【摘要】：光通信(OWC)結(jié)合了照明和通信兩大功能,采用發(fā)光二極管(LED)進(jìn)行數(shù)據(jù)交換,具有頻譜資源豐富、保密性好、節(jié)能環(huán)保等優(yōu)點(diǎn),逐漸成為廣泛關(guān)注的新型無(wú)線通信技術(shù)。本文以理論研究和分析為主,針對(duì)基于空間調(diào)制(SM)技術(shù)的OWC系統(tǒng)的信道容量展開研究,分別給出了信道容量的上下界,同時(shí)研究了自適應(yīng)調(diào)制技術(shù)在OWC系統(tǒng)的應(yīng)用。通過(guò)本文研究,可以進(jìn)一步豐富OWC的理論。由于OWC中光信號(hào)采用強(qiáng)度調(diào)制,和傳統(tǒng)無(wú)線射頻通信存在本質(zhì)差異,OWC信號(hào)是單極性的信號(hào),所以傳統(tǒng)射頻通信中的很多理論對(duì)OWC都不適用,因此研究OWC的相關(guān)問題變得十分必要。對(duì)于信道容量問題和自適應(yīng)調(diào)制技術(shù)而言,明確針對(duì)基于SM技術(shù)的OWC系統(tǒng)的結(jié)論尚沒有在公開發(fā)表的論文上出現(xiàn)。本論文分析對(duì)比了 OWC系統(tǒng)中常用的幾種空間調(diào)制技術(shù):空間位移鍵控調(diào)制(SSK),廣義空間位移鍵控調(diào)制(GSSK),空間調(diào)制(SM),廣義空間調(diào)制(GSM)�？臻g調(diào)制技術(shù)將待傳輸比特調(diào)制到信號(hào)域和空間域同時(shí)傳輸。信號(hào)域上將信息比特進(jìn)行脈沖幅度調(diào)制(PAM),調(diào)制符號(hào)對(duì)應(yīng)星座圖上的星座點(diǎn),空間域上將信息比特調(diào)制到激活LED的序號(hào),通過(guò)空間域符號(hào)提高了頻譜利用率。采用空間調(diào)制的通信系統(tǒng)不會(huì)受信道間干擾(ICI)的影響,也不需要對(duì)發(fā)射端的LED進(jìn)行同步,系統(tǒng)復(fù)雜度大大降低。本論文研究了基于SM技術(shù)的OWC系統(tǒng)的信道模型,推導(dǎo)了 OWC的信道容量。首先對(duì)OWC系統(tǒng)進(jìn)行分類,分為多輸入單輸出系統(tǒng)(MISO)和多輸入多輸出(MIMO)系統(tǒng)兩類,分別對(duì)信道容量進(jìn)行研究。接著利用信息處理不等式推導(dǎo)了下界信道容量;然后基于接收端準(zhǔn)確判決激活LED序號(hào)的假設(shè)推導(dǎo)了上界信道容量。本論文研究了自適應(yīng)調(diào)制技術(shù)在OWC系統(tǒng)中的應(yīng)用,并提出了最優(yōu)和次優(yōu)兩種方案。
[Abstract]:Optical communication (OWC), which combines the functions of lighting and communication, uses light-emitting diode (LED) to exchange data, has the advantages of rich spectrum resources, good confidentiality, energy saving and environmental protection, and has gradually become a new wireless communication technology which has been paid more and more attention. Based on the theoretical research and analysis, this paper studies the channel capacity of OWC system based on spatial modulation (SM) technology, gives the upper and lower bounds of channel capacity, and studies the application of adaptive modulation technology in OWC system. Through the research in this paper, the theory of OWC can be further enriched. Because the intensity modulation is used in the optical signal of OWC, and there is essential difference between the optical signal and the traditional radio frequency communication, the signal is unipolar, so many theories in the traditional radio frequency communication are not applicable to the OWC. Therefore, it is necessary to study the related problems of OWC. For channel capacity problem and adaptive modulation technology, the conclusion of OWC system based on SM technology has not appeared in the published papers. In this paper, several spatial modulation techniques commonly used in OWC system are analyzed and compared: spatial displacement keying modulation, (SSK), generalized spatial displacement keying modulation, (GSSK), spatial modulation, (SM), generalized spatial modulation (GSM). Spatial modulation technology modulates the bits to be transmitted to the signal domain and the spatial domain simultaneously. In the signal domain, the information bits are modulated by pulse amplitude modulation (PAM),) to correspond to the constellation points on the constellation map, and the information bits are modulated to the sequence number of the active LED in the spatial domain. The spectral efficiency is improved by the spatial symbol. The spatially modulated communication system is not affected by the interchannel interference (ICI), nor does it need to synchronize the LED of the transmitter, so the complexity of the system is greatly reduced. In this paper, the channel model of OWC system based on SM technology is studied, and the channel capacity of OWC is deduced. Firstly, the OWC system is classified into two categories: multiple input single output system (MISO) and multi-input and multi-output (MIMO) system. The channel capacity is studied respectively. Then the lower bound channel capacity is derived by using the information processing inequality, and the upper bound channel capacity is derived based on the assumption that the receiver can accurately determine the activation of the LED sequence number. In this paper, the application of adaptive modulation technology in OWC system is studied, and two schemes are proposed: optimal and suboptimal.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.1

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