擴(kuò)頻通信系統(tǒng)抗干擾分析

電子通信論文編號(hào):TX166 附開題報(bào)告,任務(wù)書,及前期過程資料,論文字?jǐn)?shù):23423,頁數(shù):40 

目   錄

1緒論………………………………………………………………………………1
2 擴(kuò)頻通信系統(tǒng)………………………………………………………………………2
2.1 擴(kuò)頻技術(shù)的歷史 ………………………………………………………………………2
2.2 擴(kuò)頻通信系統(tǒng)的工作環(huán)境…………………………………………………………4
2.3 擴(kuò)頻通信的原理和理論基礎(chǔ)………………………………………………………4
2.4 擴(kuò)頻的實(shí)現(xiàn)方式……………………………………………………………………5
2.5 擴(kuò)頻系統(tǒng)的信道使用 …………………………………………………………………6
2.6 擴(kuò)頻通信的特點(diǎn) ………………………………………………………………………6
2.7 應(yīng)用范圍 ………………………………………………………………………………7
3 擴(kuò)頻通信系統(tǒng)的抗干擾技術(shù) ……………………………………………………………………8
3.1擴(kuò)頻抗干擾技術(shù) ………………………………………………………………………8
3.2 擴(kuò)頻碼的作用…………………………………………………………………………14
3.3 信道編碼………………………………………………………………………………16
3.4 空域、時(shí)域自適應(yīng)濾波技術(shù)…………………………………………………………19
3.5 自適應(yīng)天線技術(shù)………………………………………………………………………19
3.6 自適應(yīng)功率控制技術(shù)…………………………………………………………………20
3.7 自適應(yīng)干擾對(duì)消系統(tǒng)…………………………………………………………………20
4 一些新的抗干擾技術(shù) …………………………………………………………………21
4.1二維擴(kuò)頻………………………………………………………………………………21
4.2多輸入多輸出技術(shù)…………………………………………………………………23
4.3超寬帶脈沖無線電技術(shù)……………………………………………………………24
4.4自編碼擴(kuò)頻…………………………………………………………………………25
5直接序列擴(kuò)頻通信系統(tǒng)仿真方案………………………………………………………27
5.1 Simulink簡介 …………………………………………………………………………27
5.2實(shí)現(xiàn)方法………………………………………………………………………………30
結(jié)論 ………………………………………………………………………………………34
致謝 …………………………………………………………………………………35
參考文獻(xiàn)………………………………………………………………………………36

摘 要

 隨著人們生活質(zhì)量的提高，無線用戶的數(shù)量以驚人的速度迅速增長，到處充斥著各種頻率的電磁波，導(dǎo)致本已惡劣的通信環(huán)境更加惡劣。所以通信系統(tǒng)的抗干擾性能越來越成為人們關(guān)注的焦點(diǎn)。擴(kuò)頻通信系統(tǒng)的抗干擾技術(shù)包括擴(kuò)頻抗干擾技術(shù)和非擴(kuò)頻抗干擾技術(shù)兩大類，這兩類技術(shù)在現(xiàn)行的擴(kuò)頻通信系統(tǒng)中都有著廣泛的應(yīng)用。在重點(diǎn)分析包括擴(kuò)頻抗干擾技術(shù)、智能天線技術(shù)、二維擴(kuò)頻、自編碼擴(kuò)頻等在內(nèi)的抗干擾技術(shù)的基礎(chǔ)上，在Matlab仿真平臺(tái)上完成了對(duì)直接序列擴(kuò)頻通信系統(tǒng)的仿真，模擬了直接序列擴(kuò)頻通信的實(shí)現(xiàn)過程。通過對(duì)仿真事件的結(jié)果分析，得出了在相同誤碼率下，增大擴(kuò)頻增益，可以提高系統(tǒng)輸出端的信噪比，從而提高系統(tǒng)的抗干擾能力的結(jié)論。

關(guān)鍵詞   擴(kuò)頻通信  擴(kuò)頻碼  信道編碼  二維擴(kuò)頻

Title        The Interference Analysis Of Spread Spectrum     

                    Communication System                

Abstract
As the quality of people’s life is improved, the number of wireless users growthed very rapidly，and everywhere awash with the frequency of the electromagnetic wave, this has led to the poor communications environment even worse. Therefore, the communication system’s anti-jamming performance has increasingly become the focus of people’s attention. The spread spectrum communication system’s anti-jamming technology including two kinds, spread spectrum anti-jamming technology and non-spread spectrum anti-jamming technology. The two kinds technology both have widely used in today’s spread spectrum communication system. On the base of laid special stress on analyse the anti-jamming technology including spread spectrum anti-jamming technology, smart antenna technology, two-dimensional spread spectrum, and coding itselfly spread spectrum，I accomplished a simulation plan of the direct sequence spread spectrum communication system through the Matlab, simulated the realize process of the direct sequence spread spectrum communication system successfully. Through the analysis of the result of the simulation event, I get the conclusion that on the base of the same error rate, if you increase the spread spectrum gain, you can increase the signal-to-noise ratio on the output port, thus increased the anti-jamming ability.

Key Words   Spread Spectrum Communications    Spreading Codes  
Channel Coding    Two-dimensional spread spectrum