面向無線接入的光載無線鏈路設(shè)計(jì)
發(fā)布時間：2019-05-08 01:39
【摘要】：隨著通信技術(shù)的快速發(fā)展,各種新興業(yè)務(wù)的不斷涌現(xiàn),帶寬的需求不斷增加,對現(xiàn)有通信系統(tǒng)提出了嚴(yán)峻的挑戰(zhàn)。而RoF技術(shù)結(jié)合了光纖通信的帶寬優(yōu)勢和無線通信的移動優(yōu)勢,成為解決這一問題的潛在解決方案。另一方面可以通過提升載波頻率,發(fā)掘利用未開發(fā)的毫米波頻段,避免頻譜擁塞的同時,增加了通信帶寬,從而解決帶寬瓶頸的問題。因此同時結(jié)合上述兩種方案的優(yōu)勢,即在毫米波無線接入網(wǎng)中利用RoF技術(shù)就具有非常重大的意義。本文首先概述了 RoF系統(tǒng)的起源、研究背景、優(yōu)勢、應(yīng)用領(lǐng)域以及國內(nèi)外對該技術(shù)的研究現(xiàn)狀。然后詳細(xì)分析了 RoF系統(tǒng)的基本結(jié)構(gòu),并且理論推導(dǎo)了相位調(diào)制器和強(qiáng)度調(diào)制器的產(chǎn)生機(jī)理,闡述了雙邊帶調(diào)制、單邊帶調(diào)制和載波抑制調(diào)制的實(shí)現(xiàn)原理。同時,對于RoF系統(tǒng)中的頻率轉(zhuǎn)換,介紹了采用光外差法和OEO (Optoelectronic Oscillator)技術(shù)對信號進(jìn)行上變頻。同時介紹了采用包絡(luò)檢波的方法對接收端的信號下變頻�；谏鲜龅睦碚摶A(chǔ),本文在RoF系統(tǒng)設(shè)計(jì)方面主要做了以下工作:(1)研究并且實(shí)驗(yàn)驗(yàn)證了一種基于OEO的頻率可調(diào)諧的光載無線接入方案。通過在OEO結(jié)構(gòu)中融合可調(diào)諧的微波光子濾波器來實(shí)現(xiàn)系統(tǒng)的可調(diào)諧性能。而微波光子濾波器主要是基于相移光纖布拉格光柵(PS-FBG)的陷波濾波。實(shí)驗(yàn)中實(shí)現(xiàn)了 1.25Gbit/s的OOK信號的傳輸,產(chǎn)生的載波的可調(diào)諧范圍為8-14.5GHz。通過將OEO融合進(jìn)RoF系統(tǒng)的發(fā)射端,其振蕩產(chǎn)生的載波頻率可以便捷的通過調(diào)節(jié)輸入光信號的波長來控制,無線接收端采用包絡(luò)檢波的方法來實(shí)現(xiàn)信號的解調(diào)。因此,整體系統(tǒng)中均不需要外置的微波源進(jìn)行信號的上下變頻,降低了系統(tǒng)成本。(2)鑒于長距離隧道內(nèi)復(fù)雜的無線傳輸環(huán)境,研究了一種基于波分復(fù)用無源光網(wǎng)絡(luò)的光載無線(RoF)隧道通信系統(tǒng)。該系統(tǒng)采用波分復(fù)用技術(shù)實(shí)現(xiàn)不同業(yè)務(wù)在光域的物理隔離,協(xié)同分布式天線技術(shù)在隧道內(nèi)部提供高頻無線接入,在提升系統(tǒng)帶寬的同時解決了隧道內(nèi)部高頻信號急劇衰減的問題。最后通過實(shí)驗(yàn)搭建了全雙工的光載無線實(shí)驗(yàn)平臺,實(shí)現(xiàn)了用光學(xué)的方法產(chǎn)生和傳輸了載頻為24G的16/64QAM矢量信號。(3)將多載波技術(shù)與RoF技術(shù)相結(jié)合,基于optisystem 14軟件仿真搭建了 OFDM-RoF光載無線系統(tǒng)。在此基礎(chǔ)上,使用商業(yè)的4GVoLTE語音系統(tǒng),實(shí)驗(yàn)搭建了 VoLTE-RoF演示驗(yàn)證平臺。
[Abstract]:With the rapid development of communication technology, the emergence of a variety of new services, the increasing demand for bandwidth, the existing communications systems pose a serious challenge. The RoF technology combines the bandwidth advantage of optical fiber communication with the mobile advantage of wireless communication, and becomes a potential solution to this problem. On the other hand, the bandwidth bottleneck can be solved by raising the carrier frequency, exploiting the undeveloped millimeter wave frequency band, avoiding spectrum congestion and increasing the communication bandwidth. Therefore, combining the advantages of the two schemes at the same time, it is of great significance to utilize RoF technology in millimeter wave wireless access network. In this paper, the origin, research background, advantages, application fields and research status of RoF system at home and abroad are summarized. Then, the basic structure of RoF system is analyzed in detail, and the generation mechanism of phase modulator and intensity modulator is deduced theoretically, and the realization principles of two-side band modulation, one-sided band modulation and carrier suppression modulation are expounded. At the same time, for the frequency conversion in RoF system, the optical heterodyne method and OEO (Optoelectronic Oscillator) technology are introduced to up-convert the signal. At the same time, the method of envelope detection is introduced to down-convert the receiver signal. Based on the above-mentioned theoretical basis, the main work of this paper is as follows: (1) A frequency-tunable optical-borne wireless access scheme based on OEO is studied and verified experimentally. The main work of this paper is as follows: (1) the design of RoF system is as follows: 1. The tunable performance of the system is realized by combining the tunable microwave photonic filter in the OEO structure. Microwave photonic filter is mainly based on phase-shifted fiber Bragg grating (PS-FBG) notch filter. In the experiment, the transmission of the OOK signal of 1.25Gbit/s is realized, and the tunable range of the generated carrier is 8 ~ 14.5GHz. By merging the OEO into the transmitter of the RoF system, the carrier frequency generated by the oscillation can be easily controlled by adjusting the wavelength of the input optical signal, and the wireless receiver uses the envelope detection method to realize the demodulation of the signal. Therefore, no external microwave source is needed in the whole system, which reduces the cost of the system. (2) in view of the complex wireless transmission environment in the long-distance tunnel, A optical-borne wireless (RoF) tunnel communication system based on wavelength division multiplexing (WDM) passive optical network is studied in this paper. The system uses wavelength division multiplexing technology to realize physical isolation of different services in optical domain, and cooperative distributed antenna technology to provide high frequency wireless access in the tunnel. While raising the bandwidth of the system, the problem of the sharp attenuation of the high frequency signal in the tunnel is solved at the same time. Finally, a full-duplex optical-borne wireless experimental platform is built, and the 16/64QAM vector signal with the carrier frequency of 24G is generated and transmitted by optical method. (3) the multicarrier technology is combined with the RoF technology, and the optical signal is generated and transmitted by optical method. (3) the multi-carrier technology is combined with the RoF technology. Based on optisystem 14 software, a OFDM-RoF optical carrier wireless system is built. On this basis, using the commercial 4GVoLTE voice system, the VoLTE-RoF demonstration verification platform is built.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN925.93
本文編號：2471519
[Abstract]:With the rapid development of communication technology, the emergence of a variety of new services, the increasing demand for bandwidth, the existing communications systems pose a serious challenge. The RoF technology combines the bandwidth advantage of optical fiber communication with the mobile advantage of wireless communication, and becomes a potential solution to this problem. On the other hand, the bandwidth bottleneck can be solved by raising the carrier frequency, exploiting the undeveloped millimeter wave frequency band, avoiding spectrum congestion and increasing the communication bandwidth. Therefore, combining the advantages of the two schemes at the same time, it is of great significance to utilize RoF technology in millimeter wave wireless access network. In this paper, the origin, research background, advantages, application fields and research status of RoF system at home and abroad are summarized. Then, the basic structure of RoF system is analyzed in detail, and the generation mechanism of phase modulator and intensity modulator is deduced theoretically, and the realization principles of two-side band modulation, one-sided band modulation and carrier suppression modulation are expounded. At the same time, for the frequency conversion in RoF system, the optical heterodyne method and OEO (Optoelectronic Oscillator) technology are introduced to up-convert the signal. At the same time, the method of envelope detection is introduced to down-convert the receiver signal. Based on the above-mentioned theoretical basis, the main work of this paper is as follows: (1) A frequency-tunable optical-borne wireless access scheme based on OEO is studied and verified experimentally. The main work of this paper is as follows: (1) the design of RoF system is as follows: 1. The tunable performance of the system is realized by combining the tunable microwave photonic filter in the OEO structure. Microwave photonic filter is mainly based on phase-shifted fiber Bragg grating (PS-FBG) notch filter. In the experiment, the transmission of the OOK signal of 1.25Gbit/s is realized, and the tunable range of the generated carrier is 8 ~ 14.5GHz. By merging the OEO into the transmitter of the RoF system, the carrier frequency generated by the oscillation can be easily controlled by adjusting the wavelength of the input optical signal, and the wireless receiver uses the envelope detection method to realize the demodulation of the signal. Therefore, no external microwave source is needed in the whole system, which reduces the cost of the system. (2) in view of the complex wireless transmission environment in the long-distance tunnel, A optical-borne wireless (RoF) tunnel communication system based on wavelength division multiplexing (WDM) passive optical network is studied in this paper. The system uses wavelength division multiplexing technology to realize physical isolation of different services in optical domain, and cooperative distributed antenna technology to provide high frequency wireless access in the tunnel. While raising the bandwidth of the system, the problem of the sharp attenuation of the high frequency signal in the tunnel is solved at the same time. Finally, a full-duplex optical-borne wireless experimental platform is built, and the 16/64QAM vector signal with the carrier frequency of 24G is generated and transmitted by optical method. (3) the multicarrier technology is combined with the RoF technology, and the optical signal is generated and transmitted by optical method. (3) the multi-carrier technology is combined with the RoF technology. Based on optisystem 14 software, a OFDM-RoF optical carrier wireless system is built. On this basis, using the commercial 4GVoLTE voice system, the VoLTE-RoF demonstration verification platform is built.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN925.93
【引證文獻(xiàn)】
相關(guān)碩士學(xué)位論文 前2條
1 荊士泉;基于光載無線技術(shù)的工業(yè)網(wǎng)關(guān)研究與設(shè)計(jì)[D];湖南工業(yè)大學(xué);2018年
2 莊云圣;基于光載無線技術(shù)的多業(yè)務(wù)傳輸系統(tǒng)研究[D];西南交通大學(xué);2018年
，本文編號：2471519
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