本文選題：無線光通信　切入點：紫外光通信　出處：《北京郵電大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：無線光通信是近年來興起的無線通信與光通信結(jié)合的前沿交叉學(xué)科,其中基于紫外的無線光通信因其獨特的散射傳播特性而在短距離準(zhǔn)視距甚至非視距通信方向受到越來越多的關(guān)注。紫外無線光通信通常利用紫外日盲波段,是對常規(guī)通信方式的補充,相對于其他無線通信方式,紫外光通信具有保密性好、背景干擾小等特點,可應(yīng)用于需要保密通信的場合,因此具有重要的研究價值。 紫外無線光通信技術(shù)研究起步較晚,仍處于快速發(fā)展階段,尚有一些核心技術(shù)問題有待解決。國內(nèi)研究目前多集中于信道仿真理論模型的建立以及提高紫外無線光通信系統(tǒng)性能方法等方面,已取得了定成果。紫外信道損耗非常大,因此通常接收端所能接到的光信號非常微弱,若在有帶外雜光以及電路噪聲干擾的情況下進行通信,則需要采用去噪聲、抗干擾技術(shù)以提高通信系統(tǒng)的性能,所以紫外無線通信系統(tǒng)的探測端噪聲、數(shù)字濾波去噪方法、紫外擴頻通信方案等研究具有重要意義。 紫外光電轉(zhuǎn)換器件作為接收端核心器件,其噪聲性能對紫外光通信系統(tǒng)性能具有重要影響。論文歸納總結(jié)了幾種常見紫外光電探測器的噪聲因素,并進行了實測分析。 為了降低各類噪聲對紫外通信系統(tǒng)性能的影響,論文設(shè)計實現(xiàn)并驗證了均值濾波和中值濾波兩種濾波方法,在此基礎(chǔ)上設(shè)計并實現(xiàn)了針對紫外通信特性的自適應(yīng)濾波方法,通過實驗測試,該方案在室外噪聲干擾下,可以有效提高紫外通信系統(tǒng)信噪比達8dB。 為了提高紫外通信系統(tǒng)的抗多徑衰落和抗干擾能力,論文提出了將擴頻技術(shù)應(yīng)用于紫外通信系統(tǒng)的方案,并進行了理論分析和系統(tǒng)仿真,設(shè)計實現(xiàn)了OOK(On-Off Keying)、7-SIK(Sequence Inversion Keying,SIK)、63-SIK調(diào)制下的紫外擴頻通信實驗系統(tǒng),實測結(jié)果表明該方案能夠有效提高紫外通信系統(tǒng)的誤碼率性能。由于受限于實驗室器件的影響,實驗室搭建的紫外通信系統(tǒng)距離通常較短,通過對基于蒙特卡羅紫外通信信道模型的分析和對實際噪聲環(huán)境的測量,論文對紫外通信距離進行了理論推算。
[Abstract]:Wireless optical communication (WO) is a frontier interdiscipline of wireless communication and optical communication, which has emerged in recent years. Among them, ultraviolet wireless optical communication has attracted more and more attention in short range quasi-line-of-sight and even non-line-of-sight communication due to its unique scattering propagation characteristics. Ultraviolet wireless optical communication usually uses ultraviolet sun-blind band. Compared with other wireless communication modes, UV communication has the characteristics of good confidentiality and low background interference, so it can be applied to the occasions where secure communication is needed, so it has important research value. The research of ultraviolet wireless optical communication technology started late and is still in the rapid development stage. There are still some core technical problems to be solved. At present, many domestic researches have focused on the establishment of theoretical model of channel simulation and the methods of improving the performance of ultraviolet wireless optical communication system, and have achieved certain results. Therefore, the optical signal received by the receiver is usually very weak. If there is out-of-band clutter and circuit noise interference, it is necessary to use de-noise and anti-jamming techniques to improve the performance of the communication system. Therefore, it is of great significance to study the detection end noise, the digital filtering denoising method and the ultraviolet spread spectrum communication scheme of the ultraviolet wireless communication system. As the core device of the receiver, the noise performance of the UV photovoltaic device has an important effect on the performance of the ultraviolet communication system. This paper summarizes the noise factors of several common UV photodetectors, and analyzes the noise factors of several common UV photodetectors. In order to reduce the influence of all kinds of noise on the performance of ultraviolet communication system, two filtering methods, mean filter and median filter, are designed and verified in this paper. On this basis, an adaptive filtering method for ultraviolet communication characteristics is designed and implemented. The experimental results show that the proposed scheme can effectively improve the signal-to-noise ratio (SNR) of UV communication system up to 8 dB under outdoor noise interference. In order to improve the anti-multipath fading and anti-interference ability of the ultraviolet communication system, the scheme of applying spread spectrum technology to the ultraviolet communication system is put forward, and the theoretical analysis and system simulation are carried out. An experimental system of ultraviolet spread spectrum communication based on OOK(On-Off Keyingence Inversion sequence and SIKN 63-SIK modulation is designed and implemented. The experimental results show that the proposed scheme can effectively improve the BER performance of the UV communication system. Due to the influence of laboratory devices, the proposed scheme can effectively improve the BER performance of the UV communication system. The distance of the ultraviolet communication system built in the laboratory is usually short. The ultraviolet communication distance is calculated theoretically by analyzing the channel model based on Monte Carlo ultraviolet communication and measuring the actual noise environment.
【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】：2015
【分類號】：TN929.1

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相關(guān)期刊論文 前2條

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本文編號：1645976