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数字通信系统数据帧同步设计及可靠性研究,获取更多毕业论文/毕业设计,请登录360毕业设计网,,或加qq:604664738量身定做！

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数字通信系统数据帧同步设计及同步可靠性研究专业：通信工程 学号：1002555 姓名：陈煜 指导教师： 林东中文摘要在数字通信过程中,同步系统作为一项关键的技术,起着至关重要的作用在正常的数据传输过程中,只有收发双方之间建立了同步才能准确地传输信息,因此要求同步信息传输的可靠性高于信号传输的可靠性随着信道编解码技术的提高,信道误码率的降低,对帧同步的要求也越来越高因为帧同步作为信道解码的前提条件,在不能识别帧同步码字的情况下,也就找不到帧的起始位置,信道解码是无法进行的,信道编解码系统也就失去了作用本文首先介绍了帧同步技术的基本原理最大似然判决算法是在每一帧前插入一个具有良好自相关性的同步码,如巴克码等,然后接收端在比特流中的各个候选位置与同步码计算相关,将相关值最大的位置判决为同步码的位置根据帧同步技术的原理,本文在分析低压电力线载波通信特点的基础上,通过使用 MATLAB软件仿真数字通信帧同步系统,对现有的电力线载波信道数据帧同步技术中帧同步码长度和码型方案进行分析比较设计出一种电力线载波自动抄表系统的数据帧同步方案本文还在理论研究的基础上对仿真数据结果进行了必要的分析,通过图表对比理论值和实际值的整体变化趋势,得出了具体码字在具体判决门限性能,能够给实际工程带来帮助 关键词：帧同步、电力线载波通信、MATLABDESIGN OF FRAME SYNCHRONIZATIONAND RELIABILITY ONDIGITAL COMMUNICATION SYSTEMAbstractSynchronization system, as a key technique, is particularly important in the process of digital communication .In the normal data transmission, the information is transferred correctly only when the receiver and sender are synchronous, so the reliability of synchronization transfer information must be higher than that of signal transfer information. With the improvement of channel encoding technique and the decrease of channel error-code rate, the need for frame synchronization is higher and higher. Because the frame synchronization is the precondition of the channel decoding, the beginning place of the frame synchronization could not be found and the channel decoding could not be progressed on the condition that the frame synchronization codeword could not be recognized, thus it is meaningless to the channel decoding system.In this paper, the basic theory of frame synchronization technique is explained first. The maximum likelihood (ML) decoding algorithm is to insert a good dependent synchronization code before each transfer frame, such as Barker codes, and then compute the dependent of synchronization code and candidate place o bit stream in the receiving end, finally consider the biggest place as the synchronization code place. Based on the theory of frame synchronization and the characteristic of power line communication, By using MATLAB to simulate the system, and analyzing the result. Devise a system be becoming to power line communication.In this article, the simulation result is analyzed based on the theoretical research. The just codeword and performance of the decision threshold is proposed through the changing trend by contrasting the theoretical value to the true value in