Author Affiliations
Abstract
1 Department of Information Science and Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China
2 School of Physics and Electronics, Hunan Normal University, Changsha 410081, China
To overcome the unbalanced signal-to-noise ratio (SNR) among data-carrying subcarriers (SCs) induced by the imperfect frequency response of optoelectronic devices and various interferences, a channel-independent partial data-carrying SCs precoding (PDSP) method based on orthogonal circular matrix transform (OCT) is proposed and experimentally investigated in an intra-symbol frequency average (ISFA)-enabled discrete multi-tone (DMT) visible light communication (VLC) system. After transmission over 1.9 m free space, at the optimal bias current of 100 mA, the experimental results show that the bit error ratio (BER) performance can be improved by up to an order of magnitude with conventional full data-carrying SCs precoding (FDSP) and PDSP scheme, compared to that without a precoding scheme. Moreover, the BER performance can further be enhanced when the ISFA algorithm with optimal taps is employed. Compared with the FDSP scheme, the proposed PDSP scheme owns a similar BER performance and a significant reduction in required multiplication and addition operations, and it may be a good option to efficiently combat the unbalanced impairments of DMT-VLC transmission systems.
partial data-carrying subcarriers precoding OCT intra-symbol frequency-averaging visible light communication Chinese Optics Letters
2023, 21(2): 020602
1 中国科学院上海技术物理研究所, 上海 200083
2 中国科学院大学, 北京 100049
CCD接收到过强信号时会出现电荷溢出现象，对于无溢出漏级结构的CCD，需合理设置成像系统参数避免出现电荷溢出。针对滨松帧转移型CCD 对非强目标成像时出现的电荷溢出现象，分析其原因是由行读出过程中成像区长时间电荷积累而导致的，通过积分之前的多次帧转移，有效解决了电荷溢出问题，并基于积分球实验进一步论证了原因及解决方法。
光电子学 电荷溢出 成像控制 积分球实验 激光与光电子学进展
2014, 51(8): 080401
1 中国科学院上海技术物理研究所, 上海 200083
2 中国科学院大学, 北京 100049
针对高稳定度遥感器在轨相对定标监测系统关键技术进行研究, 阐述了工作原理和关键技术。 研制了基于可见/短波红外双波段陷阱结构的高稳定度定标探测器组件, 通过选择高灵敏度单元可见和短波红外光电探测器, 一方面使探测器组件工作在线性更好、 暗电流更低的零偏置光伏电路模式, 另一方面使探测器组合成为复合型陷阱光机探测模式, 并在模拟前放电路和数据采集环节进行了关键参数设计, 完成了星载定标辐射源输出辐射的高稳定度相对定标监测系统设计。 通过实验室内积分球以及国家计量技术机构提供的标准灯的辐射测试结果表明, 系统获取的码值相对标准方差达到0.030%～0.046%(可见通道)和0.040%～0.059%(短波红外通道), 实现了相对定标系统的高稳定度监测, 为未来遥感器在轨相对定标提供一种优良的解决方案。
在轨定标 可见/近红外陷阱探测 高稳定度监测 In-orbit calibration Vis/SWIR trap detector High stability monitoring
