【摘要】：PDT協(xié)議標(biāo)準(zhǔn)是我國具有自主知識產(chǎn)權(quán)的集群通信系統(tǒng),主要應(yīng)用于公安無線通信的安全加密和全國聯(lián)網(wǎng)的數(shù)字化建設(shè)中,向下兼容歐洲電信化標(biāo)準(zhǔn)的DMR標(biāo)準(zhǔn),基于PDT協(xié)議的對講機(jī)產(chǎn)品已經(jīng)有國內(nèi)廠商生產(chǎn)研發(fā),但是對于PDT數(shù)字信號的測試儀還沒有國內(nèi)廠商研制,因此本項(xiàng)目主要研究PDT數(shù)字對講機(jī)的信號測試,包括調(diào)制誤差、符號偏移、幅度誤差與誤碼率的測試。為了更好的實(shí)現(xiàn)PDT數(shù)字對講機(jī)的各個模塊的測試,需產(chǎn)生PDT數(shù)字基帶測試信號,本文主要完成PDT信號的形成和信號的分析。本文主要基于整個項(xiàng)目架構(gòu)中的數(shù)據(jù)鏈路層部分,對測試序列的形成、發(fā)送以及接收分析的整個流程基于軟件實(shí)現(xiàn),涉及信道編解碼、調(diào)制解調(diào)及誤碼率測試分析。首先通過對通信標(biāo)準(zhǔn)和對講機(jī)測試技術(shù)的研究,引出課題研究的工程實(shí)踐價值與意義,然后對PDT通信協(xié)議三層架構(gòu)進(jìn)行了分析介紹,涵蓋了PDT信號測試中所涉及的通信幀結(jié)構(gòu)與信令結(jié)構(gòu)、同步與時序、呼叫協(xié)議中的呼叫流程和4FSK調(diào)制的原理。論文研究的主體是數(shù)據(jù)傳輸中的信道編碼算法與信道解碼算法,通過對信號進(jìn)行校驗(yàn)編碼保護(hù),保證通信傳輸?shù)目煽啃?為測試PDT測試指標(biāo)誤碼率提供理論基礎(chǔ)。編解碼算法的是軟件具體實(shí)現(xiàn)的核心算法部分,主要完成了三項(xiàng)關(guān)鍵工作,一是對于PDT協(xié)議中使用最為廣泛的BPTC編碼作了譯碼順序的研究,針對可能出現(xiàn)的不能正確譯碼情況進(jìn)行譯碼順序說明;二是對于EMB校驗(yàn)中所用的二次剩余碼的錯誤圖樣多項(xiàng)式進(jìn)行求解分析與公式說明,并改進(jìn)捕獲譯碼算法來滿足譯碼需求;三是對數(shù)據(jù)幀中的數(shù)據(jù)類型部分進(jìn)行校驗(yàn)的Golay碼,比較分析八種不同的譯碼方法,選擇基于伴隨式權(quán)重的譯碼算法,完成譯碼需求。通過分析各種譯碼的性能、算法復(fù)雜度和資源消耗,選擇適合項(xiàng)目開發(fā)的譯碼算法,并給出具體的譯碼步驟、軟件實(shí)現(xiàn)過程和仿真。最后,設(shè)計(jì)實(shí)現(xiàn)了直通模式下PDT數(shù)據(jù)鏈路層軟件結(jié)構(gòu),完成了信道編解碼軟件,并進(jìn)行了誤碼率仿真,以及BPTC碼、二次剩余碼和Golay碼的編解碼測試仿真,分析信道編碼的糾錯性能及在通信中的作用。因此本文的研究成果可以為后續(xù)硬件實(shí)現(xiàn)和點(diǎn)對點(diǎn)的實(shí)際通信性能測試提供理論支持。
[Abstract]:PDT protocol standard is a trunking communication system with independent intellectual property rights in our country. It is mainly used in the security encryption of public security wireless communication and the digital construction of the national network, and it is compatible with the DMR standard of European telecommunication standard downwards. The interphone products based on PDT protocol have already been produced and developed by domestic manufacturers. However, no domestic manufacturer has developed the testing instrument for PDT digital signal, so this project mainly studies the signal testing of PDT digital interphone, including modulation error. Symbol offset, amplitude error and bit error rate testing. In order to better realize the test of each module of PDT digital interphone, it is necessary to produce the PDT digital baseband test signal. This paper mainly completes the formation of PDT signal and the analysis of PDT signal. This paper is mainly based on the data link layer part of the whole project architecture. The whole process of test sequence formation, transmission and reception analysis is based on software implementation, including channel coding and decoding, modulation and demodulation, and bit error rate test and analysis. Firstly, through the research of communication standard and interphone testing technology, the engineering practice value and significance of the research are introduced, and then the three-layer structure of PDT communication protocol is analyzed and introduced. It covers the structure of communication frame and signaling, synchronization and timing, call flow in call protocol and the principle of 4FSK modulation in PDT signal testing. The main body of this paper is the channel coding algorithm and channel decoding algorithm in data transmission. By verifying and coding the signal to ensure the reliability of communication transmission, it provides a theoretical basis for testing the error rate of PDT test index. The coding and decoding algorithm is the core part of the software implementation, which mainly completes three key tasks. First, the decoding sequence of the most widely used BPTC code in PDT protocol is studied. The order of decoding is explained in view of the possible incorrect decoding, the second is to solve and analyze the error pattern polynomial of the quadratic residual code used in EMB check, and to improve the acquisition and decoding algorithm to meet the decoding requirements. The third is Golay code which is used to verify the data type part of the data frame. Eight different decoding methods are compared and analyzed. The decoding algorithm based on the adjoint weight is selected to complete the decoding requirements. By analyzing the performance, complexity and resource consumption of various decoding algorithms, the decoding algorithm suitable for project development is selected, and the detailed decoding steps, software implementation process and simulation are given. Finally, the PDT data link layer software structure is designed and implemented, the channel coding and decoding software is completed, and the error rate simulation, as well as the coding and decoding test simulation of BPTC code, secondary residue code and Golay code, are carried out. The error correction performance of channel coding and its role in communication are analyzed. Therefore, the research results in this paper can provide theoretical support for subsequent hardware implementation and point-to-point communication performance testing.
【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】：TN929.54

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