本文關(guān)鍵詞：矢量信號(hào)分析軟件設(shè)計(jì)　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 矢量信號(hào)分析 數(shù)字解調(diào) 誤差矢量(EVM) 軟件設(shè)計(jì)

【摘要】：在現(xiàn)代無(wú)線通信網(wǎng)絡(luò)中,數(shù)字傳輸方式因其在頻譜利用率和抗干擾方面的優(yōu)勢(shì),已經(jīng)成為通信領(lǐng)域普遍采用的傳輸方式。隨之而來(lái)的是對(duì)各種數(shù)字調(diào)制信號(hào)分析的迫切需求。其中,矢量信號(hào)分析方法已經(jīng)成為各種數(shù)字調(diào)制信號(hào)測(cè)試分析的主要方法,矢量信號(hào)分析是通信技術(shù)發(fā)展的重要基礎(chǔ)。目前,矢量信號(hào)分析大多基于軟件無(wú)線電的思想展開(kāi),用軟件的方式來(lái)處理矢量信號(hào)分析已經(jīng)成為一個(gè)大的趨勢(shì)。因此,調(diào)制信號(hào)處理算法及相應(yīng)的軟件設(shè)計(jì)在矢量信號(hào)分析中越來(lái)越重要。本論文針對(duì)上述需求及發(fā)展趨勢(shì),以ASK、FSK和QPSK等數(shù)字調(diào)制信號(hào)的調(diào)制質(zhì)量分析軟件設(shè)計(jì)為研究對(duì)象。在深入的分析了當(dāng)前國(guó)內(nèi)外矢量信號(hào)分析儀發(fā)展現(xiàn)狀的基礎(chǔ)上,提出了一種低成本、高性價(jià)比的基于軟件無(wú)線電的矢量信號(hào)分析解決方案。該方案以低成本的中頻數(shù)據(jù)采集硬件平臺(tái)為數(shù)據(jù)采集前端,利用數(shù)字正交解調(diào)方法來(lái)實(shí)現(xiàn)矢量信號(hào)的解調(diào),以開(kāi)環(huán)前向的載波頻偏和相位聯(lián)合估計(jì)算法來(lái)實(shí)現(xiàn)載波同步,以開(kāi)環(huán)前向的定時(shí)相位估計(jì)算法來(lái)實(shí)現(xiàn)解調(diào)過(guò)程中的定時(shí)恢復(fù)。從而,對(duì)數(shù)字調(diào)制信號(hào)進(jìn)行解調(diào)和判決,最終獲得解調(diào)比特流。最后,根據(jù)誤差矢量理論,利用解調(diào)結(jié)果產(chǎn)生參考信號(hào),將參考信號(hào)與I/Q兩路信號(hào)進(jìn)行比較分析與計(jì)算,獲得該數(shù)字調(diào)制信號(hào)的誤差矢量幅度(EVM)、幅度誤差以及相位誤差等參數(shù)的統(tǒng)計(jì)結(jié)果以及星座圖等描述數(shù)字調(diào)制信號(hào)調(diào)制質(zhì)量的指標(biāo)。在上述理論及算法研究的基礎(chǔ)上,結(jié)合自動(dòng)測(cè)試系統(tǒng)(ATS)設(shè)計(jì)的方法。利用程控儀器或者DAQ(數(shù)據(jù)采集板卡)作為前端數(shù)據(jù)采集的設(shè)備,與計(jì)算機(jī)組成自動(dòng)測(cè)試系統(tǒng)的硬件平臺(tái)。利用Labwindows/CVI這個(gè)測(cè)試軟件開(kāi)發(fā)平臺(tái)進(jìn)行矢量信號(hào)分析系統(tǒng)軟件的設(shè)計(jì)和實(shí)現(xiàn),最終組建成自動(dòng)測(cè)試系統(tǒng)。在軟件設(shè)計(jì)的過(guò)程中,遵循標(biāo)準(zhǔn)的軟件開(kāi)發(fā)流程,通過(guò)需求分析、軟件體系結(jié)構(gòu)設(shè)計(jì)、軟件模塊設(shè)計(jì)、數(shù)據(jù)處理和算法設(shè)計(jì)以及最后的系統(tǒng)調(diào)試,完成了系統(tǒng)軟件的開(kāi)發(fā)和測(cè)試系統(tǒng)的組建工作。
[Abstract]:In modern wireless communication networks, digital transmission mode has advantages in spectrum efficiency and anti-jamming. It has been widely used in the field of communication, followed by the urgent need for the analysis of various digital modulation signals. Vector signal analysis method has become the main method of digital modulation signal test and analysis. Vector signal analysis is an important basis for the development of communication technology. Vector signal analysis is mostly based on the idea of software radio. It has become a big trend to process vector signal by software. Modulation signal processing algorithm and corresponding software design are more and more important in vector signal analysis. This paper aims at the above requirements and development trend, using ASK. The software design of modulation quality analysis of digital modulation signals such as FSK and QPSK is studied. Based on the in-depth analysis of the current situation of vector signal analyzer at home and abroad, a low cost is proposed. The solution of vector signal analysis based on software radio with high performance and price ratio, which takes the low cost if data acquisition hardware platform as the front end of data acquisition. The digital quadrature demodulation method is used to demodulate the vector signal, and the open-loop forward carrier frequency offset and phase joint estimation algorithm is used to realize carrier synchronization. The open-loop forward timing phase estimation algorithm is used to realize the timing recovery in the demodulation process. Thus, the digital modulation signal is demodulated and determined, and finally the demodulated bit stream is obtained. Finally, according to the error vector theory. The reference signal is generated by the demodulation result, and the error vector amplitude of the digital modulation signal is obtained by comparing the reference signal with the I / Q signal. The statistical results of amplitude error and phase error and constellation diagram are used to describe the modulation quality of digital modulation signal. Combining with the design method of automatic test system (ATS), the program control instrument or DAQ (data acquisition board) is used as the front-end data acquisition equipment. The software of vector signal analysis system is designed and implemented by using Labwindows/CVI, which is a testing software development platform. In the process of software design, follow the standard software development process, through requirements analysis, software architecture design, software module design. Data processing, algorithm design and the final system debugging, completed the development of the system software and the establishment of the test system.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM935

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本文編號(hào)：1420259