离散调幅信号的智能解调实现
离散调幅信号的智能解调实现(任务书,开题报告,论文10000字)
摘 要
21世纪,软件无线电在军事与移动通信领域的应用范围是越来越广了,它的思想核心之处是尽可能在靠近天线的地方使用数模(D/A)和模数(A/D)转换器,数模(A/D)变换后的所有处理结果都可用数字信号处理器(DSP)来处理实现,并且尽可能多的依靠软件编程来实现无线传输的功能。
本文基于软件无线电原理,给出了一种对离散调幅信号进行数字解调的实现方法。该方法利用数字控制振荡器(Digital Controlled Oscillator)产生的数字正交载波将调幅信号进行数字下变频,经过数字滤波器(Digital Filter)处理后在信号的基带范围内进行处理,最后得到调制信号。
本文使用C语言编程实现了离散调幅信号的智能解调功能,并在Code Composer Studio(CCS)环境下绘制出最终的解调信号波形。
关键词:离散调幅 数字解调 软件无线电
Digital demodulation realization for discrete AM signals
Abstract
The 21st century software radio is one of the important research contents in the field of military and mobile communication. The core idea of software radio is to use A / D and D / A converters as close as possible to the antenna, and try to realize the wireless function in software, A variety of functions, including signal processing functions can be implemented in software, making the software radio with higher scalability and application environment adaptability. Software radio is based on modern communication theory, digital signal processing as the core, to microelectronics technology to support the new communication system. [资料来源:http://doc163.com]
Based on the principle of software radio, this paper presents a method to realize digital demodulation of discrete amplitude modulation signal. In this method, the digital signal is digitally down-converted by the digital quadrature carrier generated by the digital control oscillator, and the signal is processed in the baseband range after the digital filter processing to obtain the modulation signal.
In this paper, the intelligent demodulation function of discrete amplitude modulation signal is realized by C programming, and the final demodulated signal waveform is drawn in Code Composer Studio (ccs). the distortion of demodulated signal The smaller, this experiment will appear the first distortion waveform.
Keywords: Discrete AM; Digital demodulation; Software radio
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目 录
摘 要 I
Abstract II
第一章 绪论 1
1.1 引言 1
1.2论文设计的初衷 1
1.3 国内外的研究现状 2
1.3.1 国外研究现状 2
1.3.2 国内研究现状 3
1.4 本文所做的工作 2
第二章 软件无线电中关于数字信号处理的原理 4
2.1 信号采样理论 4
2.1.1 基本采样理论——Nyquist采样定理 4
2.1.2 带通采样理论在数字信号中的应用 5
2.2 A/D转换原理 5
2.3 离散调幅信号的数字解调原理 8
2.3.1 数字正交变换算法在多相滤波中的应用 8 [版权所有:http://DOC163.com]
2.3.2 离散调幅信号的数字解调算法 9
2.3.3 多相滤波器的设计原理 9
2.4 DSP开发设计基础 13
2.4.1 DSP概述 13
2.4.2 常用信号处理算法 14
2.4.3 信号处理的DSP软件实现 16
第三章 离散调幅信号的数字解调实现 18
3.1 DAM序列的解调实现 18
3.1.1 AM信号的正交变换实现 18
3.1.2 多相分支滤波器的实现 20
3.1.3 离散信号卷积过程的实现 22
3.1.4 序列的最终解调实现 23
3.2 结果分析 24
第四章 总结和展望 29
4.1 总结评价 29
4.2 展望 29
参考文献 30
致 谢 31
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