本文關(guān)鍵詞： DCR 4FSK調(diào)制解調(diào) 軟件無線電　出處：《沈陽航空航天大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：如今的專業(yè)無線通信領(lǐng)域,數(shù)字集群對講機是最重要的通信方式。在剛剛過去幾十年里,模擬對講機占據(jù)了大部分市場。但隨著人們對無線通信質(zhì)量要求的提高以及頻譜資源的日益高漲,模擬對講機已經(jīng)很難適應(yīng)現(xiàn)在的通信環(huán)境。因此,我國和全球的對講機正在由模擬向數(shù)字轉(zhuǎn)變。數(shù)字對講機不僅能夠完成模擬對講機的基本通信功能,同時能夠?qū)崿F(xiàn)文本信息等數(shù)據(jù)傳輸功能。數(shù)字信號易通過計算機處理,因此數(shù)字對講機的通訊能力、功能和質(zhì)量就要比模擬對講機要好,可以滿足現(xiàn)代專用無線通信的需要。本文研究日本無線電工業(yè)協(xié)會2010年最新修訂的DCR數(shù)字對講機標(biāo)準(zhǔn),它采用4FSK調(diào)制解調(diào)方式,FDMA技術(shù),碼元速率為4.8kbps,可以同時進行數(shù)據(jù)和語音通信。針對DCR標(biāo)準(zhǔn)設(shè)計的調(diào)制解調(diào)系統(tǒng),重點研究4FSK頻率調(diào)制與解調(diào)原理、4FSK基帶信號處理關(guān)鍵理論,并在軟件無線電平臺上具體實現(xiàn)DCR系統(tǒng)。本文首先介紹了DCR標(biāo)準(zhǔn)的4FSK調(diào)制解調(diào)系統(tǒng)的理論方案,闡述4FSK調(diào)制和解調(diào)的基本原理,介紹了相關(guān)基帶信號處理的理論;其次,提出了DCR調(diào)制解調(diào)系統(tǒng)的具體的設(shè)計方案。對該系統(tǒng)中的基帶信號處理模塊的基本理論進行設(shè)計與仿真,主要包括均方根余弦滾降濾波器、Isinc濾波器和幀同步檢測器的設(shè)計。之后對DCR系統(tǒng)射頻模塊的4FSK頻率調(diào)制解調(diào)方案進行仿真驗證,分析相干解調(diào)與非相干解調(diào)算法的誤碼率曲線,確定最終方案。然后,搭建的DCR系統(tǒng)4FSK調(diào)制解調(diào)器軟件無線電平臺,闡述數(shù)據(jù)采集模塊設(shè)計、FIR濾波器的CSD量化編碼設(shè)計,并在系統(tǒng)平臺上對基帶調(diào)制解調(diào)系統(tǒng)進行實現(xiàn);最后,介紹了DCR系統(tǒng)平臺硬件結(jié)構(gòu),對平臺中主要模塊進行測試,給出測試結(jié)果。
[Abstract]:Digital trunked talkies are the most important means of communication in the field of professional wireless communications today. Analog interphone has occupied most of the market. However, with the improvement of wireless communication quality and the rising of spectrum resources, it is very difficult for analog interphone to adapt to the current communication environment. The interphone of our country and the whole world is changing from analog to digital. Digital interphone can not only complete the basic communication function of analog interphone, but also realize the function of data transmission, such as text information. Therefore, the communication capability, function and quality of the digital interphone must be better than that of the analog interphone, and it can meet the needs of the modern private wireless communication. This paper studies the DCR digital interphone standard revised by the Japan Radio Industry Association in 2010. It adopts 4FSK modulation and demodulation mode and the symbol rate is 4.8kbps. it can communicate with voice and data at the same time. According to the modulation and demodulation system designed by DCR standard, the key theory of 4FSK frequency modulation and demodulation and 4FSK baseband signal processing is studied emphatically. Firstly, this paper introduces the theoretical scheme of 4FSK modulation and demodulation system based on DCR standard, expounds the basic principle of 4FSK modulation and demodulation, and introduces the theory of related baseband signal processing. The specific design scheme of DCR modulation and demodulation system is put forward, and the basic theory of baseband signal processing module in this system is designed and simulated. It mainly includes the design of ISINC filter and frame synchronization detector, and then simulates the 4FSK frequency modulation and demodulation scheme of RF module in DCR system, and analyzes the error rate curve of coherent demodulation and non-coherent demodulation algorithm. Then, the software radio platform of 4FSK modem in DCR system is built, and the design of CSD quantization coding of Fir filter is expatiated. Finally, the baseband modulation and demodulation system is implemented on the platform of the system. The hardware structure of DCR system platform is introduced. The main modules of the platform are tested and the test results are given.
【學(xué)位授予單位】：沈陽航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN915.05

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