發(fā)布時間：2018-05-18 23:13

  本文選題：調(diào)制 + 解調(diào)　； 參考：《大連海事大學》2013年碩士論文

【摘要】：調(diào)制解調(diào)技術(shù)作為一項關鍵技術(shù)在通信系統(tǒng)里被應用廣泛,能夠有效提高通信系統(tǒng)的性能。數(shù)字調(diào)制解調(diào)技術(shù)在數(shù)字加密之后易于集成,抗干擾能力強,而且在組建網(wǎng)絡上更加靈活。在現(xiàn)代通信技術(shù)的發(fā)展過程中,高性能數(shù)字調(diào)制解調(diào)技術(shù)以及調(diào)制解調(diào)新技術(shù)一直是研究的重點,GMSK最小高斯頻移鍵控技術(shù)在很多現(xiàn)代通信系統(tǒng)中得到了應用。SOC芯片設計是目前信息技術(shù)發(fā)展的重要技術(shù),它是具有自主知識產(chǎn)權(quán)通信設備設計的核心技術(shù),因此本設計重點研究基于FPGA芯片,利用SOC設計技術(shù)實現(xiàn)GMSK的調(diào)制解調(diào)術(shù)。 本課題首先深入研究GMSK信號的調(diào)制與解調(diào)原理,然后利用FPGA芯片進行GMSK技術(shù)的SOC設計與實現(xiàn)。開發(fā)環(huán)境是Xilinx公司提供的ISE12.3軟件開發(fā)平臺,在這個開發(fā)平臺上基于軟件無線電的思想,進行Verilog HDL語言的軟件編程設計,通過Modelsim6.5進行功能上的仿真,通過Virtex-4開發(fā)板進行調(diào)試,通過ChipScope Pro對信號各線路進行分析,最終實現(xiàn)了GMSK信號的調(diào)制和解調(diào)功能。本課題詳細分析GMSK調(diào)制解調(diào)方案,并在實現(xiàn)上進行優(yōu)化。比如GMSK調(diào)制中,需要用到FIR濾波器平滑碼元信號。在設計中為了得到更好的平滑效果,在濾波器之后額外增加了兩個內(nèi)插濾波器,從而使信號更加平滑。在GMSK解調(diào)中,重點分析載波提取電路、碼元同步電路、積分判決和解調(diào)判決等模塊。本設計已經(jīng)在軟硬件上分別進行了功能調(diào)試,得到了理想的效果。 本研究內(nèi)容是導航研究所承擔的國家支撐計劃課題"AIS/GNSS船載導航設備關鍵技術(shù)與系統(tǒng)研制”(2012BAH36B02)的部分內(nèi)容。
[Abstract]:As a key technology, modulation and demodulation technology is widely used in communication systems, which can effectively improve the performance of communication systems. Digital modulation and demodulation technology is easy to integrate after digital encryption, strong anti-jamming ability, and more flexible in constructing network. In the course of the development of modern communication technology, High performance digital modulation and demodulation technology and new modulation and demodulation technology have been the focus of research. GMSK minimum Gao Si frequency shift keying technology has been applied in many modern communication systems. SoC chip design is an important technology in the development of information technology. It is the core technology of communication equipment design with independent intellectual property, so this design focuses on the realization of GMSK modulation and demodulation based on FPGA chip and SOC design technology. In this paper, the principle of modulation and demodulation of GMSK signal is studied deeply, and then the SOC design and implementation of GMSK technology using FPGA chip is carried out. The development environment is the ISE12.3 software development platform provided by Xilinx Company. Based on the idea of software radio, the software programming design of Verilog HDL language is carried out on the platform, the function simulation is carried out through Modelsim6.5, and the debugging is carried out through Virtex-4 development board. Finally, the modulation and demodulation functions of GMSK signal are realized by analyzing the signal circuits by ChipScope Pro. This paper analyzes the scheme of GMSK modulation and demodulation in detail, and optimizes the implementation. For example, in GMSK modulation, FIR filter is used to smooth symbol signal. In order to obtain better smoothing effect, two interpolation filters are added after the filter to make the signal smoother. In GMSK demodulation, the modules of carrier extraction circuit, symbol synchronization circuit, integral decision and demodulation decision are analyzed. The design has been debugged in the software and hardware, and the ideal effect has been obtained. This research is a part of the national support project "key Technology and system Development of AIS/GNSS Shipboard Navigation equipment" (2012BAH36B02).
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TN47

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本文編號：1907628