论文部分内容阅读
一、概述循环码校验CRC又称循环冗余码校验,能对随机错码和突发错码以较低的冗余度进行严格检查。由于循环码的码效高,具有良好的抗干扰性能,在计算机网络通信中应用很广。例如,在同步数据链路控制规程(SDLC)和高级数据链路控制规程(HDLC)中,均使用了循环码检错。BITBUS也不例外。循环码检错的原理是:在传送信息码元序列的同时,以一定的规则产生一些冗余码元,使原来不相关的码元序列具有某种相关性。当信息码元发送完毕时,紧接着将这些冗余码元传送出去,在接收端用检查冗余码元与信息码元之间的相关性是否符合原来规定的规则来判断数据传输正确与否。
First, an overview of cyclic code check CRC, also known as cyclic redundancy check, random error code and burst error code with a lower redundancy for rigorous examination. As the cyclic code code efficiency, with good anti-jamming performance, widely used in computer network communications. For example, cyclic code error detection is used in both the synchronous data link control procedure (SDLC) and the advanced data link control procedure (HDLC). BITBUS is no exception. The principle of cyclic code error detection is that while transmitting the information symbol sequence, some redundant symbols are generated by a certain rule, so that the original unrelated symbol sequence has some correlation. When the information symbols are transmitted, the redundant symbols are transmitted immediately, and the receiver determines whether the data transmission is correct or not by checking whether the correlation between the redundant symbols and the information symbols meets the original rules .