁民 |
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| 作者单位： | 怀化学院 物理与信息工程系,湖南 怀化,418008 |
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| 基金项目： | 怀化学院资助科研项目“交互式职能语音呼叫系统额研究与实现”(HHUY2008-07)；湖南省科技计划研究项目“基于公共移动通信网络的‘多防’远程监控系统” |
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| 摘 要： | 为解决现有曼彻斯特解码中需要加同步头、时钟抖动带来的相位模糊等问题,提出一种新型曼彻斯特解码时钟提取和解码电路.该系统采用DDFS(直接数字频率合成)技术,通过粗同步、细同步分别进行捕获(测量码率)和相位跟踪(锁相).仿真和实验结果表明,该系统在信噪比大于2.4 d B下可以准确的提取时钟和正确解码.
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| 关 键 词： | DDFS 粗同步 细同步 曼彻斯特解码 |
The Manchester Code Clock Extraction and Decoding Circuit Based on DDFS |
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| QIAN Ying-jing,ZHANG Ren-min.The Manchester Code Clock Extraction and Decoding Circuit Based on DDFS[J].Journal of Huaihua University,2014(11):44-48. |
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| Authors: | QIAN Ying-jing ZHANG Ren-min |
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| Institution: | ( Department of Physics and Information Engineering, Huaihua University, Huaihua, Hunan 418008 ) |
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| Abstract: | In order to avoid synchronization header and phase ambiguity due to clock jitter in conditional Manchester decoder,a novel clock extraction and decoding circuit is proposed. Code rate and phase is attained respectively through coarse synchronization and accurate synchronization by using DDFS technology. The simulation and experiment results show that the decoder can extract the clock accurately and decode the data correctly when the SNR is greater than 2. 4 d B. |
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| Keywords: | DDFS coarse synchronization accurate synchronization Manchester encoding |
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