發(fā)布時(shí)間：2018-05-17 08:17

  本文選題：調(diào)制解調(diào) + QDPSK　； 參考：《南京理工大學(xué)》2014年碩士論文

【摘要】：數(shù)字調(diào)制解調(diào)技術(shù)是數(shù)字通信系統(tǒng)的關(guān)鍵技術(shù)之一,也是制約數(shù)字通信系統(tǒng)研究的瓶頸。數(shù)字調(diào)制解調(diào)技術(shù)的研究,不僅對于進(jìn)一步提高數(shù)字通信系統(tǒng)能力有著非常重要的意義,而且在未來的通信系統(tǒng)中將有非常廣闊的應(yīng)用前景。因此,開展全數(shù)字QDPSK調(diào)制解調(diào)技術(shù)的研究具有重要的意義。 本文介紹了調(diào)制解調(diào)系統(tǒng)所用到的基本理論知識,對QDPSK全數(shù)字調(diào)制解調(diào)技術(shù)的原理進(jìn)行了深入的研究,并給出系統(tǒng)的設(shè)計(jì)框圖。QDPSK調(diào)制部分主要包括數(shù)據(jù)加擾、卷積編碼、差分編碼、基帶成型濾波、內(nèi)插濾波和正交調(diào)制,解調(diào)部分則主要有數(shù)字下變頻、匹配濾波、差分譯碼、維特比譯碼、數(shù)據(jù)解擾及同步技術(shù),論文在分析各個(gè)模塊原理的基礎(chǔ)上進(jìn)行了MATLAB仿真,給出了仿真結(jié)果并對其進(jìn)行分析。其中,重點(diǎn)研究了同步技術(shù),對載波頻偏估計(jì)、載波恢復(fù)環(huán)路及符號同步環(huán)路進(jìn)行了詳細(xì)的介紹,通過對多種同步算法的分析和比較,選取了基于FFT的頻偏估計(jì)算法對載波進(jìn)行大頻偏校正,Costas交叉環(huán)進(jìn)行載波相位跟蹤和基于Gardner算法的全數(shù)字反饋值插值符號同步,并對算法進(jìn)行了理論分析和基于MATLAB的仿真。最后,還對整個(gè)系統(tǒng)進(jìn)行了性能仿真,給出了系統(tǒng)的誤碼率特性。
[Abstract]:Digital modulation and demodulation technology is one of the key technologies of digital communication system, and it is also the bottleneck of digital communication system research. The research of digital modulation and demodulation technology is not only of great significance for further improving the capability of digital communication system, but also has a very broad application prospect in the future communication system. Therefore, it is of great significance to develop the full-digital QDPSK modulation and demodulation technology. In this paper, the basic theory of modulation and demodulation system is introduced, and the principle of QDPSK full digital modulation and demodulation technology is deeply studied, and the design block diagram of the system is given. The QDPSK modulation part mainly includes data scrambling and convolution coding. Differential coding, baseband shaping filtering, interpolation filtering and quadrature modulation, and demodulation mainly include digital downconversion, matched filtering, differential decoding, Viterbi decoding, data descrambling and synchronization techniques. On the basis of analyzing the principle of each module, the MATLAB simulation is carried out, and the simulation results are given and analyzed. Among them, the synchronization technology is studied in detail. The carrier frequency offset estimation, carrier recovery loop and symbol synchronization loop are introduced in detail. Through the analysis and comparison of various synchronization algorithms, The frequency offset estimation algorithm based on FFT is selected to track the carrier phase of the large frequency offset correction Costas crossover loop and the full digital feedback value interpolation symbol synchronization based on the Gardner algorithm. The algorithm is analyzed theoretically and simulated based on MATLAB. Finally, the performance of the whole system is simulated, and the BER characteristic of the system is given.
【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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