数字频带传输系统研究.doc

石家庄铁道大学四方学院毕业设计 数字频带传输系统研究 Research of Digital Frequency Transmission System 指导教师签字 时 间 年 月 日 摘　要 本文主要研究数字频带传输系统基本原理，包括二进制和多进制数字调制和解调原理，然后对调制和解调原理进行仿真，并对结果进行分析。 对二进制的数字频带系统，重点研究二进制振幅键控（2ASK）、二进制频移键控（2FSK）、二进制相移键控（2PSK）、二进制差分相移键控（2DPSK）的调制和解调原理，并对各个系统的功率谱进行分析；对多进制数字调制系统，研究了多进制振幅调制、多进制频率调制、多进制相位调制的原理，并以四进制为例对各个系统进行仿真，最后对系统的有效性进行分析。 关键词：频带传输　调制与解调　幅度键控　频移键控　相移键控 Abstract This paper studies the basic principles of digital band transmission systems, including binary and multi-band digital modulation and demodulation, Also principles of the modulation and demodulation are simulated, with the results analyzed. For the binary digital frequency transmission system, this paper focuses on the modulation and demodulation of the binary amplitude shift keying (2ASK), binary frequency shift keying (2FSK), binary phase shift keying (2PSK), binary differential phase shift keying (2DPSK) , and the power spectrum of each system is analyzed. For the M-ary digital frequency transmission system, this paper focuses on the basic principles of M-ary amplitude modulation, M-ary frequency modulation, M-ary phase modulation. Also simulation is accomplished, with the results analyzed. Keywords: Frequency-Band transmission　Modulation and demodulation　Amplitude shift keying　Frequency shift keying　Phase shift keying PAGE II 目　录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc294296899 第1章　绪论 PAGEREF _Toc294296899 \h 1 HYPERLINK \l _Toc294296900 1.1　研究的背景 PAGEREF _Toc294296900 \h 1 HYPERLINK \l _Toc294296901 1.2　研究的意义 PAGEREF _Toc294296901 \h 3 HYPERLINK \l _Toc294296902 1.3　国内外研究现状 PAGEREF _Toc294296902 \h 4 HYPERLINK \l _Toc294296903 1.4　主要研究内容 PAGEREF _Toc294296903 \h 5 HYPERLINK \l _Toc294296904 第2章　数字频带传输系统的研究 PAGEREF _Toc294296904 \h 6 HYPERLINK \l _Toc294296905 2.1　数字频带传输系统的概述 PAGEREF _Toc294296905 \h 6 HYPERLINK \l _Toc294296906 2.2　二进制数字频带传输系统 PAGEREF _Toc294296906 \h 6 HYPERLINK \l _Toc294296907 2.2.1　二进制振幅键控（2ASK） PAGEREF _Toc294296907 \h 6 HYPERLINK \l