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.
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.
出处
《怀化学院学报》
2014年第11期44-48,共5页
Journal of Huaihua University
基金
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"(2013GK3145)
关键词
DDFS
粗同步
细同步
曼彻斯特解码
DDFS
coarse synchronization
accurate synchronization
Manchester encoding
