怀化学院学报
懷化學院學報
부화학원학보
JOURNAL OF HUAIHUA TEACHERS COLLEGE
2014年
11期
44-48
,共5页
DDFS%粗同步%细同步%曼彻斯特解码
DDFS%粗同步%細同步%曼徹斯特解碼
DDFS%조동보%세동보%만철사특해마
DDFS%coarse synchronization%accurate synchronization%Manchester encoding
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 dB 下可以准确的提取时钟和正确解码.
為解決現有曼徹斯特解碼中需要加同步頭、時鐘抖動帶來的相位模糊等問題,提齣一種新型曼徹斯特解碼時鐘提取和解碼電路.該繫統採用 DDFS (直接數字頻率閤成)技術,通過粗同步、細同步分彆進行捕穫(測量碼率)和相位跟蹤(鎖相).倣真和實驗結果錶明,該繫統在信譟比大于2.4 dB 下可以準確的提取時鐘和正確解碼.
위해결현유만철사특해마중수요가동보두、시종두동대래적상위모호등문제,제출일충신형만철사특해마시종제취화해마전로.해계통채용 DDFS (직접수자빈솔합성)기술,통과조동보、세동보분별진행포획(측량마솔)화상위근종(쇄상).방진화실험결과표명,해계통재신조비대우2.4 dB 하가이준학적제취시종화정학해마.
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 dB .