本文選題：無線激光通信 + 衰減��； 參考：《西安電子科技大學(xué)》2014年碩士論文

【摘要】：自由空間光通信（無線激光通信）具有抗干擾能力強(qiáng)、信息容量大等眾多優(yōu)點(diǎn)，而大氣環(huán)境是影響其傳輸?shù)淖钪饕脑蛑唬瑹o線光通信信道特性研究也是至關(guān)重要的。 本文首先首先研究了各種大氣粒子造成的衰減效應(yīng)，分別討論了激光在對流層大氣傳輸中，氣溶膠、云霧、降雨、大氣湍流等引起的大氣衰減效應(yīng)，預(yù)測了不同能見度的云霧引起的不同波長激光能量的衰減。結(jié)果表明，云霧的衰減一般比氣溶膠的大，隨能見度的降低增加快。其次，利用通信系統(tǒng)中的信噪比和誤碼率模型，計算分析了各種情況下的信噪比和誤碼率，，并利用OOK、DPSK、PSK、PPM等調(diào)制解調(diào)技術(shù)來改善光通信系統(tǒng)性能，得出采用PPM調(diào)制改善系統(tǒng)性能最具優(yōu)勢。然后，應(yīng)用給出的閃爍指數(shù)模型分別預(yù)測了不同湍流強(qiáng)度、不同路徑天頂角及不同波束半徑下閃爍指數(shù)的結(jié)果，進(jìn)一步分析了，在地-空路徑下，考慮大氣湍流影響情況下的系統(tǒng)信道容量和中斷概率。通過仿真計算分析了在對數(shù)正態(tài)分布和Gamma-Gamma分布下平均容量和中斷概率的變化趨勢。最后，從大氣信道方面介紹了提高無線光通信系統(tǒng)性能的有效方法，對未來的發(fā)展和研究具有一定的指導(dǎo)意義。
[Abstract]:Free space optical communication (wireless laser communication) has many advantages, such as strong anti-jamming ability, large information capacity and so on. The atmospheric environment is one of the most important factors affecting its transmission, and the research on the channel characteristics of wireless optical communication is also very important. In this paper, the attenuation effects caused by various atmospheric particles are studied, and the atmospheric attenuation effects caused by aerosols, clouds, rainfall and atmospheric turbulence in the tropospheric atmosphere are discussed respectively. The attenuation of laser energy at different wavelengths caused by cloud and fog with different visibility is predicted. The results show that the attenuation of cloud and mist is larger than that of aerosol and increases with the decrease of visibility. Secondly, the signal-to-noise ratio (SNR) and bit error rate (BER) model of the communication system are used to calculate and analyze the SNR and BER in various cases, and the modulation and demodulation techniques such as OOKO / DPSK / PSKPPM are used to improve the performance of the optical communication system. It is concluded that using PPM modulation to improve the performance of the system has the most advantages. Then, the scintillation exponent model is applied to predict the scintillation exponents under different turbulence intensity, different path zenith angle and different beam radius respectively. The channel capacity and interruption probability of the system under the influence of atmospheric turbulence are considered. The variation trend of average capacity and outage probability under logarithmic normal distribution and Gamma-Gamma distribution is analyzed by simulation. Finally, an effective method to improve the performance of wireless optical communication system is introduced from the aspect of atmospheric channel, which has a certain guiding significance for the future development and research.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.12

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