[其它]论文答辩陈述.doc

摘 要 数字信号在无线信道传输过程中，不可避免会受到各种干扰和噪声的影响，这种影响将使接收端收到的信号中出现误码。为了使误码率达到一定的指标，从而满足信噪比的要求，这除了在系统设计时采取措施尽量减少干扰外，另一个有效的措施就是提高所传输数字信号本身的抗干扰能力，即对数字信号进行差错控制编码，也称作信道编码。信道编码技术是所有数字移动通信系统为保证通信质量与可靠不可缺少的检错（纠错）措施。其纠错电路根据通信质量的要求具有多种形式，GSM移动通信系统为保证通信质量的可靠在信道编码上采用了多种纠错方法。因此，信道编码的目的是为了提高数字信号的抗误码（抗干扰）能力，使在信道中传输的数字信号本身具有一定的误码判断能力或纠错能力，提高信号传输的可靠性。本文主要介绍信道编码中的线性分组码和卷积码，交织编码，以及GSM移动通信系统所采用的信道编码。 关键词：信道 交织 卷积 编码 纠错 Abstract Digital signal transmission in the wireless channel, the inevitable will be all kinds of interference and noise, this effect will the signal received by the receiver bit error occurs. In order to achieve a certain target bit error rate, to meet the requirements of signal to noise ratio, which in addition to measures taken in system design to minimize interference, another effective measure is to increase the transmission of digital signals its anti-interference ability, i.e. the number signal error control coding, also known as channel coding. Channel coding technology is all digital mobile communication system to ensure quality and reliable communications an integral error detection (correction) measures. The error correction circuit in accordance with various forms of communication quality requirements, GSM mobile communication system to ensure quality and reliable communications channel coding used in a variety of error correction methods. Therefore, channel coding aims to improve the digital signal of anti-error (interference) ability to transmit digital signals in the channel itself has a certain degree of error correction to judge the ability or capacity, to improve the reliability of signal transmission. In this paper, a letter of introduction channel coding of linear block codes and convolution codes, interleaving, as well as GSM communication systems were used by the system, the channel coding. Key words: Channel Interwoven Convolution Coding Correction 目 录 摘要 I Abstract II 绪论 1 1 信道编码的基本概念 2 1.1 信道编码的编码率 2 1.2 移动通信中常用的信道编码的类型 2 2 线性分组码与循环码 4 2.1 线