Outage probability of multihop free space optical communications over nakagami fading channels

Xuan Tang, Zhengyuan Xu, Zabih Ghassemlooy
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引用次数: 5

Abstract

In this paper, the end-to-end outage probability of a multihop free space optical (FSO) communication system over N independent Nakagami fading relay channels are analyzed. We assume that the channel state information-based relays have the knowledge of the channel states in the preceding hops. The Laplace transform of the inverse end-to-end signal-to-noise ratio (SNR) is derived in a closed form. Based on this expression, the outage probability involving N statistically independent, but not necessarily identically distributed (i.n.i.d) Nakagami relay channels is evaluated numerically via the inverse Laplace transform. The results indicate that the outage probability improves as N decreases and/or the arbitrary fading parameter m increases. This is because the probability that any of the cascaded fading channels is in deep fade decreases significantly. Therefore, the smaller N and/or larger m, the better the multihop relay channel.
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中上衰落信道上多跳自由空间光通信的中断概率
本文分析了基于N个独立中上衰落中继信道的多跳自由空间光通信系统的端到端中断概率。我们假设基于信道状态信息的中继知道前一跳中的信道状态。反向端到端信噪比(SNR)的拉普拉斯变换以封闭形式导出。基于该表达式,通过拉普拉斯逆变换对N个统计无关但不一定同分布(i.n.i.d)的中川中继信道的中断概率进行了数值计算。结果表明,随着N的减小和/或任意衰落参数m的增大,中断概率提高。这是因为任何级联衰落信道处于深度衰落的概率显著降低。因此,N越小和/或m越大,多跳中继信道越好。
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