本文選題：IEEE + 802.15.7��； 參考：《吉林大學》2017年碩士論文

【摘要】：近年來,可見光通信技術VLC(visible light communication)以兼顧照明和通信的雙重優(yōu)勢成為無線通信領域的研究熱點。IEEE 802.15.7協(xié)議為短距離無線光通信提供了一個全球標準,該協(xié)議可以應用于區(qū)域照明、標識牌、路燈、車載系統(tǒng)、交通信號燈等領域,具有很廣闊的應用前景�？梢姽馔ㄐ胖械慕K端設備通常是使用電池供電,設備的能量受限,從而影響使用壽命。本文研究的場景是將可見光終端設備用于智能家居,終端設備鑲嵌在墻壁,這將會使得更換電池變得不可操作,而能量收集技術(EH)是針對能量受限網(wǎng)絡的一種有效的解決辦法。本文主要考慮收集室內隨處可見且穩(wěn)定的可見光能量,并建立可見光能量收集模型,考慮了終端設備與協(xié)調器之間的距離、終端處的接收角以及不同位置的遮擋概率對能量收集產生的影響。由于可見光具有衰減快、直線傳播的特性,能量收集技術的引入會給IEEE 802.15.7可見光通信協(xié)議帶來新的挑戰(zhàn)。本文將具體研究能量收集技術與可見光通信結合后產生的問題并給出解決方案,為實際網(wǎng)絡中的性能評估和優(yōu)化提供一定的依據(jù)。本文首先研究了室內可見光能量收集模型。針對室內可見光場景,文章通過理論和仿真給出了室內LED燈的合理布局。在考慮了終端設備和協(xié)調器之間的距離、終端處的接收角后,給出了室內可見光能量收集模型。由于本文主要考慮的場景是設備部署在墻壁上,所以通過仿真給出了四周墻壁的能量分布圖。文中還考慮了可見光的易遮擋特性,給出了一個考慮移動物體高度分布的室內可見光遮擋模型。然后,本文研究了具有能量收集能力的室內可見光通信的MAC協(xié)議(EH-MAC)。由于能量收集速率隨著距離、接收角和遮擋概率的不同而變化,所以設備間就會存在吞吐量不公平性。在之前提出的可見光能量收集模型和可見光遮擋概率模型的基礎上,我們給出了能量自適應競爭算法(EAC)來改善這個不公平性難題。使用該算法,設備能根據(jù)能量接收速率自適應調整競爭窗口,能量收集速率低的設備獲得較小的競爭窗口來提高它的傳輸機會,而能量收集速率高的設備將獲得較大的競爭窗口,降低了它的傳輸機會。通過實驗仿真,改進的MAC協(xié)議提高了能量收集速率低的設備的吞吐量,降低了能量收集速率高的設備的吞吐量,從而使得設備獲得較高的公平性。最后,本文使用二維離散時間馬爾科夫鏈對EH-MAC/EAC的退避過程進行建模。不同能量收集速率的設備會選擇兩種不同的退避策略,文章對這兩種退避策略分別進行Markov chain建模,并且在建模過程中考慮了可見光的易遮擋特性。通過理論分析給出了改進后的EH-MAC/EAC的吞吐量和公平性,實驗仿真和理論分析基本吻合。
[Abstract]:In recent years, the visible light communication technology (VLC(visible light) has become a research hotspot in wireless communication field with the dual advantages of both lighting and communication. IEEE 802.15.7 protocol provides a global standard for short-range wireless optical communication, and this protocol can be applied to regional lighting. Signboards, street lamps, vehicular systems, traffic lights and other fields, has a very broad application prospects. The terminal equipment in visible light communication is usually powered by battery, and the energy of the equipment is limited, which affects the service life. The scene studied in this paper is that the visible light terminal device is used in the smart home, and the terminal device is embedded in the wall, which will make the battery replacement become inoperable. The energy collection technology (EH) is an effective solution for the energy limited network. In this paper, we mainly consider collecting the visible light energy which is everywhere and stable in the room, and establish the visible light energy collection model, considering the distance between the terminal equipment and the coordinator. The influence of the receiving angle at the terminal and the occlusion probability at different positions on the energy collection. Because visible light has the characteristics of fast attenuation and straight line propagation, the introduction of energy collection technology will bring new challenges to IEEE 802.15.7 visible light communication protocol. In this paper, the problems caused by the combination of energy collection technology and visible light communication are studied and the solutions are given, which provide some basis for the performance evaluation and optimization of the actual network. In this paper, the energy collection model of indoor visible light is studied. Aiming at the scene of indoor visible light, the reasonable layout of indoor LED lamp is given through theory and simulation. After considering the distance between the terminal equipment and the coordinator and the receiving angle of the terminal, an indoor visible light energy collection model is presented. Because the main scenario of this paper is that the equipment is deployed on the wall, the energy distribution diagram of the surrounding wall is given by simulation. In this paper, an indoor visible light occlusion model considering the height distribution of moving objects is presented. Then, the MAC protocol of indoor visible light communication with energy collection capability is studied. Because the rate of energy collection varies with distance, reception angle and occlusion probability, there is unfairness in throughput between devices. Based on the visible light energy collection model and the visible light occlusion probability model, we present an energy adaptive competition algorithm (EAC) to improve the unfairness problem. Using this algorithm, the device can adjust the competition window adaptively according to the energy receiving rate, and the device with low energy collection rate can obtain smaller competition window to improve its transmission opportunity. And the equipment with high energy collection rate will obtain a large competition window, which reduces its transmission opportunity. Through the experimental simulation, the improved MAC protocol can improve the throughput of the equipment with low energy collection rate and reduce the throughput of the equipment with high energy collection rate, thus making the device obtain higher fairness. Finally, the two-dimensional discrete-time Markov chain is used to model the Backoff process of EH-MAC/EAC. Two different Backoff strategies are chosen for devices with different energy collection rates. In this paper, Markov chain is used to model the two Backoff strategies, and the obfuscation characteristics of visible light are taken into account in the modeling process. The throughput and fairness of the improved EH-MAC/EAC are given through theoretical analysis, and the experimental results are in good agreement with the theoretical analysis.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN929.1

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