Performance Analysis of AF Relayed NLOS UV Communication Over Turbulent Channel

Kamal K. Garg, P. Singya, V. Bhatia
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引用次数: 5

Abstract

Ultraviolet (UV) communication experiences strong aerosol and molecular scattering which leads to non-line-of-sight (NLOS) connectivity. As the UV signal propagates through the atmosphere, the change in the refractive index of the atmosphere causes random fluctuations in the transmitted signal, this phenomenon is referred to as turbulence. The effect of atmospheric turbulence in NLOS UV communication link is usually ignored under the assumption of short distance communication. In this paper, we consider a NLOS UV communication system experiencing fading due to atmospheric turbulence and use relay-assisted transmission for improved connectivity. We present performance analysis of dual-hop amplify-and-forward (AF) relayed outdoor NLOS UV communication and derive closed-form expressions for the outage probability, average symbol error rate, ergodic capacity and relative diversity order. Analytical expressions using two different approximations are compared and validated with simulations.
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湍流信道上AF中继NLOS紫外通信性能分析
紫外线(UV)通信经历强烈的气溶胶和分子散射,导致非视距(NLOS)连接。当紫外信号在大气中传播时,大气折射率的变化会引起传输信号的随机波动,这种现象被称为湍流。在短距离通信的假设下,大气湍流对NLOS紫外通信链路的影响通常被忽略。在本文中,我们考虑了由于大气湍流而经历衰落的NLOS UV通信系统,并使用中继辅助传输来改善连通性。本文对双跳放大转发(AF)中继室外NLOS UV通信进行了性能分析,并推导出中断概率、平均码误差率、遍历容量和相对分集顺序的封闭表达式。对两种不同近似的解析表达式进行了比较,并通过仿真进行了验证。
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