發(fā)布時(shí)間：2018-09-10 05:52

【摘要】：本文分析了國(guó)內(nèi)外對(duì)已有的室內(nèi)無(wú)線光網(wǎng)絡(luò)系統(tǒng),并針對(duì)性的提出了多信道接入策略,在組網(wǎng)中分析了多信道無(wú)線光網(wǎng)絡(luò)的跨層路由協(xié)議,用以解決傳統(tǒng)的分層結(jié)構(gòu)不適用室內(nèi)無(wú)線光網(wǎng)絡(luò)組網(wǎng)的實(shí)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(jìn)行了深入分析;通過(guò)對(duì)進(jìn)程信任模型進(jìn)行仿真,仿真結(jié)果表明,該方法在無(wú)線光網(wǎng)絡(luò)組網(wǎng)過(guò)程中的信道選擇方面具有一定優(yōu)勢(shì)。論文主要分為四個(gè)部分:(1)分析了室內(nèi)可見光通信信道的接收信號(hào)光功率分布特性,引入Phong模型,通過(guò)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(jié)果能更準(zhǔn)確的反映室內(nèi)光功率的強(qiáng)度分布特性;針對(duì)實(shí)際室內(nèi)照明環(huán)境,研究了多光源情況下基于Phong模型的室內(nèi)可見光信道沖激響應(yīng);在此基礎(chǔ)上,以O(shè)OK調(diào)制為例對(duì)不同傳輸速率下的室內(nèi)多徑噪聲進(jìn)行了分析和仿真。(2)對(duì)白光LED發(fā)光原理和調(diào)制特性進(jìn)行了分析,設(shè)計(jì)實(shí)現(xiàn)了LED的發(fā)送和接收電路,測(cè)試了目前市場(chǎng)上多種LED在不同調(diào)制度下的調(diào)制帶寬,根據(jù)LED頻響特性,設(shè)計(jì)了均衡電路,提高了系統(tǒng)帶寬;測(cè)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(lái)的碼間串?dāng)_,背景光噪聲帶來(lái)的干擾,以及LED調(diào)制帶寬限制等因素,對(duì)OOK、PPM、OFDM三種無(wú)線光調(diào)制技術(shù)在實(shí)際可見光通信系統(tǒng)中的性能進(jìn)行分析和仿真。(4)研究跨層設(shè)計(jì)在多信道無(wú)線光網(wǎng)絡(luò)中的應(yīng)用。傳統(tǒng)的多信道無(wú)線光網(wǎng)絡(luò)路由協(xié)議只是對(duì)路由判據(jù)或者多信道MAC協(xié)議進(jìn)行了改進(jìn),但在協(xié)議結(jié)構(gòu)上還是采用分層結(jié)構(gòu)。本文設(shè)計(jì)了一種適用于多信道無(wú)線光網(wǎng)絡(luò)的跨層機(jī)會(huì)路由協(xié)議CLRP(Cross-Layer Routing Protocol)。該協(xié)議結(jié)合了本文提出的CAPC多信道MAC協(xié)議和ORBA路由協(xié)議,并進(jìn)行了相應(yīng)的修改,使其兩者之間能夠?qū)崿F(xiàn)有效的信息交互。仿真結(jié)果表明,本文提出的CLRP協(xié)議在網(wǎng)絡(luò)吞吐量、數(shù)據(jù)包成功投遞率和路由收斂時(shí)間方面都優(yōu)于傳統(tǒng)的分層結(jié)構(gòu)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(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.1

【參考文獻(xiàn)】

相關(guān)碩士學(xué)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(xué);2011年

，

本文編號(hào)：2233547