HAP-GEO-HAP全光中继放大链路模型及其误码性能

针对几何传播损耗和指向误差联合效应对空间激光链路性能的影响, 研究了HAP-GEO-HAP全光中继放大链路通信模型的误码性能。建立了基于GEO卫星全光中继放大转发的高空平台激光链路通信模型, 在考虑背景光辐射与放大器引入的自发辐射等因素的条件下, 研究了信道衰减系数的统计特性和各类噪声的强度, 获得链路模型的Q因子, 推导出误码率表达式。仿真分析了在不同发射功率、抖动标准差和波束宽度等参数条件下, 链路误码率与比特速率的关系。研究结果表明: 当比特速率较低时, 增大发射功率、降低抖动标准差或减小波束宽度, 对链路误码率性能的改善程度较为明显; 当比特速率大于4 Gbps时, 上述措施对链路误码性能的改善程度较为缓慢。

Abstract

Aiming at the combined effects of geometric spreading and pointing errors on space optical links, the bit error rate (BER) performance of the all-optical amplify-and-forward(AOAF) relaying high altitude platform(HAP)-GEO-HAP communication links was researched. The GEO-based satellite AOAF relaying HAP optical communication link was modeled. The statistical characteristics of the channel fading index and the strength of the noises were investigated when the background radiation and the amplified spontaneous emission(ASE) noises were considered. With the help of the obtained Q factor of the proposed link model, the expression of BER was theoretically derived. The relationship between the BER performance and the bit rate under different parameters such as the transmitted optical power, jitter standard deviation and the beam-width was analyzed by simulation. The results show that, the BER performance is obviously improved by increasing the transmitted optical power, reducing the jitter standard deviation or decreasing the beam-width when the bit rate is low. On the other hand, a slight improvement of the BER performance is obtained with the same measures when the bit rate is larger than 4 Gbps.

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丁西峰, 马赛, 赵尚弘, 王翔, 郑永兴, 温泉, 林涛. HAP-GEO-HAP全光中继放大链路模型及其误码性能[J]. 红外与激光工程, 2017, 46(6): 0622003. Ding Xifeng, Ma Sai, Zhao Shanghong, Wang Xiang, Zheng Yongxing, Wen Quan, Lin Tao. BER performance and link model of HAP-GEO-HAP all-optical amplify-and-forward relaying[J]. Infrared and Laser Engineering, 2017, 46(6): 0622003.

HAP-GEO-HAP全光中继放大链路模型及其误码性能

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