摘 要
近年来,随着计算机技术和通信技术的飞速发展,ARQ(自动请求重传)差错控制技术的研究和应用取得了巨大的发展,ARQ差错控制技术应用也越来越广泛。大部分通信应用都需要实时传送数据。在通信过程ARQ传送中,吞吐率和时延是两个主要的性能指标。一般来说,当码字无错接收时,吞吐率是和传送时延是互相矛盾的。当传送时延高时,吞吐效率就会下降,而现在远距离通信已经成了通信系统中必不可少的一部分。所以如何减小传送时延对吞吐效率的影响成了现在研究的一个重要部分。
在论文的绪论部分,就ARQ技术的背景和发展现状做了介绍。第二章介绍了ARQ技术的主要类型及其工作原理,并对三种基本型ARQ进行性能分析。第三章介绍了基于多信道复用的停止等待式等ARQ技术,该技术提高了传输效率，可适用于传输性能较差的通信环境。第四章介绍了一种基于信道噪声估计的ARQ技术。该技术能在很大的程度上减小重传次数，分析了系统的数据通过率、平均传送时间.最后通过仿真实验说明了该技术可以获得较大的数据通过率和较小的平均传送时间,同时提高了系统传输的可靠性。最后,给出了全文内容的总结。大学论文网www.wnwu.com
关键词：差错控制，自动请求重传，吞吐率，多信道， 信道估计
ABSTRACT大学论文网www.wnwu.com
In recent years, with computer technology and the rapid development of communication technology, ARQ (automatic repeat request) error control research and application of technology has made tremendous development, ARQ error control technology has become increasingly widespread. Most communications applications require real-time transmission of data. ARQ transmission in the communication process, the throughput and latency are two major indicators of performance. Generally speaking, when the receiver error-free code word, the throughput and transmission delay are two conflicting ideas. When the transmission delay is high, throughput efficiency will drop, and now long-distance communication has become an indispensable communication systems part. So how to reduce the transmission delay on the throughput efficiency of research now has become an important part.
In the paper the introduction of the technology on the ARQ status of the background and development is introduced. In the second chapter introduces the main types of ARQ technology and its working principle, three basic types of ARQ for performance analysis. Chapter III, introduced the multi-channel based on the stop to wait for reuse, such as ARQ-type technology, which improves transmission efficiency, transmission performance applicable to the poor communications environment. In the fourth chapter is devoted to a channel noise estimate based on the ARQ technology. The technology can reduce a large extent on the number of retransmission, an analysis of the data system through rate, average transmission time. Finally, simulation experiment shows that the technical data available to the larger and smaller average transmission time At the same time, enhance the transmission reliability of the system. Finally, a summary of the contents of the full text.
Keywords: error control, ARQ , throughput efficiency, multi-channel，channel estimation
目 录
第1章 绪论 1
1.1研究背景 1
1.2 ARQ技术的发展历史 2
1.3 本文的主要工作和内容安排 6
1.4小结 6
第2章 ARQ的理论 8
2.1 ARQ的类型及其工作原理 8
2.1.1停止—等待式ARQ 8
2.1.2 后退N帧的ARQ 12
2.1.3选择性重传ARQ 17
2.2 三种ARQ的性能分析 20
2.3 小结大学论文网www.wnwu.com26
第3章 多信道复用停止等待式ARQ技术 28
3.1 引言 28
3.2 多信道停等ARQ系统模型 28
3.2.1 理论分析 29
3.2.2数值分析 32
3.3 小结 36
第4章 基于信道噪声估计的ARQ技术 37
4.1 引言 37
4.2 方法原理 37
4.3 性能分析 40
4.4仿真结果分析 41
结论 43
参考文献 44
致谢 45
