移动通信中基于单片机的信道编码的研究..doc

移动通信中基于单片机的信道编码技术的研究 摘 要 由于通信系统固有噪声和衰落的影响，信号在经过信道的传输到达接收端的时候，不可避免的会出现失真的情况。Turbo码就是一种经过长时间的发展而诞生出的在接近shannon限的低信噪比下具有较低的误码率的一种新型的编码方式。它具有优良的纠错性能，现在已经发展成为3G协议标准中高速数据的信道编码技术。本文主要研究的是移动通信中使用单片机实现信道编码的技术，而Turbo码的优良性能决定了其在移动通信编码方面的重要性，因此本文先介绍了移动通信的发展史，然后着重介绍WCDMA中Turbo编码的实现，最后对实现编码的硬件环境做了简要介绍。本次设计是基于单片机的编码设计，基于成本等方面的考虑，选择了STC公司生产的STC12系列单片机。 关键词：移动通信；Turbo码；信道编码；STC12单片机 Microcontroller-based Mobile Communications Channel Coding Technology Research Abstract Because of the influence of the inherent noise and fading communication system, signal transmission to the receiver after channel, distortion of the inevitable will happen. Turbo code is a kind of development for a long time and produced near shannon limit under low signal-to-noise ratio has a lower bit error rate of a new kind of encoding. It has good performance of error correction, and now has developed into 3G high-speed data channel coding technology in protocol standard. This paper mainly studies the microcontroller is used in mobile communication channel coding technology, excellent properties and Turbo code determines its importance in the field of mobile communication code, so this article first introduces the development of mobile communication, and then focuses on the realization of the Turbo coding in the WCDMA, finally the implementation code made a brief introduction of the hardware environment. This design is based on single chip microcomputer coding design, based on considerations such as cost, choose the on STC STC12 series single chip microcomputer. Key words: mobile communication; Turbo code; Channel coding; STC12 MCU 目 录 引言 1 第一章 绪论 2 1.1 课题背景 2 1.2 信道编码的发展历程 2 1.3 信道编码技术 3 1.3.1 RS编码 3 1.3.2 卷积码 4 1.3.3 Turbo码 4 1.3.4 交织 4 1.3.5 伪随机序列扰码 5 1.4 移动通信的发展 5 第二章WCDMA 7 2.1 WCDMA定义 7 2.2 WCDMA的发展历程 7 2.3 WCDMA与3G 8 第三章Turbo码在WCDMA中的应用 10 3.1 Turbo码简介 10 3.2 Turbo码的发展历程 10 3.3 Turbo码的特点 10 3.4 WCDMA中的信道编码方案 11 3.4.1 WCDMA系统中Turbo码的编码原理与结构 12 3.4.2 WC