52頁 2.7萬字

摘 要

在準(zhǔn)同步CDMA 通信系統(tǒng)中，對所采用擴頻地址碼的要求是在同步誤差范圍內(nèi)(零時延附近)具有理想的相關(guān)特性，零相關(guān)區(qū)(ZCZ)序列偶和零相關(guān)區(qū)(ZCZ)序列偶集合就是能夠滿足這樣要求的序列。
本文介紹了ZCZ序列偶的定義、存在的必要條件、自相關(guān)函數(shù)的變換性質(zhì)、峰值特性、ZCZ互補序列偶的概念、ZCZ序列偶的構(gòu)造方法以及ZCZ序列偶集合的定義、變換性質(zhì)、產(chǎn)生方法及性能，并通過漸近率來表示ZCZ序列偶的理論限，在此理論的基礎(chǔ)上用MATLAB進行軟件仿真。另外，本文還介紹了序列偶在信號處理、通信系統(tǒng)中的應(yīng)用，ZCZ序列偶集合在準(zhǔn)同步CDMA系統(tǒng)中的應(yīng)用。
仿真結(jié)果表明，ZCZ 序列偶集合是一種特殊的二元零相關(guān)區(qū)序列，它大量存在，且性能優(yōu)良，適于作準(zhǔn)同步CDMA 系統(tǒng)的擴頻序列。

關(guān)鍵詞　ZCZ序列偶；ZCZ序列偶集合； MATLAB

Abstract
In the quasi-synchronous CDMA system, the request to adopt the spreading sequence is that the sequence should have perfect correlation properties in the synchronous error (near the zero time delay), the zero-correlation zone(ZCZ) sequence is just fit for the need.
The paper introduces the definition of ZCZ sequence pair, the necessary condition of the being of ZCZ sequence pair, peak value characteristic, construction methods and the transform properties of the self-correlation function; the definition of the ZCZ complementary sequence pair and the definition of ZCZ sequence pair set, the transform properties of the self-correlation function, construction methods and performance; and expresses the theory bound of the ZCZ sequence pair set with the rate of the approaching.　At the last, software simulation is done with MATLAB. What’s the more, the paper introduces the application of the sequence pair in the treatment of the signal and in the communication systems, in the quasi-synchronous CDMA system.
The result of the simulation indicates that the ZCZ sequence pair set is a peculiar binary zero correlation sequence. At the same time, its performance is perfect, it is befitting to use as the spread spectrum sequence in the quasi-synchronous CDMA system.


KeywordsZCZ sequence pair; ZCZ sequence pair set; MATLAB


目  錄

摘 要 I
Abstract II
第1章 緒論 1
1.1 課題背景 1
1.2 序列偶的應(yīng)用 1
1.2.1 序列偶在信號處理中的應(yīng)用 2
1.2.2 序列偶在通信系統(tǒng)中的應(yīng)用 3
1.3 零相關(guān)區(qū)序列的研究進展 3
1.4 論文內(nèi)容安排 4
第2章 ZCZ序列偶的基本理論 6
2.1 序列偶的基本理論 6
2.1.1 序列偶的基本概念 6
2.1.2 序列偶自相關(guān)函數(shù)的變換性質(zhì) 8
2.2 ZCZ序列偶的基本理論 10
2.2.1 ZCZ序列偶的定義 10
2.2.2 ZCZ互補序列偶的定義 11
2.2.3 ZCZ序列偶的構(gòu)造 12
2.2.4 ZCZ序列偶存在的必要條件 13
2.2.5 ZCZ序列偶的峰值特性 14
2.2.6 ZCZ序列偶的變換性質(zhì) 16
2.3  本章小結(jié) 18
第3章 ZCZ序列偶集合的理論研究 20
3.1 ZCZ序列偶集合的基本概念 20
3.2 ZCZ序列偶集合的變換性質(zhì) 21
3.3 ZCZ序列偶集合的理論限 23
3.4 ZCZ序列偶集合的設(shè)計 24
3.5 ZCZ序列偶集合的性能分析 28
3.6 ZCZ序列偶集合在準(zhǔn)同步CDMA系統(tǒng)中的應(yīng)用 29
3.7 本章小結(jié) 30
第4章 ZCZ序列偶及ZCZ序列偶集合的MATLAB仿真 31
4.1MATLAB簡介 31
4.2 實現(xiàn)算法 31
4.3 本章小結(jié) 38
結(jié)    論 39
參考文獻 40
附錄1 42
附錄2 43
致謝 44