毕业设计（论文）-数据通信技术精选.doc

陕西理工学院 毕业设计（论文） 学生姓名 学 号 专业班级 指导教师 201年月 摘要 数据通信技术是计算机网络技术发展的基础已经成为现代生活中必不可少的一部分。但通过通信信道传输的数据往往会有差错的产生且不可避免。因此我们必须要进行数据校验。校验的方法有很多，其中CRC校验码是一种重要的循环码，编码和解码方法简单，容易实现，检错能力强，是一种效率极高的数据校验方法。本文意义在于检测数据传输中的错误信息码，其目的是使数据信息码在接收端能够准确的接收，利用CRC校验的编码和解码原理和具体实现步骤，用VHDL语言编程实现，在对程序进行仿真时，在发送端发送信息时，将校验码R(X)加到信息码C(X)之后一同发出。并将这时发出的信息称为X)码，T(X)正好能被G(X)整除。接收方收到信息码为T’(X)。如果传输中未发生错误，则接收码T’(X)与发送码T(X)相同，故能被G(X)整除；如果传输中发生错误，则接收码T’(X)与发送码T(X)不相同，且不能被G(X)整除。因此，我们就以T’(X)除以G(X)的余数是否为0来判断接收码元中是否有错误。也有可能收到的错误码元除以G(X)余数为0，这种问题是CRC所不能解决的，只能通过选择G(X)和增加冗余位来降低这种错误的概率。基于EDA技术的现场可编程门阵列FPGA集成度高，结构灵活，采用FPGA较好地实现了仿真，并对数据作了一定的处理，本设计中为CRC校验。另外可以利用FPGA的在线可编程特性，对本设计电路进行功能扩展，以满足更高的要求。 关键字：CRC检验；编码原理；解码原理；VHDL Abstract Data communication technology is the foundation for the development of the computer network technology, has become an indispensable part of modern life. But through the communication channel transmission of data often can have the mistake produce, and inevitable. So we have to have some data validation. Calibration method are many, including CRC check code is a kind of important circulation yards, encoding and decoding method is simple and easy to implement, fault ability, detection is a highly efficient data calibration method. This paper significance lies in the error detection data transmission of information yards, the purpose is to data information code can accurately on the receiving end of receiving, use the CRC check encoding and decoding principle and specific implementation steps, with VHDL language programming realization, convenient readers understand and use. In the procedure simulation, after the sender sends the information, will check code R(X) added to the information code C(X) issued together after. And the message will then called T(X) yards, T(X) just can be G(X) division. The receiving party received information code for T (X). If the transmission errors, then not receiving yards T (X) and send yards T (X) same as can be G(X)