發(fā)布時間：2018-04-24 08:15

  本文選題：DPMR + CRC��； 參考：《西安電子科技大學》2014年碩士論文

【摘要】：DPMR(Digital Private Mobile Radio)系統(tǒng)協(xié)議是歐洲電信標準協(xié)會(ETSI)發(fā)布的最新的專業(yè)數(shù)字移動通信標準。作為新一代數(shù)字通信系統(tǒng),DPMR支持多種業(yè)務(wù),應(yīng)用范圍廣泛,適用于商業(yè)、專業(yè)和公共安全用戶。在數(shù)字對講機的研究,生產(chǎn),維護過程中,必須要對其進行相關(guān)測試以確保其性能的可靠性。歐美發(fā)達國家早已研究出基于DPMR協(xié)議的對講機測試系統(tǒng),但其價格較高而且在公共安全方面有一定限制。由于我國對專業(yè)數(shù)字移動通信測試的研究起步較晚,目前我國還沒有與此相關(guān)的測試儀器。本課題正基于這樣的大背景產(chǎn)生,希望通過對DPMR協(xié)議的研究實現(xiàn)基于該協(xié)議的無中心數(shù)字對講機性能的測試。使其符合實際產(chǎn)品的開發(fā)要求并為今后無中心數(shù)字對講機通信協(xié)議的改進和升級提供參考與指導。本文首先介紹了數(shù)字對講機的前景分析以及國內(nèi)外研究現(xiàn)狀和DPMR協(xié)議的優(yōu)勢。其次,論文對DPMR協(xié)議的核心模塊進行了論述,對數(shù)據(jù)鏈路層用到的各種幀結(jié)構(gòu)和其功能的設(shè)定進行了詳細論述,并對通信信令的格式以及其取值進行了說明。此外,還介紹了協(xié)議中的各種信道接入規(guī)則。再次,比較詳細地分析了DPMR協(xié)議中用到的各種編碼,比如CRC校驗,漢明編碼,交織和擾碼。并且給出了逐一給出了算法的原理以及具體實現(xiàn)過程。還給出了DPMR協(xié)議中各種幀的具體實現(xiàn)方式。然后,論文又系統(tǒng)介紹了DPMR協(xié)議中調(diào)制解調(diào)所用到的FIR濾波器設(shè)計,并采用Matlab進行了仿真設(shè)計,又詳細介紹了DPMR協(xié)議中的用到的4FSK調(diào)制解調(diào)技術(shù),并給出了產(chǎn)生方式以及解調(diào)的辦法。最后,論文給出了相關(guān)的硬件實現(xiàn),具體介紹了采用NIOS搭建硬件平臺的過程,并給出了基帶信號的測試結(jié)果。文中重點論述了協(xié)議中各種幀的形成過程,詳細論述了編解碼中的各種關(guān)鍵技術(shù)的具體實現(xiàn)算法,以及調(diào)制解調(diào)中的濾波器設(shè)計和4FSK調(diào)制與解調(diào)算法,并搭建了硬件平臺,在硬件平臺上進行了相關(guān)測試,給出了測試結(jié)果。
[Abstract]:The DPMR(Digital Private Mobile RadioProtocol is the latest professional digital mobile communication standard issued by the European Telecommunication Standards Association. As a new generation digital communication system, DPMR supports a wide range of services and is suitable for commercial, professional and public security users. In the research, production and maintenance of digital interphone, it must be tested to ensure the reliability of its performance. Interphone testing system based on DPMR protocol has been developed in developed countries of Europe and America, but its price is high and there are some limitations in public safety. Due to the late start of the research on the professional digital mobile communication in China, there are no related testing instruments in China. This paper is based on this background and hopes to test the performance of the centerless digital walkie-talkie based on the DPMR protocol. It can meet the requirements of the actual product development and provide reference and guidance for the improvement and upgrading of the digital interphone communication protocol without center in the future. This paper first introduces the foreground analysis of digital interphone, the research status at home and abroad and the advantages of DPMR protocol. Secondly, the core module of DPMR protocol is discussed in this paper, the frame structure and function of data link layer are discussed in detail, and the format of communication signaling and its value are explained. In addition, various channel access rules in the protocol are also introduced. Thirdly, various kinds of codes used in DPMR protocol, such as CRC check, hamming coding, interleaving and scrambling, are analyzed in detail. The principle and realization process of the algorithm are given one by one. The implementation of various frames in DPMR protocol is also given. Then, the paper systematically introduces the design of FIR filter used in modulation and demodulation in DPMR protocol, and uses Matlab to carry on simulation design, and introduces the 4FSK modulation and demodulation technology used in DPMR protocol in detail. The generation method and demodulation method are also given. Finally, the paper gives the related hardware implementation, introduces the process of using NIOS to build the hardware platform, and gives the test results of baseband signal. This paper focuses on the formation process of various frames in the protocol, discusses in detail the realization algorithms of various key technologies in coding and decoding, the filter design and 4FSK modulation and demodulation algorithm in modulation and demodulation, and builds a hardware platform. The related tests are carried out on the hardware platform, and the test results are given.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.54

【參考文獻】

相關(guān)碩士學位論文 前1條

1 鐘烈;基于DMR的4CPFSK基帶信號處理技術(shù)研究和芯片設(shè)計實現(xiàn)[D];浙江大學;2012年

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本文編號：1795852