一种全数字GMSK解调方法  

A full digital GMSK demodulation method

作　　者：张宗攀[1] 秦玉峰[1] 王宏卓[1] 何兵哲[1] 

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2011年第2期50-53,共4页Space Electronic Technology

摘　　要：文章提出一种用于GMSK解调的全数字中频接收机方案,并重点讨论了载波同步和位同步两个部分。载波同步选用了判决反馈环,可实现特定BT范围内的载波恢复。又根据GMSK信号线性近似后与OQPSK形式一致这一特点,借鉴OQPSK位同步中用到的数据转换跟踪环(DTTL),设计了适用于GMSK的位同步环路。仿真和硬件实现结果均表明该方案是一种简单而又行之有效的方法。This paper presents a method of full digital intermediate frequency receive for GMSK demodulation, and discusses carrier synchronization and bit synchronizalion as an important aspect. Carrier synchronization, selecting and using decision feedback loop, can realize carrier return of particular range of BT. Then according to the formal consistency between linear approximation GMSK signal and OQPSK signal, using the DTTL which is used in bit synchronization of OQPSK for reference, the bit synchronization applicable to, GMSK is designed. Both simulation and implementation results of hard- ware indicate that this method is simple and effective.

关 键 词：GMSK 线性近似 判决反馈环 数据转换跟踪环 

分 类 号：TN92[电子电信—通信与信息系统]