【摘要】：本文分析了國內外對已有的室內無線光網(wǎng)絡系統(tǒng),并針對性的提出了多信道接入策略,在組網(wǎng)中分析了多信道無線光網(wǎng)絡的跨層路由協(xié)議,用以解決傳統(tǒng)的分層結構不適用室內無線光網(wǎng)絡組網(wǎng)的實際,提出根據(jù)不同信道之間的差異性選擇較好的信道用于傳輸數(shù)據(jù)的方法,并進行了深入分析;通過對進程信任模型進行仿真,仿真結果表明,該方法在無線光網(wǎng)絡組網(wǎng)過程中的信道選擇方面具有一定優(yōu)勢。論文主要分為四個部分:(1)分析了室內可見光通信信道的接收信號光功率分布特性,引入Phong模型,通過模型仿真分析發(fā)現(xiàn),與常用的朗伯模型相比,基于Phong模型的仿真分析結果能更準確的反映室內光功率的強度分布特性;針對實際室內照明環(huán)境,研究了多光源情況下基于Phong模型的室內可見光信道沖激響應;在此基礎上,以OOK調制為例對不同傳輸速率下的室內多徑噪聲進行了分析和仿真。(2)對白光LED發(fā)光原理和調制特性進行了分析,設計實現(xiàn)了LED的發(fā)送和接收電路,測試了目前市場上多種LED在不同調制度下的調制帶寬,根據(jù)LED頻響特性,設計了均衡電路,提高了系統(tǒng)帶寬;測試研究了可見光通信系統(tǒng)的環(huán)境噪聲及干擾。(3)基于制約可見光通信系統(tǒng)性能的因素考慮,主要包括多徑噪聲帶來的碼間串擾,背景光噪聲帶來的干擾,以及LED調制帶寬限制等因素,對OOK、PPM、OFDM三種無線光調制技術在實際可見光通信系統(tǒng)中的性能進行分析和仿真。(4)研究跨層設計在多信道無線光網(wǎng)絡中的應用。傳統(tǒng)的多信道無線光網(wǎng)絡路由協(xié)議只是對路由判據(jù)或者多信道MAC協(xié)議進行了改進,但在協(xié)議結構上還是采用分層結構。本文設計了一種適用于多信道無線光網(wǎng)絡的跨層機會路由協(xié)議CLRP(Cross-Layer Routing Protocol)。該協(xié)議結合了本文提出的CAPC多信道MAC協(xié)議和ORBA路由協(xié)議,并進行了相應的修改,使其兩者之間能夠實現(xiàn)有效的信息交互。仿真結果表明,本文提出的CLRP協(xié)議在網(wǎng)絡吞吐量、數(shù)據(jù)包成功投遞率和路由收斂時間方面都優(yōu)于傳統(tǒng)的分層結構協(xié)議。
[Abstract]:This paper analyzes the existing indoor wireless optical network systems at home and abroad, and puts forward a multi-channel access strategy. In the networking, the cross-layer routing protocol of the multi-channel wireless optical network is analyzed to solve the problem that the traditional layered structure is not suitable for indoor wireless optical network networking, and the difference between different channels is proposed. Through the simulation of process trust model, the simulation results show that the method has certain advantages in the channel selection in the process of wireless optical network. The paper mainly consists of four parts: (1) The received letter of indoor visible light communication channel is analyzed. Phong model is introduced to simulate the signal power distribution characteristics. Compared with Lambert model, the simulation results based on Phong model can more accurately reflect the intensity distribution characteristics of indoor light power. On this basis, the indoor multipath noise at different transmission rates is analyzed and simulated with OOK modulation as an example. (2) The luminous principle and modulation characteristics of white LED are analyzed, the transmitting and receiving circuits of LED are designed and realized, and the modulation bandwidth of various LED in different modulation degrees is tested according to LE. D-frequency response characteristics, design equalization circuit, improve the system bandwidth; test and study the environmental noise and interference of the visible light communication system. (3) Considering the factors that restrict the performance of the visible light communication system, mainly including inter-symbol interference caused by multipath noise, interference caused by background light noise, and the limitation of LED modulation bandwidth and other factors, OK, P The performance of three wireless optical modulation technologies, PM and OFDM, is analyzed and simulated in practical visible optical communication systems. (4) The application of cross-layer design in multi-channel wireless optical networks is studied. A cross-layer opportunistic routing protocol CLRP (Cross-Layer Routing Protocol) for multi-channel wireless optical networks is designed in this paper. This protocol combines the CAPC multi-channel MAC protocol and ORBA routing protocol and makes corresponding modifications to enable effective information exchange between them. It is shown that the proposed CLRP protocol outperforms the traditional hierarchical protocol in terms of network throughput, packet delivery rate and routing convergence time.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.1

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相關碩士學位論文 前1條

1 梅衛(wèi)平;基于白光LED的可見光通信系統(tǒng)的研究[D];中南大學;2011年

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本文編號：2233547