本文選題：PEDS + 分集接收　； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：近年來,具有中國(guó)獨(dú)立知識(shí)產(chǎn)權(quán)的中國(guó)警用數(shù)字集群(Police Digital Trunking)標(biāo)準(zhǔn)的研發(fā)工作已經(jīng)圓滿結(jié)束。PDT警用數(shù)字集群標(biāo)準(zhǔn),是在我國(guó)公安主管單位帶領(lǐng)下,由中國(guó)國(guó)內(nèi)通信系統(tǒng)供應(yīng)商一起研究制定的數(shù)字專業(yè)無線通信技術(shù)標(biāo)準(zhǔn),它充分考慮了我國(guó)公安機(jī)關(guān)指揮調(diào)度的通信需求,同時(shí)還吸收了國(guó)際上比較成熟的標(biāo)準(zhǔn)協(xié)議的長(zhǎng)處,因此將成為我國(guó)公安通信領(lǐng)域的數(shù)字集群通信系統(tǒng)標(biāo)準(zhǔn)的發(fā)展方向。但是,由于PDT采用的是窄帶通信技術(shù),除了語音通信外,無法實(shí)現(xiàn)包括圖像在內(nèi)的高速數(shù)據(jù)傳輸,因此國(guó)內(nèi)現(xiàn)研究的PEDS(Police Enhanced Data Service)系統(tǒng)是用以由窄帶集群系統(tǒng)向?qū)拵Ъ合到y(tǒng)的演進(jìn)。本課題研究的是一種PEDS系統(tǒng)分集接收方法,并對(duì)分集接收算法進(jìn)行仿真驗(yàn)證和外場(chǎng)工程測(cè)試。本文首先對(duì)PDT系統(tǒng)進(jìn)行了簡(jiǎn)要的分析介紹,通過與現(xiàn)行的幾種數(shù)字集群技術(shù)的對(duì)比,分析了PDT系統(tǒng)的優(yōu)勢(shì)和不足,論證了PEDS系統(tǒng)的研究必要性。其次深入研究了無線信道特性和分集合并技術(shù)的基本原理,并根據(jù)PEDS的實(shí)際要求,通過比較傳統(tǒng)的分集合并方法,選擇空間分集和最大比合并的方法作為PEDS的分集合并技術(shù)。之后重點(diǎn)對(duì)分集接收方法,進(jìn)行了PEDS系統(tǒng)建模與仿真,并對(duì)多種分集合并方式、多種環(huán)境情況、多種信號(hào)類型的仿真結(jié)果進(jìn)行了對(duì)比,確定了最佳的分集合并接收方案。然后,根據(jù)系統(tǒng)實(shí)際要求,針對(duì)同步方式,提出了具體的解決方法,并優(yōu)化了匹配濾波同步的性能。最后,針對(duì)合并接收時(shí)相位調(diào)整的問題,根據(jù)鎖相環(huán)原理,提出了一種相位對(duì)齊的優(yōu)化方案,使得多個(gè)支路信號(hào)的合并效果得到提升。最后根據(jù)前面提出的分集接收算法和性能優(yōu)化,對(duì)PEDS系統(tǒng)的分集接收過程進(jìn)行了外場(chǎng)測(cè)試,同時(shí)將算法和優(yōu)化方案進(jìn)行了工程實(shí)踐,并從實(shí)踐中發(fā)現(xiàn)問題,解決問題。并根據(jù)其理論性能和實(shí)測(cè)結(jié)果的分析,可確定算法實(shí)現(xiàn)過程中的不足,并最終進(jìn)行了最優(yōu)化處理,達(dá)到了工程項(xiàng)目的應(yīng)用要求。
[Abstract]:In recent years, the research and development of the police digital trunking (Digital) standard, which has independent intellectual property rights in China, has been successfully completed. The digital professional wireless communication technology standard, which has been studied and formulated by domestic communication system suppliers in China, fully takes into account the communication needs of the command and dispatch of public security organs in China, and at the same time absorbs the advantages of more mature international standard protocols. Therefore, it will become the development direction of the digital trunking communication system standard in the field of public security communication. However, because PDT uses narrowband communication technology, it is impossible to realize high-speed data transmission, including images, except for voice communication. Therefore, the PEDS(Police Enhanced Data Service (PEDS(Police Enhanced Data Service) system is used to evolve from narrowband trunking system to broadband trunking system. In this paper, a diversity receiving method in PEDS system is studied, and the diversity receiving algorithm is verified by simulation and field engineering test. In this paper, firstly, the PDT system is briefly analyzed and introduced, and the advantages and disadvantages of PDT system are analyzed by comparing with several current digital trunking technologies, and the necessity of research on PEDS system is demonstrated. Secondly, the characteristics of wireless channel and the basic principle of diversity combination are deeply studied. According to the actual requirements of PEDS, the spatial diversity and maximum ratio combination are selected as the diversity merging techniques of PEDS by comparing the traditional diversity merging methods. After that, the PEDS system modeling and simulation are focused on, and the simulation results of multiple diversity merging methods, environment and signal types are compared, and the optimal diversity merge reception scheme is determined. Then, according to the actual requirements of the system, a specific solution is proposed for the synchronization mode, and the performance of matched filtering synchronization is optimized. Finally, according to the principle of phase-locked loop, a phase alignment optimization scheme is proposed to improve the combination effect of multiple branch signals. Finally, according to the diversity receiving algorithm and performance optimization proposed above, the field test of diversity receiving process in PEDS system is carried out. At the same time, the algorithm and optimization scheme are carried out in engineering practice, and the problems are found and solved from the practice. Based on the analysis of the theoretical performance and the measured results, the shortcomings of the algorithm can be determined, and the optimization treatment is finally carried out, which meets the requirements of the engineering project.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN929.52

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本文編號(hào)：1786440