基于QAM的X射线通信系统性能改善方法  

Performance Improving Method of X-Ray Communication System Based on QAM

作　　者：王润 薛凤凤[1] 薛阳[1] 林俊龙 李娜[1] Wang Run;Xue Fengfeng;Xue Yang;Lin J unlong;Li Na(Information and Navigation College,Air Force Engineering University,Xi'an,Shaanxi 710077,China;The 93575 Unit,Chengde,Hebei 067000,China)

机构地区：[1]空军工程大学信息与导航学院 [2]93575部队

出　　处：《激光与光电子学进展》2019年第6期251-256,共6页Laser & Optoelectronics Progress

摘　　要：针对复杂深空通信环境对X射线通信系统抗噪声性能的影响,提出一种基于正交振幅调制(QAM)的误码率优化模型。通过分析实际通信环境中的噪声来源,并结合现有的X射线通信链路模型,给出主要噪声来源的数学表达式;基于泊松分布模型,建立QAM方式下强度调制直接检测(IM/DD)系统中通信误码率的计算模型,并通过模拟仿真验证其有效性。仿真结果表明,该模型的误码率可降至10^(-6)量级,与现有的二进制启闭键控(OOK)和脉冲位置调制(PPM)方法相比,当接收到相同的光子数时,该模型所需发射的光子数更少,尤其是当通信系统处于噪声干扰强度极不稳定的环境中时,该模型更具优势。Aiming at the influence of the complicated deep-space communication environment on the anti-noise performance of X-ray communication system, a bit error rate optimization model is proposed based on quadrature amplitude modulation (QAM). The mathematical expression of the primary noise source is derived through analyzing the noise source in actual communication scenario combined with an existing X-ray communication link model. On the basis of Poison distribution model, the calculation model of the communication error rate in intensity modulation direct detection (IM/DD) system is established under the QAM mode, and its effectiveness is verified by simulation. The simulation result shows that the bit error rate of QAM system can be reduced to 10-6 orders of magnitude.When the same amount of photons are received, the proposed method launched less photons compared with the existing binary on-off keying (OOK) and pulse position modulation (PPM) methods. Furthermore, this proposed method is suitable for the modulation of the space X-ray communication system when it is deployed in the environment with an unstable noise intensity.

关 键 词：X射线通信 正交振幅调制 功率方程 误码率 

分 类 号：TN927[电子电信—通信与信息系统]