脉冲成形BPSK调制电路的设计与实现

文档编号:TX380  文档字数:11472,页数:36

摘要

 现代通信系统要求通信距离更远、通信容量更大、传输质量更好。作为其关键技术之一的调制解调技术一直是人们研究的一个重要方向。从模拟调制到数字调制，从二进制发展到多进制调制，虽然调制方式多种多样，但都是朝着使通信系统更高速、更可靠的方向发展。一个系统的通信质量，很大程度上依赖于所采用的调制方式。因此，对调制方式的研究，将直接决定着通信系统质量的好坏。
 随着超高速数字集成电路的发展，成形滤波器已经由过去的基带频域模拟成形滤波器变成现在的基带时域数字成形滤波器。与基带模拟成形滤波器相比，基带数字成形滤波器具有高精度、高可靠性和高灵活性等优点;同时还具有便于大规模集成、易于实现线性相位等特点。
 本系统主要解决数字基带信号的成形滤波，信号调制。本文介绍了BPSK QPSK信号调制的实现方法以及信号的移相。重点阐述了采用MC1496来实现信号混频调制的乘法电路，将基带信号调制到中频。
 
关键词： 乘法器，调制器，移相器，分压器，D/A转换，成形滤波器 

ABSTRACT

 In modern communications systems we want communicate distance farther,capacity larger,and transmission quality better.As one of the key technologies , modem technology has been an important direction of our research. Modulation from analog to digital modulation,from binary to M modulation,has various methods, But they are moving to the development of more high-speed ,more reliable communication system. To a large extent,A system of communication quality dependent on the method used by the modulation. Therefore, the modulation of the study, will directly determine the quality of the communication system.
 With the ultra-high-speed digital IC development, Forming filter has been from the previous base-band frequency simulation forming filter into the present-band digital forming filter.Compared with the base analog forming filters,digital base-band forming filter has advantages of high precision and high reliability and high flexibility, And also offers characteristics for large-scale integrated and easy to implement Linear Phase.
 This system is mainly to solve the digital base-band signal forming filter and modulation. In this paper, it is mainly introduce BPSK QPSK signal modulation methods and the realization of the phase-shifting signals. It Focuse on the use of MC1496 to achieve the multiplication circuit,and modulation of base-band signal to the intermediate frequency modulation.

Key Words: Multiplier ,Modulators,Phase Shifter,Divider,D/A converter,Forming filter

目录

摘要 I
ABSTRACT III
第1章 引言 1
1.1 背景 1
1.2 研究内容 2
第2章 升余弦滤波器 3
第3章 D/A转换 4
3.1 D/A转换原理 4
3.1.1 权电阻网络D/A转换器 4
3.1.2 梯形R-2R解码网 4
3.1.3 2nR+开关阵解码网简介 4
3.2 D/A转换器TLC7528介绍 5
3.3 系统D/A电路 6
第4章调制介绍 7
4.1调制简介 7
4.2调幅调制 7
4.2.1普通调幅调制（AM） 7
4.2.2抑制载波双边带调制（DSBSC） 8
4.2.3单边带调制（SSBSC） 9
4.3角度调制 9
4.3.1频率调制FM 10
4.3.2相位调制PM 10
第5章系统调制原理电路 11
5.1 BPSK调制介绍 11
5.2硬件电路 14
5.3分压电路 16
5.4 QPSK调制介绍 17
5.5移相器 18
5.5.1移相电路 18
5.5.2 RC移相 20
第6章 实验调试结果与分析 23
6.1 D/A滤波调试 23
6.2 分压乘法调试 24
6.3 移相调试 26
第7章 结束语 28
致谢 29
参考文献 30
附录1 系统原理图 31
附录2 乘法器PCB电路 32

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