几乎所有的数字通信系统都需要建立稳定可靠的接收位同步。常用的锁相同步方式能满足大部分数字通信系统的需要,已获得广泛的应用。但是,通信系统中的大量携带式数字通信机要求更简单可靠的同步方式。众所周知,最简单的自同步方式是直接滤波法。由于采用分立元件制做的滤波器直接从信号序列中提取的定时信息是不稳定、不可 Almost all digital communication systems need to establish a stable and reliable receive bit synchronization. The commonly used lock-in synchronization method can meet the needs of most digital communication systems and has been widely used. However, a large number of portable digital communicators in communication systems require simpler and more reliable synchronization. As we all know, the simplest way of self-synchronization is direct filtering. As the use of discrete components made filter directly from the signal sequence to extract the timing information is not stable, not