本文選題：調(diào)制識別 + 特征提取��； 參考：《南京理工大學(xué)》2014年碩士論文

【摘要】：通信信號的調(diào)制方式識別及調(diào)制參數(shù)的估計(jì)是通信信號處理領(lǐng)域的一個重要研究課題,在信號自適應(yīng)識別、頻譜監(jiān)測和無線監(jiān)聽等方面都有著廣泛的應(yīng)用。隨著通信技術(shù)的飛速發(fā)展,通信信號的體制和調(diào)制樣式變得更加復(fù)雜多樣,調(diào)制識別也變得更加重要。調(diào)制識別的目的就是在先驗(yàn)信息不足的情況下,正確的識別出通信信號的調(diào)制類型,并估計(jì)其調(diào)制參數(shù)進(jìn)行解調(diào)。 本文基于軟件無線電平臺設(shè)計(jì)了一種新型數(shù)字通信識別解調(diào)系統(tǒng)。先用修正周期圖法和恒虛警處理來檢測信號。再采用順序正交下變頻和可變次數(shù)的抽取提高信噪比。然后通過提取信號的瞬時特征參量來完成對2FSK、 GMSK、 BPSK、 QPSK這四種調(diào)制信號和兩種導(dǎo)航信號的識別。最后估計(jì)通信信號的調(diào)制參數(shù)并解調(diào),其中符號速率的估計(jì)利用數(shù)字信號的循環(huán)自相關(guān)特性,定時算法采用平方濾波法和三階拉格朗日內(nèi)插法。導(dǎo)航信號采用脈沖重復(fù)間隔(PRI)的直方圖統(tǒng)計(jì)算法來識別TACAN和JTIDS兩種導(dǎo)航信號。本文采用的調(diào)制識別算法運(yùn)算量小,并且具有較好的擴(kuò)展性。
[Abstract]:Modulation mode identification and modulation parameter estimation of communication signal is an important research topic in the field of communication signal processing. It has been widely used in signal adaptive identification, spectrum monitoring and wireless monitoring. With the rapid development of communication technology, communication signal systems and modulation patterns become more complex and diverse, and modulation recognition becomes more important. The purpose of modulation recognition is to correctly identify the modulation type of communication signal and estimate its modulation parameters to demodulate under the condition of lack of prior information. This paper designs a new digital communication identification and demodulation system based on software radio platform. First, the modified period diagram and CFAR processing are used to detect the signal. Then sequential orthogonal downconversion and variable number decimation are used to improve SNR. Then, by extracting the instantaneous characteristic parameters of the signal, the recognition of the 2FSK, GMSK, BPSK, QPSK and two navigation signals is completed. Finally, the modulation parameters of the communication signal are estimated and demodulated. The symbol rate is estimated by the cyclic autocorrelation property of the digital signal. The timing algorithm uses the square filtering method and the third order Lagrangian interpolation method. The TACAN and JTIDS navigation signals are identified by the histogram statistical algorithm of pulse repeat interval (PRI). The modulation recognition algorithm used in this paper has less computation and better expansibility.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN911.3

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本文編號：1955172