【摘要】：隨著移動通信的發(fā)展,移動通信發(fā)展至現(xiàn)在的4G階段并正在向5G邁進(jìn),專用無線通信也到了從模擬通信過渡到數(shù)字通信的階段。數(shù)字專業(yè)無線通信系統(tǒng)能夠提供更清晰的語音質(zhì)量、更遠(yuǎn)的通信覆蓋、更快的接通速度、更靈活的產(chǎn)品功能。目前,比較成熟的技術(shù)有TETRA系統(tǒng)和iDEN系統(tǒng),但這兩項技術(shù)的實現(xiàn)成本比較高,且專利比較多,直接對其開發(fā)比較麻煩。2005年歐洲電信標(biāo)準(zhǔn)協(xié)會(ETSI)提出了DMR標(biāo)準(zhǔn)。DMR標(biāo)準(zhǔn)主要適用于中低端的專用數(shù)字無線通信,技術(shù)實現(xiàn)簡單,能兼容專用無線通信的模擬設(shè)備。近些年來DMR標(biāo)準(zhǔn)受到了越來越多的關(guān)注,目前市場上已經(jīng)出現(xiàn)了采用DMR標(biāo)準(zhǔn)的數(shù)字對講機(jī)產(chǎn)品。本文中首先介紹了數(shù)字對講機(jī)在我國的發(fā)展近況,對市面上出現(xiàn)的各種數(shù)字對講機(jī)的產(chǎn)品進(jìn)行了對比及分析,得出其中最具發(fā)展?jié)摿�、且得到國�?nèi)大多企業(yè)認(rèn)可的就是DMR數(shù)字對講機(jī)。之后本文詳細(xì)介紹了DMR協(xié)議的基本內(nèi)容,簡單的描述了本文涉及到的DMR空中接口協(xié)議中的幀格式、信令、信道、與其他網(wǎng)絡(luò)的通信等內(nèi)容。對于只有一個中轉(zhuǎn)設(shè)備的小型專業(yè)無線系統(tǒng),本文對其性能進(jìn)行了分析,得出了呼損率,話務(wù)量等性能之間的關(guān)系。最后對4個單工信道和2個雙工信道的情況分別進(jìn)行了愛爾蘭呼損率的仿真。本文重點研究了DMR轉(zhuǎn)發(fā)階段中中轉(zhuǎn)臺的軟件設(shè)計開發(fā)。詳細(xì)分析了各個信令在中轉(zhuǎn)臺中的處理流程,中轉(zhuǎn)臺高層狀態(tài)的轉(zhuǎn)換,中轉(zhuǎn)臺中緩存的設(shè)計方案及可行性分析,最終設(shè)計出了中轉(zhuǎn)臺上DMR呼叫控制層協(xié)議的完整方案。然后在linux操作系統(tǒng)下,運行設(shè)計并編寫好的軟件,分單工和雙工2種情況分別對實驗過程中得出的結(jié)果進(jìn)行分析,發(fā)現(xiàn)設(shè)計出的中轉(zhuǎn)發(fā)程序能正確的將源對講機(jī)端機(jī)發(fā)送的消息轉(zhuǎn)發(fā)給目的對講機(jī)端機(jī),且語音清晰。最后,本文對本次項目中第一階段的工作做了簡單的總結(jié)。簡單介紹了在DMR第一階段中所做的工作內(nèi)容,然后分別對鍵盤,LCD顯示屏和寫頻軟件進(jìn)行了介紹,并展示了其實驗結(jié)果。
[Abstract]:With the development of mobile communication, mobile communication has developed to 4G stage and is moving towards 5G, and private wireless communication has also reached the stage of transition from analog communication to digital communication. Digital professional wireless communication system can provide clearer voice quality, farther communication coverage, faster connection speed and more flexible product functions. At present, the more mature technologies are TETRA system and iDEN system, but the implementation cost of these two technologies is relatively high, and there are many patents, so it is troublesome to develop them directly. In 2005, the European Telecommunications Standards Association (ETSI) put forward the DMR standard. DMR standard is mainly suitable for special digital wireless communication at the middle and low end, and the technology implementation is simple and compatible with the analog equipment of special wireless communication. In recent years, more and more attention has been paid to DMR standard. At present, digital interphone products using DMR standard have appeared in the market. In this paper, the development of digital interphone in China is introduced, and the products of all kinds of digital interphone in the market are compared and analyzed, and it is concluded that DMR digital interphone is the most potential and recognized by most domestic enterprises. Then this paper introduces the basic content of DMR protocol in detail, and briefly describes the frame format, signaling, channel, communication with other networks and so on in the DMR air interface protocol involved in this paper. For a small professional wireless system with only one transit device, the performance of the system is analyzed in this paper, and the relationship between call loss rate, traffic volume and other performance is obtained. Finally, the Irish call loss rates are simulated for four single channels and two duplex channels, respectively. This paper focuses on the software design and development of DMR forwarding stage transit platform. The processing flow of each signaling in the transit platform, the transition of the high level state of the transit station, the design scheme and feasibility analysis of the cache in the transit platform are analyzed in detail. Finally, the complete scheme of DMR call control layer protocol on the transit platform is designed. Then, under the linux operating system, the designed software is run and written, and the results obtained in the experimental process are analyzed in two cases: simplex and duplex. It is found that the designed middle forwarding program can correctly forward the message sent by the source intercom to the target intercom, and the voice is clear. Finally, this paper makes a brief summary of the first stage of the project. This paper briefly introduces the work done in the first stage of DMR, then introduces the keyboard, LCD display screen and writing frequency software respectively, and shows the experimental results.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.5

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