多維多階調(diào)制技術在光載無線通信系統(tǒng)中的應用研究
發(fā)布時間：2018-10-08 11:06
【摘要】：光纖無線通信(RoF)因為融合了無線通信和光纖通信的優(yōu)勢,具有速率高、容量大、接入靈活等特性,是未來寬帶無線接入領域的關鍵技術之一。同時,考慮到采用多維多階調(diào)制方式能夠進一步提高頻帶利用率和降低信號收發(fā)成本,因此其在RoF系統(tǒng)中的應用具有重要的理論意義和實用價值。本文分析了幾種常用的調(diào)制格式(包括歸零碼/非歸零碼、相移鍵控和正交幅度調(diào)制)和正交頻分復用(OFDM)、離散多音調(diào)制(DMT)技術以及脈幅調(diào)制(PAM)等若干新型調(diào)制格式的基本調(diào)制和解調(diào)原理;還分析了 RoF系統(tǒng)中電光調(diào)制和高頻信號解調(diào)技術,并介紹了光學外差技術的應用特性;在此基礎上,對多維多階調(diào)制技術在RoF系統(tǒng)中的應用展開了應用研究。具體研究內(nèi)容、仿真或?qū)嶒炑芯拷Y果如下:針對RoF系統(tǒng)中多維多階調(diào)制技術的應用進行了相關的理論闡述和實驗研究。給出并證明了一種10Gbit/s 4PAM-RoF光接入系統(tǒng)應用方案,搭建的接入系統(tǒng)成功實現(xiàn)了 40km光纖無誤碼傳輸;給出并證明了一種60GHz 4/16/64QAM-OFDM RoF光接入系統(tǒng)應用方案,分析比較了采用三種子載波排列方式(相鄰、相間、隨機)時系統(tǒng)收發(fā)和傳輸信號的特性;給出并證明了一種全雙工光生OFDM毫米波接入方案,其中下行鏈路采用64QAM-OFDM信號,上行鏈路采用8PSK-OFDM信號,實驗結果表明:在下行鏈路中,當接收光功率為-18dBm時,子載波數(shù)為256時,誤碼率接近10-3 7,接收靈敏度最佳,當上行鏈路的接收功率高于-28.5dBm時,接收信號的誤碼率在10 3以下;給出并證明了了一種在光載太赫茲(ToF)接入系統(tǒng)下行鏈路中傳輸128QAM-OFDM信號的新方案,實驗結果表明,下行傳輸128QAM-OFDM信號不但能實現(xiàn)較高的頻帶利用率,而且接收信號誤碼率(BER)為10-3時其接收機靈敏度值低于-1OdBm;給出并證明了一種以白光.LED燈作為可見光源的室內(nèi)實時通信方案,實驗結果表明,信號接收靈敏度大于-32dB時誤碼率低于10~(-6)。
[Abstract]:Optical fiber wireless communication (RoF) is one of the key technologies of broadband wireless access in the future because of its advantages of combining wireless communication and optical fiber communication, which has the characteristics of high speed, large capacity and flexible access. At the same time, considering that the multi-dimension and multi-order modulation can further improve the frequency band efficiency and reduce the cost of receiving and transmitting signals, its application in RoF system has important theoretical significance and practical value. In this paper, several common modulation schemes (including return-to-zero code / non-return-to-zero code) are analyzed. Phase shift keying and quadrature amplitude modulation), orthogonal frequency division multiplexing (OFDM),) discrete multitone modulation (DMT) technology, and pulse amplitude modulation (PAM) are the basic principles of modulation and demodulation. The techniques of electro-optic modulation and high-frequency signal demodulation in RoF system are also analyzed, and the application characteristics of optical heterodyne technology are introduced. On the basis of this, the application of multi-dimensional and multi-order modulation technology in RoF system is studied. The specific research contents, simulation and experimental results are as follows: the application of multi-dimensional and multi-order modulation technology in RoF system is discussed theoretically and experimentally. An application scheme of 10Gbit/s 4PAM-RoF optical access system is presented and proved. The 40km optical fiber BER transmission is successfully realized by the constructed access system, and an application scheme of 60GHz 4/16/64QAM-OFDM RoF optical access system is presented and proved. This paper analyzes and compares the characteristics of transceiver and transmission signals using three subcarrier arrangement (adjacent, interphase, random), and gives and proves a full duplex optical generation OFDM millimeter-wave access scheme, in which downlink uses 64QAM-OFDM signal. The uplink uses 8PSK-OFDM signal. The experimental results show that when the received optical power is -18dBm, the BER is close to 10-3.7 when the number of sub-carriers is 256.When the receiving power of uplink is higher than -28.5dBm, The error rate of the received signal is below 103. A new scheme of transmitting 128QAM-OFDM signal in the downlink of light-loaded terahertz (ToF) access system is presented and proved. The experimental results show that the downlink transmission of 128QAM-OFDM signal can not only achieve a higher frequency band utilization, Moreover, when the BER (BER) is 10-3, the receiver sensitivity is lower than -1 OdBm.The paper presents and proves an indoor real-time communication scheme with white light. The experimental results show that the BER is lower than 10 ~ (-6) when the signal reception sensitivity is greater than -32dB.
【學位授予單位】：重慶三峽學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1
本文編號：2256522
[Abstract]:Optical fiber wireless communication (RoF) is one of the key technologies of broadband wireless access in the future because of its advantages of combining wireless communication and optical fiber communication, which has the characteristics of high speed, large capacity and flexible access. At the same time, considering that the multi-dimension and multi-order modulation can further improve the frequency band efficiency and reduce the cost of receiving and transmitting signals, its application in RoF system has important theoretical significance and practical value. In this paper, several common modulation schemes (including return-to-zero code / non-return-to-zero code) are analyzed. Phase shift keying and quadrature amplitude modulation), orthogonal frequency division multiplexing (OFDM),) discrete multitone modulation (DMT) technology, and pulse amplitude modulation (PAM) are the basic principles of modulation and demodulation. The techniques of electro-optic modulation and high-frequency signal demodulation in RoF system are also analyzed, and the application characteristics of optical heterodyne technology are introduced. On the basis of this, the application of multi-dimensional and multi-order modulation technology in RoF system is studied. The specific research contents, simulation and experimental results are as follows: the application of multi-dimensional and multi-order modulation technology in RoF system is discussed theoretically and experimentally. An application scheme of 10Gbit/s 4PAM-RoF optical access system is presented and proved. The 40km optical fiber BER transmission is successfully realized by the constructed access system, and an application scheme of 60GHz 4/16/64QAM-OFDM RoF optical access system is presented and proved. This paper analyzes and compares the characteristics of transceiver and transmission signals using three subcarrier arrangement (adjacent, interphase, random), and gives and proves a full duplex optical generation OFDM millimeter-wave access scheme, in which downlink uses 64QAM-OFDM signal. The uplink uses 8PSK-OFDM signal. The experimental results show that when the received optical power is -18dBm, the BER is close to 10-3.7 when the number of sub-carriers is 256.When the receiving power of uplink is higher than -28.5dBm, The error rate of the received signal is below 103. A new scheme of transmitting 128QAM-OFDM signal in the downlink of light-loaded terahertz (ToF) access system is presented and proved. The experimental results show that the downlink transmission of 128QAM-OFDM signal can not only achieve a higher frequency band utilization, Moreover, when the BER (BER) is 10-3, the receiver sensitivity is lower than -1 OdBm.The paper presents and proves an indoor real-time communication scheme with white light. The experimental results show that the BER is lower than 10 ~ (-6) when the signal reception sensitivity is greater than -32dB.
【學位授予單位】：重慶三峽學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1
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