【摘要】：作為一種未來的室內無線寬帶接入方案,可見光通信(VLC)與紅外通信以及射頻通信相比有其獨特的優(yōu)勢。首先,它的帶寬很寬,能夠實現(xiàn)更高的通信速率,可輕易達到每秒幾十兆甚至幾百兆,且光譜無需授權。其次,可以直接利用LED照明燈具作為光發(fā)射機,因此具有極高的成本優(yōu)勢,另外它對人體不會造成輻射損害,也具有更好的保密性能。目前可見光通信技術得到了越來越多的國家的重視,特別是日本、歐洲和美國。中國的各大院校和研究機構也相繼展開了有關的研究,并開始取得一定的成果。 本文首先分析了可見光通信的基本特性、基本構成和應用場景,介紹了各國對可見光通信技術的研究現(xiàn)狀,歸納了可見光通信系統(tǒng)的關鍵技術與發(fā)展趨勢。然后比較了傳統(tǒng)射頻MIMO與可見光MIMO的實質性差異,對室內可見光MIMO的信道特性進行了研究,并將之應用到Simulink通信系統(tǒng)中分析了其誤碼率曲線。 本文主要的研究內容包括：以普通室內場景為典型應用目標,對可見光SISO、2×2MIMO、4×4MIMO系統(tǒng)的多徑信道特性進行了仿真分析；其中對可見光的4×4MIMO信道模型進行了特別細致的分析,并選取矩形排列和直線型兩種有代表性的光發(fā)射機排列方式進行分析對比；建立了Simulink系統(tǒng)模型進行仿真,分析了在應用了多徑信道后SISO、2×2MIMO、4×4MIMO三類系統(tǒng)的性能表現(xiàn),得出三者的誤碼率曲線；分析了在分別采用迫零均衡、最大似然均衡、最大似然均衡+后向反饋三種不同方法時4×4MIMO系統(tǒng)的信噪比(SNR)與誤碼率關系。
[Abstract]:As a future indoor wireless broadband access scheme, visible light communication (VLC) has its unique advantages compared with infrared communication and radio frequency communication. First, it has a wide bandwidth, can achieve higher communication rates, can easily reach tens of megabytes per second or even hundreds of megabytes per second, and the spectrum does not require authorization. Secondly, LED lighting can be directly used as optical transmitter, so it has a high cost advantage, in addition, it will not cause radiation damage to the human body, but also has a better security performance. At present, visible light communication technology has been paid more and more attention by more and more countries, especially Japan, Europe and the United States. China's universities and research institutions have also launched the relevant research, and began to achieve certain results. In this paper, the basic characteristics, basic structure and application scene of visible light communication are analyzed, and the research status of visible light communication technology in various countries is introduced, and the key technology and development trend of visible light communication system are summarized. Then, the differences between traditional RF MIMO and visible light MIMO are compared, and the channel characteristics of indoor visible light MIMO are studied and applied to Simulink communication system to analyze the BER curve. The main contents of this paper are as follows: taking ordinary indoor scenes as typical application targets, the multipath channel characteristics of visible light SISO2 脳 2MIMO4 脳 4MIMO system are simulated, and the 4 脳 4MIMO channel model of visible light is analyzed in detail. Two typical optical transmitter arrangement modes, rectangular arrangement and linear type, are selected for analysis and comparison, Simulink system model is established for simulation, and the performance of SISO2 脳 2MIMO-4 脳 4MIMO system after the application of multipath channel is analyzed. The error rate curves of the three systems are obtained, and the relationship between SNR (SNR) and bit error rate of 4 脳 4MIMO system is analyzed under three different methods of zero forcing equalization and maximum likelihood equalization backward feedback.
【學位授予單位】：華東理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN919.3

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