【摘要】：在當前的無線通信系統(tǒng)中,直接序列擴頻(DSSS)被廣泛應用,其擁有一定的處理增益,這也正是其具有抗干擾能力的主要因素。通信系統(tǒng)中會存在眾多干擾,其中經常性存在的有窄帶干擾,假如其干擾強度較大并且極具復雜性,而處理增益無法自行解決時,整個系統(tǒng)就很難進行工作。那么該怎樣將窄帶干擾抑制技術引入系統(tǒng)并提升系統(tǒng)的抗干擾能力是目前DSSS最主要的技術之一,在未來有很大的發(fā)展空間和前景。根據以上所述,本篇論文主要進行如下研究:(1)介紹DSSS通信系統(tǒng)的簡單模型,分析了整個信號處理的過程,闡明了處理增益和抗干擾能力的關系。在此基礎上描述了系統(tǒng)中最常見的窄帶干擾,并對擴頻通信系統(tǒng)的抗干擾能力進行分析,進一步說明了引入抗干擾技術的必要性。(2)根據系統(tǒng)模型來對變化域和時域窄帶干擾抑制技術進行研究,并設計了頻域和時域的預測技術,針對不同的窄帶干擾,所設計的技術也各不相同,同時針對不同設計的技術進行仿真研究和性能對比。(3)針對傳統(tǒng)的濾波器進行缺陷分析,同時針對其存在的不足和問題設計了采用變抽頭間隔的預測濾波器結構并闡述了相關原理。在不同的窄帶干擾之下對改進后的濾波器進行研究并對比分析。(4)針對頻域處理和改進的時域處理進行性能仿真對比,在對其進行對比的同時考慮系統(tǒng)所處的工作環(huán)境、所用資源、抗干擾要求等,鑒于多種考慮我們使用了7階時域變抽頭間隔適應線性預測濾波的方法來達到抑制窄帶干擾的目的。同時進行系統(tǒng)測試和調節(jié),得到的結果和理論分析保持一致。論文研究結果表明,改進后的預測器提升了系統(tǒng)的抗窄帶干擾能力,這也是預測濾波器在實際中的有效運用。
[Abstract]:In the current wireless communication systems, direct sequence spread spectrum (DSS) (DSSS) is widely used, which has a certain processing gain, which is the main factor of its anti-jamming ability. There are many interference in the communication system, among which there is a narrow band interference. If the interference intensity is large and the processing gain can not be solved by itself, the whole system will be difficult to work. So how to introduce the narrowband interference suppression technology into the system and improve the anti-jamming ability of the system is one of the most important technologies of DSSS at present, which has great development space and prospect in the future. According to the above, this paper mainly studies as follows: (1) introduce the simple model of DSSS communication system, analyze the whole process of signal processing, and clarify the relationship between processing gain and anti-jamming ability. On this basis, the most common narrowband interference in the system is described, and the anti-jamming ability of the spread spectrum communication system is analyzed. The necessity of introducing anti-jamming technology is further explained. (2) according to the system model, the narrowband interference suppression technology in variable domain and time domain is studied, and the prediction techniques in frequency domain and time domain are designed, aiming at different narrowband interference. At the same time, the simulation research and performance comparison of different design technology are carried out. (3) the defect analysis of traditional filter is carried out. At the same time, the structure of predictive filter with variable tap interval is designed and the related principle is explained. Under different narrowband interference, the improved filter is studied and compared. (4) the performance of frequency domain processing and improved time domain processing are simulated and compared, and the working environment of the system is considered while comparing them. In view of various considerations we use a 7-order time-domain variable tap interval adaptive linear predictive filtering method to suppress narrowband interference. At the same time, the system is tested and adjusted, and the results are consistent with the theoretical analysis. The research results show that the improved predictor improves the ability of the system to resist narrowband interference, which is also an effective application of the predictive filter in practice.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN914.42

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