發(fā)布時(shí)間：2019-02-23 23:21

【摘要】：矢量信號(hào)源作為通信系統(tǒng)中最重要的測試儀器之一,常常被用在數(shù)字通信的測試中,其本身的性能指標(biāo)是決定測試準(zhǔn)確性的重要因素。隨著科學(xué)技術(shù)的突飛猛進(jìn),數(shù)字通信系統(tǒng)的性能得到了很大的提升,因而對(duì)源的精確性和多樣性有了更高的需求。如何產(chǎn)生寬帶正交的調(diào)制信號(hào),是矢量信號(hào)源研究的關(guān)鍵問題,也是電子信息相關(guān)領(lǐng)域快速發(fā)展后對(duì)新一代的矢量信號(hào)源提出的要求。本文即在此背景下,對(duì)數(shù)字信號(hào)處理和通信技術(shù)方面的相關(guān)理論進(jìn)行分析和研究后,重點(diǎn)針對(duì)矢量信號(hào)源中的基帶部分進(jìn)行設(shè)計(jì)。系統(tǒng)采用了軟件無線電(SDR)的設(shè)計(jì)思路,使用可編程邏輯門陣列(FPGA)作為通用的硬件平臺(tái),并在此平臺(tái)上構(gòu)建可配置的基帶模塊,產(chǎn)生通用的寬帶數(shù)字調(diào)制基帶信號(hào),并將該基帶信號(hào)正交混頻至所需的載頻上。經(jīng)過測試驗(yàn)證,設(shè)計(jì)完成的調(diào)制信號(hào)源可以正確產(chǎn)生FSK、PSK、QAM等多種通用的數(shù)字調(diào)制信號(hào)。系統(tǒng)基帶數(shù)據(jù)碼率從1Ksps至20Msps之間連續(xù)可調(diào),產(chǎn)生的調(diào)制信號(hào)質(zhì)量良好,滿足設(shè)計(jì)要求。本設(shè)計(jì)的主要工作包括:系統(tǒng)時(shí)鐘方案的設(shè)計(jì)。本文采用DDS產(chǎn)生頻率可調(diào)的參考時(shí)鐘信號(hào),然后結(jié)合FPGA內(nèi)部的鎖相環(huán)產(chǎn)生一組相關(guān)的時(shí)鐘。整個(gè)系統(tǒng)基于這些時(shí)鐘進(jìn)行設(shè)計(jì),通過調(diào)整參考時(shí)鐘的頻率和鎖相環(huán)的分頻比得到連續(xù)可調(diào)的時(shí)鐘,進(jìn)而得到碼率連續(xù)可調(diào)的基帶信號(hào)�；鶐盘�(hào)生成模塊的設(shè)計(jì)�；鶐�(shù)據(jù)采用M序列進(jìn)行模擬,然后對(duì)數(shù)據(jù)進(jìn)行編碼映射、成型濾波和可變插值。其中成型濾波器單元采用參數(shù)集的方法進(jìn)行設(shè)計(jì),使成型濾波器的類型和參數(shù)可以動(dòng)態(tài)配置,可變插值部分采用半帶濾波器和CIC濾波器組合的方式進(jìn)行設(shè)計(jì),實(shí)現(xiàn)可調(diào)節(jié)的插值倍數(shù)。上變頻部分的設(shè)計(jì)。主要由數(shù)字的正交混頻和模擬的正交混頻兩部分構(gòu)成。模擬正交混頻將基帶搬移至100MHz~3GHz的載頻上,而在雙通道的設(shè)計(jì)中,數(shù)字正交混頻為信道提供合適的頻率偏移。
[Abstract]:As one of the most important testing instruments in communication system, vector signal source is often used in the test of digital communication. Its performance index is an important factor to determine the accuracy of the test. With the rapid development of science and technology, the performance of digital communication systems has been greatly improved, so there is a higher demand for the accuracy and diversity of sources. How to produce wide-band quadrature modulated signal is a key problem in the research of vector signal source, and it is also the requirement of the new generation vector signal source after the rapid development of electronic information related field. Under this background, this paper analyzes and studies the related theories of digital signal processing and communication technology, and focuses on the design of the baseband part of the vector signal source. The system adopts the design idea of software radio (SDR), uses programmable logic gate array (FPGA) as the general hardware platform, and constructs the configurable baseband module on this platform to produce the general broadband digital modulation baseband signal. The base band signal is orthogonal mixed to the desired carrier frequency. It is proved by test that the designed modulation signal source can produce many kinds of general digital modulation signals such as FSK,PSK,QAM correctly. The baseband data rate of the system can be adjusted continuously from 1Ksps to 20Msps. The modulation signal produced is of good quality and meets the design requirements. The main work of this design includes: the design of system clock scheme. In this paper, DDS is used to generate a reference clock signal with adjustable frequency, and then a set of related clocks is generated by combining the phase-locked loop inside the FPGA. The whole system is designed on the basis of these clocks. By adjusting the frequency of the reference clock and the frequency division ratio of the phase-locked loop, the continuously adjustable clock is obtained, and then the continuously adjustable baseband signal is obtained. Design of baseband signal generation module. The baseband data is simulated by M sequence, then encoded by mapping, shaping filtering and variable interpolation. The shaping filter unit is designed by the method of parameter set, so that the type and parameters of the shaping filter can be dynamically configured, and the variable interpolation part is designed by the combination of half-band filter and CIC filter. Realize adjustable interpolation multiple. The design of upconversion part. It is mainly composed of digital orthogonal mixing and analog orthogonal mixing. The analog orthogonal mixing moves the baseband to the carrier frequency of the 100MHz~3GHz. In the design of two channels, the digital orthogonal mixing provides the appropriate frequency offset for the channel.
【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】：2017
【分類號(hào)】：TN911.3

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