發(fā)布時間：2018-02-09 01:57

  本文關(guān)鍵詞： 可見光通信 光空間調(diào)制 廣義光空間調(diào)制 功率分配 信道編碼　出處：《東南大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：作為對傳統(tǒng)射頻通信(Ratio Frequency, RF)的重要補(bǔ)充,可見光通信技術(shù)(Visual Light Commu-nications, VLC)近年來已經(jīng)成為無線通信領(lǐng)域的研究熱點(diǎn)。由于照明設(shè)備幾乎遍及生活的每個角落,通過照明設(shè)備進(jìn)行無線通信是一種有效而可行的無線通信方案。相較于傳統(tǒng)的射頻通信,可見光通信具有節(jié)能環(huán)保、綠色健康、保密性高、未認(rèn)證頻譜資源豐富等一系列優(yōu)點(diǎn)。但是,受照明用LED器件的開關(guān)速度影響,可見光通信系統(tǒng)傳輸帶寬受限,高效利用可見光通信系統(tǒng)的頻譜資源十分重要。由于實(shí)際的照明系統(tǒng)通常采用多個LED光源組成陣列以提供充足的照明,多輸入多輸出(Multiple Input Multiple Output, MIMO)傳輸方案在可見光通信領(lǐng)域受到了廣泛關(guān)注和研究�？臻g調(diào)制(Spatial Modulation, SM)技術(shù)正是一種將MIMO傳輸技術(shù)與傳統(tǒng)數(shù)字調(diào)制技術(shù)相結(jié)合的調(diào)制方式,通過將傳統(tǒng)的數(shù)字調(diào)制星座擴(kuò)展到空間維度,來提升通信系統(tǒng)的頻譜效率。在空間調(diào)制系統(tǒng)中存在多個空間上相互隔離的發(fā)射機(jī),但同一時刻系統(tǒng)只允許其中一個發(fā)射機(jī)處于工作狀態(tài),從而實(shí)現(xiàn)通過工作的發(fā)射機(jī)序號來傳輸額外的比特信息。這種調(diào)制方案通過使用多個發(fā)射機(jī)來提升通信系統(tǒng)的頻譜效率并完全避免了各個發(fā)射機(jī)之間的信道間干擾(Inter-Channel Interference, ICI),能很好地適用于可見光通信系統(tǒng)。本文主要就是對可見光通信中空間調(diào)制技術(shù)進(jìn)行了研究。本論文首先對可見光通信系統(tǒng)做了總體性的闡述,包括系統(tǒng)結(jié)構(gòu)、光發(fā)射機(jī)和接收機(jī)器件、室內(nèi)可見光信道模型以及常用的調(diào)制方式等。在此基礎(chǔ)上介紹了可見光通信系統(tǒng)中常用的三種MIMO傳輸方式：重復(fù)編碼(Repetition Coding, RC)、空間復(fù)用(Spatial Multiplexing, SMP)和空間調(diào)制,并分析比較了這三種MIMO傳輸技術(shù)的基本原理和它們各自的特點(diǎn),通過仿真比較了這三種方案的誤比特率(Bit Error Rate, BER)性能。其次,本論文接著重點(diǎn)探討了光空間調(diào)制(Optical Spatial Modulation, OSM)方案的系統(tǒng)特性,分析了光空間調(diào)制系統(tǒng)的優(yōu)勢和缺陷。針對標(biāo)準(zhǔn)光空間調(diào)制的系統(tǒng)性能在強(qiáng)相關(guān)信道條件下會急劇惡化的缺陷,本文提出了一種新型的廣義光空間調(diào)制(Generalized Optical Spatial Modulation, GOSM)方案,并通過性能仿真驗(yàn)證了廣義光空間調(diào)制在強(qiáng)相關(guān)信道條件下對系統(tǒng)性能的提升。在此基礎(chǔ)上,進(jìn)一步深入分析和討論了光空間調(diào)制系統(tǒng)中空間域星座和信號域星座各自扮演的角色以及它們之間的相互作用。隨后,本論文重點(diǎn)研究了光空間調(diào)制系統(tǒng)中的功率分配(Power Allocation, PA)問題。簡要介紹了在光空間調(diào)制中引入功率分配的基本原理和具體實(shí)現(xiàn)方法,并對幾種常用的功率分配算法進(jìn)行了分析比較。在此基礎(chǔ)上,依據(jù)光空間調(diào)制的系統(tǒng)性能與信號最小歐氏距離之間的關(guān)系,經(jīng)過一定的近似簡化處理,提出一種基于凸優(yōu)化的功率分配方案。相較于常用的光空間調(diào)制功率分配方案,基于凸優(yōu)化的功率分配方案優(yōu)化目標(biāo)更加明確,經(jīng)功率分配后的光空間調(diào)制的系統(tǒng)性能更好,仿真結(jié)果也進(jìn)一步驗(yàn)證了這一結(jié)論。最后,本論文對結(jié)合信道編碼的光空間調(diào)制系統(tǒng)進(jìn)行了討論。對目前空間調(diào)制系統(tǒng)中常用的信道編碼進(jìn)行了介紹,主要包括卷積碼和LDPC碼。以此為基礎(chǔ),進(jìn)一步分析討論了光空間調(diào)制中的比特交織編碼調(diào)制(Bit-Interleaved Coded Modulation, BICM)方案,并給出了基于LDPC碼編碼空間調(diào)制系統(tǒng)的EXIT門限分析方法。此外,論文還對廣義光空間調(diào)制中的信道編碼問題進(jìn)行了分析討論。
[Abstract]:As to the traditional radio frequency communication (Ratio Frequency RF) is an important supplement, visible light communication technology (Visual Light Commu-nications, VLC) in recent years has become a hot research topic in the field of wireless communication. Because every corner of the lighting equipment almost throughout life, through the lighting equipment for wireless communication is an effective and feasible scheme for wireless communication. Compared with the traditional radio frequency communication, visible light communication with energy conservation and environmental protection, green health, high confidentiality, unauthorized rich spectrum resources and a series of advantages. However, the switching speed of LED device with lighting effects, visible light communication system transmission bandwidth, efficient use of spectrum resources of visible light communication system is very important because. The actual lighting system usually adopts a plurality of LED light source array to provide adequate lighting, multiple input multiple output (Multiple Input Multiple Output, MIMO). Transmission scheme has attracted extensive attention and research in visible light communication field. The spatial modulation (Spatial Modulation SM) technology is a kind of modulation mode MIMO transmission technology and traditional digital modulation technology combination, the digital modulation constellation is extended to the traditional spatial dimension, to improve the spectrum efficiency of communication system. The presence of transmitter a plurality of spatially separated spatially modulation system, but at the same time the system allows only one transmitter in the work of the state, so as to realize the transmission of extra bits of information through a number of transmitter work. This modulation scheme by using multiple transmitters to improve the spectrum efficiency of communication system and completely avoid various channels the interference between the transmitter (Inter-Channel Interference, ICI), is well suited for visible light communication system. This paper is mainly on visible light communication In the spatial modulation technique is studied. This paper first makes a general description of the visible light communication system, including system structure, optical transmitter and receiver devices, indoor visible light channel model and common modulation methods. Based on the introduction of three kinds of commonly used MIMO transmission in visible light communication system. Repeat encoding (Repetition Coding, RC (Spatial Multiplexing), spatial multiplexing and spatial modulation, SMP), and analyzes the basic principle of the three MIMO transmission technology and their characteristics, the bit error of the three methods were compared through simulation (Bit Error Rate, BER) performance. Secondly, the then this paper focuses on the spatial light modulation (Optical Spatial, Modulation, OSM) system scheme, analyzes the advantages and disadvantages of space light modulation system. According to the standard optical spatial modulation system performance in strong Defect related channel conditions will worsen sharply, this paper proposes a new generalized optical spatial modulation (Generalized Optical Spatial Modulation, GOSM), and generalized optical spatial modulation in highly correlated channel conditions to enhance system performance is verified by simulation. On this basis, further in-depth analysis and discussion of each other interaction between optical spatial modulation system in spatial domain domain constellation and signal constellation and their respective roles. Then, this paper focuses on the study of power distribution system in optical spatial modulation (Power Allocation, PA). The paper briefly introduces the principle of power distribution in the space light modulation is introduced and the concrete realization method. And several common power allocation algorithms are analyzed and compared. On this basis, according to the system performance and signal the minimum Euclidean distance of optical spatial modulation The relationship between the through approximation will be simplified, proposed a power allocation scheme based on convex optimization. Compared with common optical spatial modulation and power allocation scheme, convex optimization power allocation scheme based on the optimization objectives more clearly, the light modulation of the space power distribution system with better performance, the simulation results also further verified this conclusion. Finally, this paper discusses the spatial light modulation system with channel encoding. The channel encoding commonly used spatial modulation system are introduced, including convolutional codes and LDPC codes. On this basis, further discussed the interleaving encoding modulation optical spatial modulation in bits (Bit-Interleaved Coded Modulation, BICM) scheme, and gives the analysis method of LDPC codes encoding spatial modulation system EXIT based on threshold. In addition, the channel light modulation in generalized space The coding problem is analyzed and discussed.

【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN929.1

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