Orthogonal time-frequency space(OTFS),which exhibits beneficial advantages in high-mobility scenarios,has been considered as a promising technology in future wireless communication systems.In this paper,a universal mo...Orthogonal time-frequency space(OTFS),which exhibits beneficial advantages in high-mobility scenarios,has been considered as a promising technology in future wireless communication systems.In this paper,a universal model for OTFS systems with generalized waveform has been developed.Furthermore,the average bit error probability(ABEP)upper bounds of the optimal maximum likelihood(ML)detector are first derived for OTFS systems with generalized waveforms.Specifically,for OTFS systems with the ideal waveform,we elicit the ABEP bound by recombining the transmitted signal and the received signal.For OTFS systems with practical waveforms,a universal ABEP upper bound expression is derived using moment-generating function(MGF),which is further extended to MIMO-OTFS systems.Numerical results validate that our theoretical ABEP upper bounds are concur with the simulation performance achieved by ML detectors.展开更多
在光敏面上镀制荧光薄膜将紫外光转变为可见光，是提高CCD和CMOS图像传感器紫外响应灵敏度的一种有效方法。针对荧光薄膜入射界面的散射和反射损耗降低荧光发光强度的分析，研究在荧光薄膜上镀制增透膜和阻隔膜的灵敏度增强特性。采用...在光敏面上镀制荧光薄膜将紫外光转变为可见光，是提高CCD和CMOS图像传感器紫外响应灵敏度的一种有效方法。针对荧光薄膜入射界面的散射和反射损耗降低荧光发光强度的分析，研究在荧光薄膜上镀制增透膜和阻隔膜的灵敏度增强特性。采用真空热阻蒸发的镀膜方法分别制备了单层Lumogen荧光薄膜和MgF2/Lumogen复合膜。利用原子力显微镜，紫外可见近红外分光光度计，荧光光谱仪对两种样品的表面粗糙度，漫反射和透射光谱以及荧光发光光谱分别进行对比测试分析。结果表明：M g F2保护层降低了表面粗糙度，减小了入射界面的漫反射损耗，对500～700 nm的可见波段具有明显增透作用，也增强了Lumogen薄膜对紫外波段受激发射的荧光强度；同时，MgF2薄膜的抗损伤及水汽隔离性能对荧光薄膜紫外响应能力具有保护作用，为延长紫外CCD薄膜及器件的工作寿命提供了有效手段。展开更多
基金supported in part by the National Key Research and Development Program of China under Grant 2021YFB2900502the National Science Foundation of China under Grant 62001179the Fundamental Research Funds for the Central Universities under Grant 2020kfyXJJS111。
文摘Orthogonal time-frequency space(OTFS),which exhibits beneficial advantages in high-mobility scenarios,has been considered as a promising technology in future wireless communication systems.In this paper,a universal model for OTFS systems with generalized waveform has been developed.Furthermore,the average bit error probability(ABEP)upper bounds of the optimal maximum likelihood(ML)detector are first derived for OTFS systems with generalized waveforms.Specifically,for OTFS systems with the ideal waveform,we elicit the ABEP bound by recombining the transmitted signal and the received signal.For OTFS systems with practical waveforms,a universal ABEP upper bound expression is derived using moment-generating function(MGF),which is further extended to MIMO-OTFS systems.Numerical results validate that our theoretical ABEP upper bounds are concur with the simulation performance achieved by ML detectors.
文摘在光敏面上镀制荧光薄膜将紫外光转变为可见光，是提高CCD和CMOS图像传感器紫外响应灵敏度的一种有效方法。针对荧光薄膜入射界面的散射和反射损耗降低荧光发光强度的分析，研究在荧光薄膜上镀制增透膜和阻隔膜的灵敏度增强特性。采用真空热阻蒸发的镀膜方法分别制备了单层Lumogen荧光薄膜和MgF2/Lumogen复合膜。利用原子力显微镜，紫外可见近红外分光光度计，荧光光谱仪对两种样品的表面粗糙度，漫反射和透射光谱以及荧光发光光谱分别进行对比测试分析。结果表明：M g F2保护层降低了表面粗糙度，减小了入射界面的漫反射损耗，对500～700 nm的可见波段具有明显增透作用，也增强了Lumogen薄膜对紫外波段受激发射的荧光强度；同时，MgF2薄膜的抗损伤及水汽隔离性能对荧光薄膜紫外响应能力具有保护作用，为延长紫外CCD薄膜及器件的工作寿命提供了有效手段。
