【摘要】：LED燈具有壽命長、節(jié)能環(huán)保的特點，是下一代的主要照明光源。而用其進行通信的可見光通信也受到越來越多人的關注。本文主要是圍繞可見光通信的調(diào)光和數(shù)據(jù)調(diào)制來展開研究的。 首先，簡要介紹了可見光通信系統(tǒng)的組成及特點。分析了可見光通信中發(fā)射端到接收端的鏈路模型，即可概括為直射視距鏈路和漫反射鏈路。并詳細敘述了這兩個信道鏈路的數(shù)學模型及系統(tǒng)的信噪比。 其次，本文詳細分析了可見光通信中的調(diào)光和數(shù)據(jù)傳輸方案。最常做的是用脈沖寬度調(diào)制來調(diào)光，再與其他的數(shù)據(jù)調(diào)制方案結合，從而滿足人們用LED燈同時來照明和通信的要求。因為這種方案需額外的PWM來調(diào)光，所以大大增加了系統(tǒng)的復雜度。另一種方法是用子載波脈沖位置調(diào)制，改變調(diào)制深度來調(diào)光，但其需要高頻子載波來來傳輸數(shù)據(jù)。最后是有別于以上兩種方法的速率可變的多脈沖位置調(diào)制，它用一種調(diào)制方案就能同時實現(xiàn)調(diào)光和傳輸數(shù)據(jù)�？梢哉f，多脈沖位置調(diào)制在可見光通信中有天然的優(yōu)勢。 最后，基于多脈沖位置調(diào)制在可見光通信中的獨有的優(yōu)勢，重點研究其誤碼率、帶寬功率需求。由于仿真發(fā)現(xiàn)MPPM的誤碼率相對于PPM較高，于是，接下來提出了減小MPPM誤碼率，提高其可靠性的改進方案，即間隔多脈沖位置調(diào)制方案。并設計出間隔多脈沖位置調(diào)制的兩種添加保護間隔的方法，即最小時隙法和最小BER法。經(jīng)過分析并仿真兩種方法下系統(tǒng)的誤碼率、帶寬功率需求，結果表明，兩種方法較MPPM誤碼率都降低了許多，相對PPM也都有較好的抑制碼間干擾的能力。只是最小時隙法更適合用于信源比特較小的情況，而最小BER法更為靈活，，應用范圍更廣。
[Abstract]:LED lamps have the characteristics of long life, energy saving and environmental protection, and are the main lighting source of the next generation. More and more people pay attention to the visible light communication. This paper focuses on the dimming and data modulation of visible light communication. Firstly, the composition and characteristics of visible light communication system are introduced briefly. The link model from transmitter to receiver in visible light communication is analyzed, which can be summarized as direct line-of-sight link and diffuse reflection link. The mathematical model of the two channel links and the signal-to-noise ratio of the system are described in detail. Secondly, the scheme of dimming and data transmission in visible light communication is analyzed in detail. The most common thing to do is to use pulse width modulation to dimming light and then combine it with other data modulation schemes to meet the requirements of both lighting and communication using LED lights at the same time. The complexity of the system is greatly increased because the additional PWM is required for this scheme. Another method is to modulate the position of the subcarrier pulse to change the modulation depth, but it needs the high frequency subcarrier to transmit the data. Finally, the multi-pulse position modulation, which is different from the above two methods, can realize dimming and transmitting data simultaneously with one modulation scheme. It can be said that multi-pulse position modulation has a natural advantage in visible light communication. Finally, based on the unique advantages of multi-pulse position modulation in visible light communication, the BER and bandwidth power requirements are studied. Because the simulation results show that the bit error rate (BER) of MPPM is higher than that of PPM, an improved scheme to reduce the BER and improve the reliability of MPPM is proposed. Two methods of adding protection interval to multi-pulse position modulation are designed, that is, the minimum slot method and the minimum BER method. The BER and bandwidth power requirements of the two methods are analyzed and simulated. The results show that the BER of the two methods is much lower than that of MPPM, and that the BER of the two methods is better than that of PPM. However, the minimum time slot method is more suitable for small source bits, while the minimum BER method is more flexible and more widely used.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.1

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