非相干dcsk系统性能分析论文.doc

Classified Index:
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Dissertation for the Master Degree in Engineering
THE PERFORMANCE ANALYSIS
OF NON-COHERENT DCSK SYSTEM
Candidate:
Supervisor:
Academic Degree Applied for:
Specialty:
Affiliation:
Date of Defence:
Degree-Conferring-Institution:

Shi Ying
Associate Prof. Zhou Yigang
Master of Engineering
Information munication
Engineering
School of Electronics and
Information Technology
June, 2006
Harbin Institute of Technology
哈尔滨工业大学工学硕士学位论文
摘

要
混沌是非线性科学的一个重要分支,混沌理论的研究及其在通信中的应
用是当前科学界和工程领域的一个前沿课题,它为传统通信理论开辟了新的
研究领域,也为非线性科学提供了一个广阔的应用舞台。以往对混沌通信系
统的研究工作主要集中在调制方法和抗噪声性能分析上,而对其抗干扰和抗
多径衰落性能分析较少,而这却又是衡量系统性能优劣的重要特征。目前,
混沌键控系统是现有混沌通信系统中研究最多的。本文的主要工作是对非相
干差分混沌键控(DCSK)系统的抗多径衰落、抗干扰,及其多址接入能力进
行详细分析讨论。
文中首先讨论了非相干DCSK系统在给定 Eb / N 0 下,如何选择扩频系数
使其误码率最低问题。接着对非相干DCSK系统在瑞利衰落及多径瑞利衰落
信道下进行性能分析,通过仿真实验来验证理论分析结果,并与相干CSK系
统的抗多径衰落性能比较。其次,详细分析了相干CSK系统和非相干DCSK
系统的抗窄带正弦干扰能力,以及与传统扩频通信系统(以DS-SS为例)共存
时,传统扩频通信系统对它们的影响。
最后,在分析基于时隙的差分多址接入(TLMA-DCSK)方案的基础上,
提出了改进的时隙差分多址接入(TLMA-DCSK)方案。推导该方案的理论误
码性能,以零均值Logistic混沌映射为例进行仿真实验。对两方案进行性能
比较,得出改进TLMA-DCSK方案比TLMA-DCSK方案误码性能好。
关键词

混沌键控;非相干差分混沌键控;多径衰落;抗干扰;多址;
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哈尔滨工业大学工学硕士学位论文
Abstract
Chaos is an important branch of nonlinear science. The research of chaos
theory and its application munication is the frontier of science and
engineering, which provides a novel research field for mu-
nication theory and also presents a broad application platform for nonlinear
science. People used to focus mainly on modulating methods and noise
performance of chaos-munication system, but lack of multipath and
anti-jamming performance analysis, which is one important performance of any
communication system. Recently, Chaos shift keying system attracts much
attention in chaos-munication system. This paper focus mainly on
analyzing the performance of differential chaos shift keying(DCSK)system in
anti-jamming, multi-path fading and multiple access ability.
Firstly, how to choose spreading f