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交调失真影响下星间微波光子链路接收灵敏度优化

Receiver Sensitivity Optimization of Intersatellite Microwave Photonics Link Considering the Effect of Intermodulation Distortion

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摘要

高输入信号功率时的交调失真是降低星间微波光子链路接收灵敏度的主要因素。考虑输入N路四相相移键控(QPSK)调制信号的情形,建立了强度调制/直接检测(IM/DD)星间微波光子链路模型。利用傅里叶级数展开、傅里叶变换/逆傅里叶变换和Graf加法定理,推导出了接收信号任意谐波和交调分量的解析表达式,在确定三阶交调失真个数的基础上,得到了接收光功率与信号噪声失真比(SNDR)之间的关系。着重分析了不同调制方式下链路接收灵敏度与信道数和调制系数之间的关系。当调制系数较小时,接收灵敏度对信道数变化不敏感。随着调制系数的增大,接收灵敏度先增大后减小,存在最佳的调制系数可以使链路接收灵敏度最高。

Abstract

The intermodulation distortion greatly deteriorates the receiver sensitivity of intersatellite microwave photonics link in the range of high input signal power. The situation of N quadrature phase shift keying (QPSK) modulation signal input is considered and the intensity modulation/direct detection (IM/DD) intersatellite microwave photonics link model is presented. An exact analytical solution for any harmonic and intermodulation components of receiver signal is deduced with the method of Fourier expansion, Fourier transform/inverse Fourier transform and Graf addition theory. Combined with the number of third-order intermodulation distortion, the relationship formula between receiver optical power and signal-to-noise and distortion ratio (SNDR) is derived. The analysis concentrates on the relationship between receiver sensitivity of intersatellite microwave photonic link and the number of channels, the modulation index under different modulation modes. When the modulation index is small, the receiver sensitivity is robust against the change of channel number. The receiver sensitivity increases and then decreases as the increase in modulation index. It shows that an optimum modulation index can maximize the receiver sensitivity of link.

广告组1 - 空间光调制器+DMD
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中图分类号:TP393.03

DOI:10.3788/aos201232.0906002

所属栏目:光纤光学与光通信

责任编辑:韩峰  信息反馈

基金项目:国家863计划(2007AA01Z294)资助课题。

收稿日期:2012-03-05

修改稿日期:2012-04-26

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作者单位    点击查看

朱子行:空军工程大学电讯工程学院, 陕西 西安 710077
赵尚弘:空军工程大学电讯工程学院, 陕西 西安 710077
幺周石:空间微波技术国防科技重点实验室, 陕西 西安 710000
谭庆贵:空间微波技术国防科技重点实验室, 陕西 西安 710000
李勇军:空军工程大学电讯工程学院, 陕西 西安 710077
楚兴春:空军工程大学电讯工程学院, 陕西 西安 710077
赵卫虎:空军工程大学电讯工程学院, 陕西 西安 710077
王翔:空军工程大学电讯工程学院, 陕西 西安 710077
赵顾颢:空军工程大学电讯工程学院, 陕西 西安 710077

联系人作者:朱子行(zhuzihang6@126.com)

备注:朱子行(1985—),男,博士研究生,主要从事星上微波光子方面的研究。

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引用该论文

Zhu Zihang,Zhao Shanghong,Yao Zhoushi,Tan Qinggui,Li Yongjun,Chu Xingchun,Zhao Weihu,Wang Xiang,Zhao Guhao. Receiver Sensitivity Optimization of Intersatellite Microwave Photonics Link Considering the Effect of Intermodulation Distortion[J]. Acta Optica Sinica, 2012, 32(9): 0906002

朱子行,赵尚弘,幺周石,谭庆贵,李勇军,楚兴春,赵卫虎,王翔,赵顾颢. 交调失真影响下星间微波光子链路接收灵敏度优化[J]. 光学学报, 2012, 32(9): 0906002

被引情况

【1】李轩,赵尚弘,张薇,韩磊,赵静. 双频段信号同步调制下星间微波光子链路性能分析. 激光与光电子学进展, 2013, 50(5): 50601--1

【2】李轩,赵尚弘,张薇,韩磊,赵静. 多载波输入时星间微波光子链路性能分析. 光电工程, 2013, 40(4): 86-91

【3】李轩,赵尚弘,朱子行,韩磊,赵静. 星间微波光子链路调制方式的优化. 应用光学, 2013, 34(3): 547-552

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