本文關(guān)鍵詞：射頻直接采樣技術(shù)的同軸線信號(hào)傳輸平臺(tái)研究與實(shí)現(xiàn)　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： 同軸接入 軟件無線電 射頻直接采樣 高速數(shù)模混合電路

【摘要】：隨著電信網(wǎng)、廣播電視網(wǎng)和互聯(lián)網(wǎng)三網(wǎng)融合技術(shù)的普及和發(fā)展,如何快速推進(jìn)有線廣播電視網(wǎng)向數(shù)據(jù)化、雙向化改造,構(gòu)建新型接入網(wǎng)成為下一代廣播電視網(wǎng)改造面臨的主要機(jī)遇和挑戰(zhàn)。目前有線電視網(wǎng)的同軸線接入技術(shù)大多采用1024QAM-OFDMA調(diào)制模式,能夠提供的頻譜利用率為7bps/Hz,整體的物理層數(shù)據(jù)率為百兆量級,嚴(yán)重制約著高清數(shù)字視頻、寬帶數(shù)據(jù)接入等業(yè)務(wù)的開展。而且現(xiàn)有接入技術(shù)大多固定發(fā)射接收頻點(diǎn),不利于系統(tǒng)對于復(fù)雜場景的適應(yīng)。針對以上實(shí)際問題,論文在EPoC標(biāo)準(zhǔn)的基礎(chǔ)上,運(yùn)用軟件無線電技術(shù)的思想,研究并設(shè)計(jì)了射頻直接采樣技術(shù)的同軸線信號(hào)傳輸平臺(tái)。首先,針對EPoC的4096QAM-OFDMA調(diào)制模式的核心組網(wǎng)技術(shù)進(jìn)行研究并將接入網(wǎng)場景抽象成實(shí)驗(yàn)室測試環(huán)境。同時(shí)對比了經(jīng)典的采樣技術(shù)和軟件無線電技術(shù)的典型實(shí)現(xiàn)方法。接著,對射頻直接采樣技術(shù)進(jìn)行了研究,特別是ADC的雙沿采樣技術(shù)和DAC的多頻率響應(yīng)輸出技術(shù)。研究并實(shí)現(xiàn)了一套基于射頻直接采樣技術(shù)的同軸線信號(hào)傳輸平臺(tái),滿足信號(hào)帶寬及子信道數(shù)可配,中心頻點(diǎn)在5~1536MHz范圍內(nèi)可調(diào),數(shù)字系統(tǒng)回環(huán)SNR大于44dB。最后,實(shí)驗(yàn)室環(huán)境下模擬搭建實(shí)際組網(wǎng)場景并進(jìn)行測試,實(shí)現(xiàn)數(shù)字鏈路回環(huán)EVM小于0.7%,經(jīng)過100m同軸線分配網(wǎng)絡(luò)的全鏈路回環(huán)EVM小于1%,在FDD模式下實(shí)現(xiàn)4096QAM-OFDMA信號(hào)傳輸,滿足設(shè)計(jì)需求。論文設(shè)計(jì)并實(shí)現(xiàn)了射頻直接采樣技術(shù)的同軸信號(hào)傳輸平臺(tái)方案,通過對系統(tǒng)各項(xiàng)功能和性能的測試,驗(yàn)證其可行性。該方案已用于新的EPoC標(biāo)準(zhǔn)預(yù)研,為我國三網(wǎng)融合接入網(wǎng)技術(shù)的研究增添動(dòng)力。
[Abstract]:With the popularization and development of telecommunication network, radio and television network and Internet integration technology, how to quickly promote the cable radio and television network to data, two-way transformation. Construction of a new access network has become the main opportunity and challenge for the next generation radio and television network transformation. At present, the coaxial access technology of cable television network mostly adopts 1024QAM-OFDMA modulation mode. The spectrum efficiency can be 7 BP / Hz and the whole physical layer data rate is 100 megabytes, which seriously restricts the high-definition digital video. Broadband data access and other services. And most of the existing access technology fixed transmission and reception frequency, which is not conducive to the system to adapt to complex scenarios. In view of the above practical problems, the paper is based on the EPoC standard. Using the idea of software radio technology, the coaxial signal transmission platform of RF direct sampling technology is studied and designed. The core networking technology of 4096QAM-OFDMA modulation mode of EPoC is studied, and the access network scene is abstracted into a laboratory test environment. At the same time, the classical sampling technology and software wireless are compared. Typical implementation of electrical technology. The direct sampling technology of RF is studied. Especially the dual-edge sampling technology of ADC and the multi-frequency response output technology of DAC. A coaxial signal transmission platform based on RF direct sampling technology is studied and implemented. The signal bandwidth and the number of subchannels can be allocated. The center frequency is adjustable in the range of 1536MHz. The SNR of the digital system loop is greater than 44dB. finally. In the laboratory environment, the actual network scene is simulated and tested to realize that the digital link loop EVM is less than 0.7, and the full link loop EVM after 100m coaxial distribution network is less than 1%. In FDD mode 4096QAM-OFDMA signal transmission to meet the design requirements. This paper designed and implemented the RF direct sampling technology of coaxial signal transmission platform. The feasibility of the scheme is verified by testing the functions and performance of the system. The scheme has been used in the new EPoC standard prestudy, which adds impetus to the research of the triple access network technology in China.
【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(hào)】：TN813
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本文編號(hào)：1392489