【摘要】：為了克服大氣湍流所造成的信道衰落效應(yīng),分析了在弱湍流信道模型下基于強(qiáng)度檢測脈沖位置調(diào)制方式的自由空間光通信空間(FSO)分集接收系統(tǒng)模型,推導(dǎo)了無分集系統(tǒng)的誤時隙率計(jì)算公式。然后以此作為參考,在獨(dú)立同分布的情況下,采用數(shù)值仿真的方法,分別對比分析了最大比合并(MRC)、等增益合并(EGC)和選擇性合并(SC)的誤時隙率性能。結(jié)果表明,3種合并技術(shù)中,誤時隙率性能改善最優(yōu)的是MRC,其次是EGC,而SC的改善性能最差,但是SC實(shí)現(xiàn)相對容易。利用分集接收合并技術(shù)可以有效改善FSO系統(tǒng)的性能,并且具有較好的抗大氣信道衰落能力,在無線光通信中將有一定的應(yīng)用前景。
[Abstract]:In order to overcome the channel fading effect caused by atmospheric turbulence, the free-space optical communication space (FSO) diversity receiving system model based on intensity detection pulse position modulation is analyzed in the weak turbulent channel model. The calculation formula of false time slot rate for diversity free system is derived. Then, under the condition of independent and same distribution, the performance of maximum ratio combination (MRC), equal gain combination (EGC) and selective combination (SC) are compared and analyzed by numerical simulation. The results show that MRC is the best, EGC is the second, and SC is the worst, but SC is relatively easy to implement. The performance of FSO system can be improved effectively by using diversity reception and combining technology, and it has better anti-fading ability of atmospheric channel, so it will have a certain application prospect in wireless optical communication.
【作者單位】： 南通大學(xué)電子信息學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(61371113) 交通運(yùn)輸部應(yīng)用基礎(chǔ)研究資助項(xiàng)目(2013-319-825-110) 江蘇省普通高校研究生科研創(chuàng)新計(jì)劃資助項(xiàng)目(CXZZ13-0869) 南通大學(xué)研究生科技創(chuàng)新計(jì)劃項(xiàng)目資助(YKC13001)
【分類號】：TN929.12
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本文編號：2137235