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提出了一种结合副载波强度调制直接探测技术和全光放大转发中继的自由空间光通信(FSO)系统的基本结构,考虑背景噪声和放大自发辐射噪声对系统性能的影响,建立了Gamma-Gamma湍流模型下的全光通信系统模型。提出了两种中继协作方案,即全活跃中继方案与选择中继方案,基于相应的方案给出功率分配方式,仿真对比了中继辅助传输链路与直传链路的中断概率,以及在不同信道参数及中继数下采用这两种方案的系统中断概率。结果表明,中继传输能够明显改善链路的性能,选择中继方案优于全活跃中继方案。
This paper presents a basic structure of a free-space optical communication (FSO) system combining direct detection of subcarrier intensity modulation with all-optical amplification and repeater relay. Considering background noise and amplification of spontaneous emission noise on system performance, a Gamma- All - optical communication system model under Gamma turbulence model. Two kinds of trunking schemes are proposed, that is, full-active trunking scheme and selective trunking scheme. The power allocation mode is given based on the corresponding schemes. The probability of interrupting between the secondary and direct links is simulated. The system interruption probability of these two schemes is adopted under different channel parameters and relay numbers. The results show that the relay transmission can significantly improve the performance of the link, and the relay selection scheme is superior to the all-active relay scheme.