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数字通信系统由于具有模拟通信系统中不具有的许多优点,如(1)可用编码技术来提高通信的可靠性和保密性;(2)数字信号,便于处理、存贮和交换;(3)采用大量逻辑电路,便于电路集成化和固体化。因此,在国民经济和国防建设的各个领域中得到广泛的应用。从数字通信的基本理论中,我们了解到数字通信系统能否有效地工作,在相当大的程度上依赖于收发两端之间的正确同步。同步不良导致差错检验概率增加,或是使全部接收的信息无法识别,从而使通信间断,甚至完全中断。因此,数字通信中需要解决的一个重要问题就是同步问题。通常位同步(又称码元同步)
Digital communication system has many advantages that analog communication system does not have, such as (1) available coding technology to improve the reliability and confidentiality of communication; (2) digital signal, easy to process, storage and exchange; (3) A large number of logic circuits to facilitate circuit integration and solidification. Therefore, it has been widely used in various fields of national economy and national defense. From the basic theory of digital communications, we know that digital communications systems work effectively, to a large extent, depend on the correct synchronization between transceivers. Poor sync leads to increased probability of error checking, or unrecognized all received information, disrupting or even completely disrupting communications. Therefore, an important issue that needs to be solved in digital communications is the synchronization problem. Usually bit synchronization (also known as symbol synchronization)