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机械毕业设计

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tx051数字通信系统数据纠检错方法研究,机械毕业设计

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数字通信系统数据纠检错方法研究 专业： 通信工程 学号： 1002569 姓名： 李鑫 指导教师： 林东 中文摘要 在噪声信道上传输数字化数据时 ,收到的数据将不可避免的含有差错 .通常用户提出一个差错率 ,当超出此差错率时 ,接受数据不予使用 .当接受数据不满足所要求的差错率时 ,常常可以采用纠检错编码将差错率减小到 所容许的限度内 ,近年来 ,采用纠错编码解决此类问题日益广泛 .香农曾在他的一篇论文中 ,对编码的效能加以阐明 ,在 1948 年 ,他证明 :如果数据源的速率低于被称为信道容量之值时 ,可采用适当的编码和译码 ,以任意小的差错概率进行通信 . 以后将会看到 ,真正对通信速率加以限制的并不是信道容量 ,而是实现编码方案所花的费用 ,费用的限制使通信速率远低于通信容量 ,近年来在寻求用于各类噪声信道上高效与实用的编码方案方面进行了大量的研究 ,并取得了很大的成就 . 本文讨论的主题是 CRC(循环冗余校验 ),汉明码 ,BCH 码 . CRC(循环冗余校 验 )码又称多项式码 ,它是一种在计算机网络和数字通信中用的最广泛的一种检错码 ,漏检率比奇偶校验码低的多 ,同时实现也较简单 .本文给出了利用单片机编程实现校验过程 . 汉明码是一种线性分组码 ,它是一种能纠一个错误的码 ,BCH 码是一种能够纠正多个随机错误的循环码 ,是目前发现的一类很好的线性纠错码类 ,它的纠错能 力 很 强 ,本 人 就 两 种 码 进 行 MATLAB 仿真 ,对 两 种 码 的 性 能 作 了 比较 . 关键词： CRC,汉明码 ,BCH 码 , ntsERROR CORRECTING AND CHECKING IN DIGITAL COMMUNICATION SYSTEM Abstract When numeral data are transmitted in yawp channel, the data which are received will have error in evitablely, generally consumers call for an error rate, when over-stepping the rate, the date will be rejected, when the data received can not meet con-sumers demand, error-correcting code technology can minish the error rate in faculta-tive limit, in recent years, error-correcting code technology is used widely in the communication system,shannal clarified the efficiency of encoding in one of his dis-course, in 1948,he testified that if the speed of data source is under the capability of channel, you can adopt proper encoding and decoding, so that the error rate will be controlled at random in communiation system. In future, you will see that it is not the channel capability which restrains the speed of communication but the cost of realizing the encoding scheme, the speed of communication is more lower than the channel capability, in recent years a lot of research in seeking the efficient and ptacticable encoding scheme have been done which are used in every kind of yawp channel.in which prodigious success has been taken. The discussional subjects are CRC, hamming code, BCH. The CRC code is also called multinomial code, it is a code which is used most broad in computer network and numeral communication, the leak checking ratio is more lower than odd or even code, the realization is also simpe, the text gives the MCS-51 program which realizes the checkout process. Hamming code is a kind of linearity grouping code, it is a code which can check a false code, BCH code is a cyc code which can check some error code, it is a very good linearity code, it has strong error correc