|
本文论述了基带信号的产生过程及其原理特点。信号源的产生是整个数字信号处理系统的基本部分，它是整个系统的源头，它将为后面系统的信号特性分析、调制样式识别、解调后PCM数据分析，噪声分析等操作提供原始的信号源。为了能够提供有效、可靠的信号源，在本文中数据源我们将采用全0码、全1码、55码、6A码、m伪随机码和任意数据文件这六种基本码，并对其频谱特征进行了分析。然后对其产生的数据源进行NRZ-L、NRZ-M、NRZ-S ，BIФ-L、BIФ-M、BIФ-S六种基本的码型转换，形成基本的基带信号源，最后选择一种帧结构将其所产生的数据源组帧，这样能更有利于信号为后面的系统直接使用。在整个过程中，我们用MATLAB语言编写的程序来对数字基带信号产生这一过程进行仿真分析。 关键字： 基带信号；码型变换； CRC This text has described the generation process with signal of base and principle characteristic .The formulation of the signal source is a basic part of the whole digital signal processing system, It is a source of the whole system，It is in it for in the back of the systematic one signal characteristic analyse, lasted design discerning, PCM data analysis after demodulation, the noise is analysed etc. to operate and offer the primitive signal source, In order to offer the effective , reliable signal source. We source of data , adopt 0 yard the whole , the whole 1 , 55 , 6A yard , m false yard and wanton data file six yard basically these at random in the article in originally, and has analysed to its spectral characteristic . Then not about its carry on NRZ-L , NRZ-M , NRZ-S of data source when produce , BIФ_ L, BIФ_ M , BIФ_S there aren't S basic yards of type of six kinds, form the basic baseband signal source, Choose one frame structure help produced by it datum source group frame systematic directness use later finally. In the whole course, we is it produce with MATLAB procedure that language write to digital baseband signal course this go on emulation analyse to come.. Key word： Signal of the baseband; Yard varying; CRC 目 录 摘要…………………………………………………………………………………………….…1 ABSTRACT……………………………………………………………………………………2 第1章 引言……………………………………………………………………….……………3 1.1 概率……………………………………………………………………………………..…3 1.2 数字基带信号源研究的意义………………………………………………………....3 第2章 基带信号的基本理论…………………………………………………………...4 2.1 基带信号的特点及优缺点…………………………………………………………….4 2.2 传输码的选择……………………………………………………………………………4 第3章 基带信号及频谱特征…………………………………………………………...6 3.1 基带信号中的几种常见的码元…………………………………………………...…6 3.1.1 全0码……………………………………………………………………………...6 3.1.2 全1码……………………………………………………………………………...6 3.1.3 55码………………………………………………………………………………..7 3.1.4 6A码……………………………………………………………………………….7 3.1.5 任意数据文件……………………………………………………………………8 3.1.6 m伪随机码……………………………………………………………………….8 3.2 数字基带信号的频谱特性……………………………………………………………9 3.2.1 单个矩形波形的频谱………….……….………………………………………9 3.2.2 随机脉冲序列的频谱…………………...………………………………………9 第4章 码型转换……………………………………………………………………………13 4.1 单极性不归零（NRZ）码……………………………………………………….…13 4.1.1 NRZ_L……………………………………………………………………………13 4.1.2 NRZ_M…………………………………………………………………………...13 4.1.3 NRZ_S…………………………………………………………………………….13 4.2 双相码……………………………………………………………………………..……14 4.2.1 BIФ_L………………………………………………………………………….…14 4.2.2 BIФ_M……………………………………………………………………………14 4.2.3 BIФ_S……………………………………………………………………………..14 第5章 组帧技术……………………………………………………………………………15 5.1 帧结构……………………………………………………………………………….…15 5.2 循环冗余校验码（CRC）…………………………………………………………15 5.3 CRC校验码的算法分析……………………………………………………………16 第6章 系统实现技术…………………………………………………………………….18 6.1 基带信号的产生流程图…………………………………………………………….18 6.2 代码实现……………………………………………………………………………....19 6.3 总结与展望……………………………………………………………………………24 致谢…………………………………………………………………………………………...…25 参考文献………………………………………………………………………………………26 附录1 文献综述……………………….…………………………………………………..27 附录2 英文原文……………………………………………………………………………30 附录3 英文译文……………………………………………………………………………35 附录4 源代码…………………………………………………………………………….…40 |
数字信号处理－基带信号的产生模块分析与设计（完整一套）
查看评论
已有0位网友发表了看法