本文關(guān)鍵詞： 空移鍵控調(diào)制 室內(nèi)可見光通信系統(tǒng) 改進(jìn)方案　出處：《西南交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：可見光通信技術(shù)是一種新興的在LED室內(nèi)照明基礎(chǔ)上發(fā)展起來的無線光通信技術(shù),利用白光LED響應(yīng)時間短、調(diào)制速率高的特性,設(shè)計(jì)出了室內(nèi)白光LED無線通信系統(tǒng)。白光LED無線通信系統(tǒng)可以同時用于照明和通信,既節(jié)能又減少了重復(fù)投資,因此,白光LED通信系統(tǒng)具有很大的研究意義,被公認(rèn)為是一種新興的短距離無線通信系統(tǒng)�？找奇I控(SSK)是近年來提出的一種新的調(diào)制方式,可以避免天線間干擾的MIMO傳輸技術(shù)。傳統(tǒng)多天線系統(tǒng)在所有天線上傳輸信號,會在天線之間造成干擾。SSK在一個時隙中根據(jù)傳輸信息在多根天線中選擇一根發(fā)射信號,從而避免了不同天線間的干擾,同時其信息僅由選擇的天線編號攜帶,不用進(jìn)行傳統(tǒng)調(diào)制,接收端根據(jù)不同天線發(fā)射時的獨(dú)特多徑特性來判斷天線編號,得到發(fā)射信息�？梢姽馔ㄐ诺默F(xiàn)有的調(diào)制方式少且在頻帶利用率和功率有效性上都有一定缺點(diǎn),而且受到室內(nèi)信道多徑效應(yīng)的影響嚴(yán)重。本課題擬借鑒SSK的思路,將其加入到室內(nèi)可見光通信系統(tǒng)中,作為該通信系統(tǒng)的一種調(diào)制技術(shù),不僅提高了頻帶利用率和能源利用率,還充分利用室內(nèi)信道的多徑效應(yīng)。 論文主要研究了空移鍵控調(diào)制系統(tǒng)和基于白光LED的室內(nèi)可見光通信系統(tǒng)。本文首先分析了SSK調(diào)制系統(tǒng)的調(diào)制原理以及接收端的檢測方式,其次分析了可見光通信系統(tǒng)的室內(nèi)信道,得到可行的信道的數(shù)學(xué)模型。然后將SSK調(diào)制系統(tǒng)應(yīng)用到室內(nèi)可見光通信系統(tǒng)中,利用MATLAB仿真,可知此應(yīng)用可行。然而,經(jīng)過多次仿真發(fā)現(xiàn),當(dāng)接收端與多個發(fā)射端距離相似時,系統(tǒng)性能極差,為此,本文引入廣義空移鍵控調(diào)制(GSSK)和自適應(yīng)控制來解決此問題。最后,本文又在信道條件不準(zhǔn)確的條件下,對系統(tǒng)進(jìn)行了仿真分析。
[Abstract]:Visible light communication technology is a new wireless optical communication technology developed on the basis of LED indoor lighting. The white light LED has the characteristics of short response time and high modulation rate. The indoor white light LED wireless communication system is designed. The white light LED wireless communication system can be used for both lighting and communication, which not only saves energy but also reduces the repeated investment. Therefore, the white light LED communication system has great research significance. It is recognized as a new type of short range wireless communication system. Air shift keying (SSK) is a new modulation technique proposed in recent years, which can avoid interantenna interference (MIMO). Traditional multi-antenna systems transmit signals on all antennas. It causes interference between antennas. SSK selects one of the multiple antennas in one slot according to the transmission information, thus avoiding interference between different antennas, and the information is carried only by the selected antenna number. Without traditional modulation, the receiver determines the antenna number according to the unique multipath characteristics of different antennas. The transmission information is obtained. The existing modulation methods of visible light communication have some shortcomings in frequency band efficiency and power efficiency, and are seriously affected by the multipath effect of indoor channel. This paper intends to draw lessons from the idea of SSK. As a modulation technique of indoor visible light communication system, it not only improves the efficiency of frequency band and energy, but also makes full use of the multipath effect of indoor channel. This paper mainly studies the air-shift keying modulation system and the indoor visible light communication system based on white-light LED. Firstly, the modulation principle of the SSK modulation system and the detection method of the receiver are analyzed. Secondly, the indoor channel of the visible light communication system is analyzed, and the feasible mathematical model of the channel is obtained. Then, the SSK modulation system is applied to the indoor visible light communication system, and the MATLAB simulation shows that the application is feasible. After many simulations, it is found that the performance of the system is extremely poor when the distance between the receiver and multiple transmitters is similar. In this paper, the generalized spatial shift keying modulation (GSSK) and adaptive control are introduced to solve this problem. In this paper, the system is simulated and analyzed under the condition of inaccurate channel conditions.
【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】：2014
【分類號】：TN929.1

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本文編號：1508859