【摘要】 本文从 GMSK调制解调原理出发 ,分析了 GMSK信号的特征 ,依据数字同步器原理 ,提出了实用的比特跟踪同步和积分判决算法 ,并依照逐次逼近 A/ D转换器的原理 ,通过外部锯齿波发生电路 ,配合单片机内部的比较器和相关程序完成了输入信号的 A/ D转换 ,用单片机实现了 GMSK软件解调。本方案成功用于 GMSK股票信息接收终端中 ,实现了数据速率为 9.6 kbit/ s的 GMSK信号解调 ,取得了良好效果。更多还原

【Abstract】 Basing on the theory of digital synchronizer, we analyze the character of GMSK signals in this paper, and design a practical and easily realized arithmetic of bit synchronization and integral detection. Basing on the theory of successive approximation A/D converter, with the external sawtooth wave generating circuit and the comparator in the SingleChip, We accomplished A/D convert by program. In the end, we realized GMSK software demodulation by SingleChip, which is used in GMSM stock information receiving terminal and succeeded in demodulating GMSK signals at 9.6 kbit/s.更多还原