本文關(guān)鍵詞：基于FPGA的無線光通信調(diào)制技術(shù)研究及實現(xiàn)　出處：《北京郵電大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 無線光通信 可見光通信 紫外光通信 擴頻 偽隨機碼

【摘要】：無線光通信使用光波作為載體來傳輸信息,可以緩解日益緊張的無線射頻頻譜資源,并具有帶寬高、輻射低、抗干擾等光通信的特點,因而受到國內(nèi)外的重視,成為無線領(lǐng)域研究的熱點之一。 無線光通信在國內(nèi)外發(fā)展迅速,隨著相關(guān)技術(shù)的發(fā)展,如發(fā)光二極管壽命增長及調(diào)制帶寬增高,光電探測器靈敏度增高以及響應(yīng)速度增快等,有著較大的發(fā)展?jié)摿蛻?yīng)用前景。為了提高無線光通信的頻譜利用率,可以通過提高發(fā)射光功率,增大光電探測器的探測面積,選擇適合大氣窗口的激光波長,選擇合適系統(tǒng)的調(diào)制解調(diào)技術(shù)等方法實現(xiàn),但由于激光對人眼傷害,不可盲目提高系統(tǒng)發(fā)射光功率,探測面積增大導(dǎo)致系統(tǒng)頻帶利用率降低等。在目前這種情況和現(xiàn)有的光學(xué)器件發(fā)展基礎(chǔ)上,需要盡可能在移動設(shè)備上減少能量消耗,尋找適合紫外光通信的調(diào)制解調(diào)技術(shù)來提高紫外光通信的性能顯得尤為重要。 本文首先概括分析了無線光譜的特性,闡述了無線光通信的通信特點及原理；為了更好的提高通信系統(tǒng)的性能,系統(tǒng)除了使用大功率激光器、高靈敏度的激光探測器以及選擇適合大氣窗口的激光波長外,還可以通過采用不同的調(diào)制方式來提高系統(tǒng)的可靠性和有效性,本文設(shè)計實現(xiàn)了目前適合紫外光通信的開關(guān)鍵控調(diào)制OOK,脈沖位置調(diào)制PPM、差分脈沖位置調(diào)制DPPM、數(shù)字脈沖間隔調(diào)制DPIM、雙頭脈沖間隔調(diào)制DH-PIM以及等長脈沖間隔調(diào)制FDPIM等多種調(diào)制解調(diào)技術(shù),并對各種調(diào)制技術(shù)的進行了實驗測試得出多種調(diào)制解調(diào)技術(shù)的平均光功率、傳輸容量、傳輸速率、誤碼率等通信性能對比圖,分析后得出結(jié)論：各種調(diào)制方式在頻譜利用率、誤碼性能上還有待進一步提高；本文提出使用當(dāng)前3G通信的核心擴頻技術(shù)方案作為調(diào)制方式,設(shè)計并實現(xiàn)了紫外光擴頻通信實驗系統(tǒng),通過實驗驗證了擴頻編碼后的信息經(jīng)過傳輸后能明顯降低誤碼率,且誤碼率隨著擴頻序列周期的增加而減�。蛔詈蟾鶕�(jù)擴頻技術(shù)原理和PN碼的正交性,提出了基于紫外光通信的多用戶擴頻通信,并設(shè)計了實現(xiàn)方法,做技術(shù)總結(jié)和展望。
[Abstract]:Wireless optical communication uses optical wave as a carrier to transmit information, which can alleviate the increasingly tight radio frequency spectrum resources, and has the characteristics of high bandwidth, low radiation, anti-jamming and other optical communication characteristics, so it has been paid attention to at home and abroad. It has become one of the hotspots in wireless field. Wireless optical communication is developing rapidly at home and abroad. With the development of related technologies, such as the increase of light-emitting diode lifetime and modulation bandwidth, the sensitivity of photodetector and the increase of response speed, etc. In order to improve the spectrum efficiency of wireless optical communication, the laser wavelength suitable for atmospheric window can be selected by increasing the power of emitting light and increasing the detection area of photodetector. The method of modulation and demodulation is chosen, but the laser can't increase the optical power of the system blindly because of the damage to the human eyes. On the basis of the current situation and the development of optical devices, it is necessary to reduce the energy consumption on mobile devices as much as possible. It is very important to find suitable modulation and demodulation technology to improve the performance of ultraviolet communication. In this paper, the characteristics of wireless spectrum are analyzed, and the communication characteristics and principles of wireless optical communication are described. In order to improve the performance of the communication system, in addition to the use of high-power lasers, high-sensitivity laser detectors and the selection of laser wavelength suitable for the atmosphere window. Different modulation methods can also be used to improve the reliability and effectiveness of the system. In this paper, open key modulation OOK and pulse position modulation PPM, which are suitable for UV communication, are designed and implemented. Differential pulse position modulation (DPP), digital pulse interval modulation (DPIM), dual-head pulse interval modulation (DH-PIM) and equal-length pulse interval modulation (FDPIM) are used in this paper. The average optical power, transmission capacity, transmission rate and bit error rate of various modulation and demodulation techniques are compared with each other. After analysis, it is concluded that the spectrum efficiency and error performance of various modulation methods need to be further improved; In this paper, we design and implement the experimental system of ultraviolet spread spectrum communication using the core spread spectrum technology of 3G communication as modulation mode. It is verified by experiments that the BER can be significantly reduced after the spread spectrum coding information is transmitted, and the BER decreases with the increase of the spread spectrum sequence cycle. Finally, according to the principle of spread spectrum technology and the orthogonality of PN code, the multi-user spread spectrum communication based on ultraviolet light communication is proposed, and the implementation method is designed, and the technical summary and prospect are made.
【學(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.1

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