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Analysis of space diversity method in modulating retro-reflector optical communication
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摘要:
在逆向调制无线光通信系统中，大气湍流对系统的影响大于传统的无线光通信系统。本文研究了一种基于逆向端调制器分集的逆向调制无线光通信系统，以减小大气湍流对系统的影响。利用相位屏法，建立了弱湍流下的激光大气的传输模型，对比分析了逆向调制无线光通信系统逆向端逆向调制器分集和不分集分别所受到的大气湍流的影响。结果显示在相同情况下，逆向调制无线光通信系统在逆向端对逆向调制器进行分集能抑制大气湍流对系统的影响，使整个系统的闪烁指数下降。
Abstract:In the modulating retro-reflector (MRR) communication system, the influence of the atmospheric turbulence on the system is more serious than that of the traditional FSO communication system. In this paper, in order to reduce the impact of the atmospheric turbulence, an improved scheme based on the diversity of the retro-reflector is proposed. Using the power spectrum inversion method, the atmospheric propagation model of MRR under weak turbulence is established. The influence of the atmospheric turbulence on the retro-reflector diversity system and the traditional MRR communication system is compared and analyzed. The results of the numerical analysis show that under the same condition, the retro-reflector diversity of modulating retro-reflector (MRR) communication system can reduce the scintillation index caused by the atmospheric turbulence.
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Overview: Free space optical communications (FSO) has become a hot research topic in the field of optical communications. Compared with the traditional optical fiber communication, the main characteristic of wireless optical communication is to get rid of the optical fiber signal, which can be used in some special occasions. Generally speaking, the advantages of FSO are as follows: the frequency of the optical signal is high enough to avoid interference by the surrounding electromagnetic waves; Enough capacity to transmit at speeds up to a gigabit per second; It has a separate communication band and does not occupy the existing band. The traditional FSO needs to load the laser transmitting/receiving system at both ends, and the complex tracking system needs to be built, which increases the weight, volume, power consumption and technical complexity of the system. Thus they become an important factor restricting the application of FSO. The modulating retro-reflector (MRR) system can eliminate the laser transmitter and the tracking system of a terminal in the communication link. As a consequence; it greatly reduces the weight, volume and power consumption of one end of the link and effectively solves the application limitation of FSO. However, the MRR system is more vulnerable to the atmospheric turbulence than the FSO system. Although so far, there are many literatures on efficiently reducing the atmospheric turbulence, most of them are based on the traditional FSO communication system. In this paper, we build the MRR laser atmospheric propagation model under weak turbulence by using the power spectrum inversion method. Scintillation index is a physical quantity describing the degree of turbulence in the atmosphere. The numerical analyses show that under the same condition and for the diversity of the reverse modulation echo reflection link at a propagation distance of 1000 m, the scintillation index increases continuously as the distance increases, and decreases as the number of sub-sets increases. When the number of modulators is four, the scintillation index is similar to that of the ring-shaped reverse modulator. The more diverse is, the greater the cost is. Therefore, within a kilometer range, it is an ideal solution to select four inverse modulators. With simulation of the four parts diversity model, it is found that with the increase of the distance between antennas, the amplitude of the scintillation index decreases. It is also suggested that increasing the aperture of the reverse-end-modulated end-diversity antenna can also reduce the system scintillation index.
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图 5 逆向端分集闪烁指数对比图
Figure 5. Comparison diagram of scintillation index of reverse end diversity
图 6 不同距离逆向端分集闪烁指数对比图
Figure 6. Comparison diagram of scintillation index of diversity at different distances
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