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QPSK直接序列扩频系统的分析与仿真
摘要：本设计研究的是QPSK直接序列扩频系统，由于系统具有抗干扰性强、隐蔽性好、易于实现码分多址（CDMA）、抗多径干扰、直扩通信速率高等优点，因此在扩频通讯方面有很大的优势。本设计阐述了QPSK直接序列扩频系统的基本原理与优势，并利用Systemview软件对工作在802.11协议下的QPSK直接序列扩频系统进行仿真。本设计给出了各个仿真模块以及波形，涉及的内容有：差分编码与解码，扩频与解扩，QPSK信号的调制与解调，以及载波同步等内容。
本论文中第2章到第3章的内容是为第4章的内容做准备的，而第4章内容着重讨论QPSK直接序列扩频系统的基本原理。因此前面几章节内容都只是一些理论上的基础知识，其目的是为后面的系统仿真做好充分的准备。所以第5章才是本论文中的最为重点内容。
关键词：Systemview 、QPSK、载波同步、CDMA。
本设计研究的是QPSK直接序列扩频系统，由于系统具有抗干扰性强、隐蔽性好、易于实现码分多址（CDMA）、抗多径干扰、直扩通信速率高等优点，因此在扩频通讯方面有很大的优势。
What this design study is the QPSK direct sequence to expand Pin system, because the system has anti- interference strong, concealment good, be easy to carry out code many path interferences with many addresses(CDMA), anti- for cent and keep expand Gao Deng3's advantage of the correspondence velocity, so have very big advantage in the aspects of expanding Pin communication.
本设计阐述了QPSK直接序列扩频系统的基本原理与优势，并利用Systemview软件对工作在802.11协议下的QPSK直接序列扩频系统进行仿真。
This design elaborated the QPSK direct sequence expands basic principle and advantage of Pin system, and make use of Systemview software to the work under 802.11 agreements of the QPSK direct sequence expand Pin system to carry on imitate really.
本设计给出了各个仿真模块以及波形，涉及的内容有：
The origin designed to each imitate true mold piece and wave form, involve of the contents have:
差分编码与解码，扩频与解扩，QPSK信号的调制与解调，以及载波同步等内容。
Bad cent code with decoding, expand Pin and solution to expand, the make of QPSK signal adjusts with solution, and carries wave to synchronously wait a contents.
本论文中第2章到第3章的内容是为第4章的内容做准备的，而第4章内容着重讨论QPSK直接序列扩频系统的基本原理。
Chapter 2 contents which arrive chapter 3 does preparation for the contents of chapter 4 in this thesis, but chapter 4 contents emphasize the basic principle that the direct sequence of the discussion QPSK expands Pin system.
因此前面几章节内容都只是一些理论上的基础知识，其目的是为后面的系统仿真做好充分的准备。
Therefore before several chapter contentses are theoretically all just some of foundation knowledge, its purpose is for behind of the system imitate to really work well full preparation.
所以第5章才是本论文中的最为重点内容。
So chapter 5 be in this thesis of is a point contents most .
关键词：
Keyword:
Systemview 、QPSK、载波同步、CDMA。
Systemview, QPSK, carry wave synchronous, CDMA.
What this design study is the QPSK direct sequence to expand Pin system, because the system has anti- interference strong, concealment good, be easy to carry out code many path interferences with many addresses(CDMA), anti- for cent and keep expand Gao Deng3's advantage of the correspondence velocity, so have very big advantage in the aspects of expanding Pin communication.
本设计阐述了QPSK直接序列扩频系统的基本原理与优势，并利用Systemview软件对工作在802.11协议下的QPSK直接序列扩频系统进行仿真。
This design elaborated the QPSK direct sequence expands basic principle and advantage of Pin system, and make use of Systemview software to the work under 802.11 agreements of the QPSK direct sequence expand Pin system to carry on imitate really.
本设计给出了各个仿真模块以及波形，涉及的内容有：
The origin designed to each imitate true mold piece and wave form, involve of the contents have:
差分编码与解码，扩频与解扩，QPSK信号的调制与解调，以及载波同步等内容。
Bad cent code with decoding, expand Pin and solution to expand, the make of QPSK signal adjusts with solution, and carries wave to synchronously wait a contents.
本论文中第2章到第3章的内容是为第4章的内容做准备的，而第4章内容着重讨论QPSK直接序列扩频系统的基本原理。
Chapter 2 contents which arrive chapter 3 does preparation for the contents of chapter 4 in this thesis, but chapter 4 contents emphasize the basic principle that the direct sequence of the discussion QPSK expands Pin system.
因此前面几章节内容都只是一些理论上的基础知识，其目的是为后面的系统仿真做好充分的准备。
Therefore before several chapter contentses are theoretically all just some of foundation knowledge, its purpose is for behind of the system imitate to really work well full preparation.
所以第5章才是本论文中的最为重点内容。
So chapter 5 be in this thesis of is a point contents most .
关键词：
Keyword:
Systemview 、QPSK、载波同步、CDMA。
Systemview, QPSK, carry wave synchronous, CDMA.
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第1个回答 2008-06-06
QPSK direct sequence spread spectrum system's analysis and simulation abstract: What this design research is the QPSK direct sequence spread spectrum system, because the system has the anti-jamming to be strong, the confidentiality good, easy to realize the code division multiple access (CDMA), the anti-multi-diameter disturbance, to expand the correspondence speed higher merit straight, therefore has the very big superiority in the wide frequency communication aspect. This design elaborated the QPSK direct sequence spread spectrum system's basic principle and the superiority, and carry on the simulation using the Systemview software to the work under 802.11 agreement's QPSK direct sequence spread spectrum systems. This design has given each simulation module as well as the profile, involves the content includes: Differential coding and decoding, wide frequency and despread, QPSK signal modulation and demodulation, as well as contents and so on carrier synchronization. in the present paper is prepares the 2nd chapter to the 3rd chapter of content for the 4th chapter of content, but the 4th chapter of content discusses the QPSK direct sequence spread spectrum system's basic principle emphatically. Therefore front several chapter contents are only some elementary knowledges theoretically, its goal is makes the full preparation for the following system simulation. Therefore 5th chapter of is in the present paper keiest content. key word: Systemview, QPSK, carrier synchronization, CDMA.
第2个回答 2020-02-20
如果发给你这段文字的是女孩，这说明她要和你分手，如果是男孩，这说明他要离你而去，也可以说是生离死别．
第3个回答 2019-03-11
她没有离开他
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