本文選題：多體制基帶信號　切入點(diǎn)：軟件無線電　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：矢量信號源在當(dāng)今通信系統(tǒng)的測試儀器中占有非常重要的位置,常用于數(shù)字通信接收設(shè)備的測試與檢驗�？茖W(xué)技術(shù)的發(fā)展與工藝的提高,系統(tǒng)性能得到很大提升,隨之帶來的問題是需要精度更高、功能更多的儀器來測試,而原有的信號發(fā)生器的性能顯然已不能滿足工業(yè)測試計量的需求。在此背景下,需要對數(shù)字基帶信號發(fā)生技術(shù)再次進(jìn)行深入研究,并設(shè)計出能夠提供多體制、大帶寬數(shù)字調(diào)制的基帶信號發(fā)生器,以滿足未來工業(yè)發(fā)展的需求和新一代矢量信號源的要求。本論文是以PXI矢量信號源項目為研究背景,著重研究了多體制通信基帶信號產(chǎn)生及處理的相關(guān)理論和設(shè)計方法�？傮w方案是基于軟件無線電的思想,以DSP+FPGA為硬件實(shí)現(xiàn)平臺,經(jīng)過設(shè)計與仿真驗證,產(chǎn)生符合指標(biāo)要求的多體制通信基帶信號。本文研究的主要內(nèi)容有:1、成型濾波單元設(shè)計。優(yōu)化設(shè)計方案,通過實(shí)現(xiàn)成型濾波器的類型可選及參數(shù)可控等,降低設(shè)計的復(fù)雜度。采用DSP和FPGA相結(jié)合的設(shè)計方案,DSP負(fù)責(zé)系數(shù)計算與重配,而FPGA負(fù)責(zé)系數(shù)正確導(dǎo)入濾波器,從而完成成型濾波器系數(shù)的在線重載設(shè)計,實(shí)現(xiàn)了脈沖信號的成型濾波;2、變速率信號處理單元設(shè)計�；诙嗨俾市盘柼幚砝碚�,采用FIR+CIC的插值補(bǔ)償濾波器的設(shè)計方案,通過編寫程序與仿真測試,其結(jié)果實(shí)現(xiàn)了變速率基帶信號處理,同時也抑制了采樣時鐘帶來的鏡像失真;3、多普勒頻移模擬單元設(shè)計。這部分的研究內(nèi)容是為了適應(yīng)新一代信號發(fā)生器對高動態(tài)目標(biāo)信號模擬的需求。本設(shè)計是在信號發(fā)生器基礎(chǔ)上,基于直接數(shù)字頻率合成技術(shù)(DDS),產(chǎn)生多普勒頻移信號,實(shí)現(xiàn)對運(yùn)動目標(biāo)的動態(tài)模擬。以上是本論文研究的主要內(nèi)容,通過對相關(guān)理論的研究與分析,以矢量信號調(diào)制技術(shù)為基礎(chǔ),基于軟件無線電思想,用可編程邏輯器件(FPGA)構(gòu)建了一個具有開放性、標(biāo)準(zhǔn)化、模塊化的通用硬件平臺進(jìn)行方案設(shè)計與實(shí)現(xiàn),最終產(chǎn)生符合指標(biāo)要求的多體制通信基帶信號。
[Abstract]:The vector signal source occupies a very important position in the test instrument of the communication system nowadays. It is often used in the test and test of the digital communication receiving equipment. With the development of science and technology and the improvement of the technology, the performance of the system has been greatly improved. The resulting problem is that more accurate and more functional instruments are needed to test, and the performance of the original signal generator is obviously no longer able to meet the needs of industrial test metering. The technology of digital baseband signal generation needs to be further studied, and a baseband signal generator which can provide multi-system and large bandwidth digital modulation is designed. In order to meet the needs of the future industrial development and the requirements of the new generation vector signal source, this paper takes the PXI vector signal source project as the research background. This paper focuses on the related theory and design method of baseband signal generation and processing in multi-system communication. The overall scheme is based on the idea of software radio, using DSP FPGA as hardware implementation platform, and verified by design and simulation. The main contents of this paper are: 1: 1, design of shaping filter unit, optimization of design scheme, realization of type selection of shaping filter and controllable parameters, etc. In order to reduce the complexity of the design, the DSP and FPGA are used to calculate and rematch the coefficients, while the FPGA is responsible for the correct input of the coefficients into the filter, so as to complete the on-line heavy load design of the shaping filter coefficients. The design of pulse signal shaping filter and variable rate signal processing unit is realized. Based on the theory of multi-rate signal processing, the design scheme of interpolation compensation filter based on FIR CIC is adopted. The results show that variable rate baseband signal processing is realized. At the same time, the mirror distortion caused by the sampling clock is suppressed, and the Doppler frequency shift analog unit is designed. The purpose of this research is to meet the demand of the new generation signal generator for high dynamic target signal simulation. Based on the signal generator, Based on the direct digital frequency synthesizer (DDS) technique, Doppler frequency shift signal is generated and the dynamic simulation of moving target is realized. The above is the main content of this paper. Through the research and analysis of related theory, it is based on vector signal modulation technology. Based on the idea of software radio, a general hardware platform with openness, standardization and modularization is constructed with programmable logic device (FPGA) to design and implement the scheme. Finally, a multi-system communication baseband signal that meets the requirements of the index is generated.
【學(xué)位授予單位】：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】：TN911.7

【共引文獻(xiàn)】

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