用DFT方法检测白噪声中频率确知的正弦信号

范文编号:DZXX124  范文字数:11494,页数:32

摘要

 SystemView 6.0是美国ELANIX公司开发的用于系统设计和仿真的工具软件，本课题选用SystemView仿真分析软件，构建用DFT法检测白噪声中正弦信号的仿真分析系统，并将结果与AWGN中正弦信号最佳相干检测的漏检率，虚警率性能做比较。
 本文第一章主要讲述了通信系统中信号检测，以及系统仿真分析的重要性。第二章通过对最佳相干接收的差错概率的理论分析，讨论了最佳接收机的建立和最优判决门限的设定，并以AWGN噪声中正弦信号检测为例，说明了2ASK信号的解调及抗噪声性能。第三章提出了用DFT法在白噪声中检测频率确知的正弦信号系统模型，对此进行了理论分析。第四章利用SystemView分别对两种方法检测正弦信号的系统进行仿真分析。利用DFT法进行正弦信号检测的结果表明，虽然未能对检测器进行性能分析，但有提示作用。
 
关键词：正弦信号检测，相干接收机，DFT，SystemView

ABSTRACT

 SystemView 6.0 is the ELANIX company development for system design and simulation tools. By means of SystemView, the simulation system is set up, which shows the DFT method of detecting a sinusoidal signal with a known frequency in the additive white Gaussian noise(AWGN). And the simulation results are compared with the theoretical miss rate or false-alarm rate of the best coherent detection.
 The first chapter of this paper basically described the communication system, signal detection system and importance of simulation analysis. The second chapter, Taking a 2ASK system as an example for sinusoidal signal detection in AWGN, analyzed the theoretical error probability of the best coherent receiver, and discussed the optimal threshold how to set. The third chapter proposed the DFT method of detecting sinusoidal signal with a known frequency in AWGN. The fourth chapter showed the simulation results of two detecting methods. The simulation results indicate that the DFT method of detecting of a sinusoidal signal with a known frequency in AWGN has implications.
Keywords: Sinusoidal signal detection, Coherent receiver, DFT, SystemView
 
目录

摘要 I
ABSTRACT II
第1章 引言 1
1.1 背景 2
1.2 研究内容 2
第2章 加性白噪声信道传输的数字基带信号接收 4
2.1 接收机模型 4
2.2 信号的匹配滤波器 4
2.3 信号的判决门限 5
2.4 最佳差错性能 6
2.5 ASK信号的解调及抗噪声性能 7
2.5.1 非相干解调及性能 7
2.5.2 相干解调及抗噪声性能 10
第3章 用DFT方法检测白噪声中的正弦信号 13
3.1 模型 13
3.2 理论分析 13
3.3系统设计流程图 15
第4章 SystemView仿真分析 16
4.1 SystemView简介 16
4.2 2ASK最佳相干接收系统的仿真分析 16
4.2.1 系统的图符选择 16
4.2.2 系统设计 17
4.2.3 仿真分析 19
4.3利用DFT检测白噪声中正弦信号的仿真分析 20
4.3.1 系统说明 20
4.3.2 数据处理 22
4.3.3 对比 24
第5章 结束语 27
致谢 28

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