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一种集成了5kHz和25kHzDAMA操作的新分层协议:UHF DMAM标准改进建议
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《电信技术研究》 2000年第8期40-47,共8页
联合超高频(UHF)军事卫星通信(MILSATCOM)技术工作组(TWG)正在开发一种单一集成波形,该波形将对目前需要工作在5kHz和25kHz UHF军事卫星信道上的两种按需分配多址(DAMA)波形进行重要改进。该... 联合超高频(UHF)军事卫星通信(MILSATCOM)技术工作组(TWG)正在开发一种单一集成波形,该波形将对目前需要工作在5kHz和25kHz UHF军事卫星信道上的两种按需分配多址(DAMA)波形进行重要改进。该集成波莆将在两个现有标准的修改版中定义。修改后的每个标准将分别涵盖集成波形的不同协议层,低层标准将定义到操作原则、纠错码和访问卫星信道所需的多址协议; 展开更多
关键词 UHF 分层协议 卫星通信 DAMA 集成波形
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软件无线电技术及其发展 被引量:10
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作者 李晓陆 余翔 王琳 《移动通信》 2009年第20期13-17,共5页
文章简要阐述了软件无线电的特点及其发展历程,重点分析了推动美军联合战术无线通信系统(JTRS)发展的关键要素及其主要技术,最后给出了软件无线电未来发展的构想。
关键词 软件无线电 SCA JTRS 波形集成开发环境
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Structure optimization of polymeric Mach-Zehnder rib waveguide 被引量:1
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作者 LU Rong-guo LIU Yong-zhi LIAO Jin-kun LIAO Yi-tao HAN Wen-jie 《Optoelectronics Letters》 EI 2007年第1期40-42,共3页
A systematic analysis of the polymeric Mach-Zehnder rib waveguide is presented based on the calculation and optimization. The simulation is carried out with the Effective Index Method (EIM) and two-dimensional (2-D) F... A systematic analysis of the polymeric Mach-Zehnder rib waveguide is presented based on the calculation and optimization. The simulation is carried out with the Effective Index Method (EIM) and two-dimensional (2-D) Finite Difference Beam Propagation Method (FD-BPM). The large refractive index step between the consecutive polymer layers is reduced by using EIM and thus the precision of the calculation is ensured. The important param- eters of the waveguide such as Y-junction angle and the separation gap are discussed and their relationships with the optical power propagation and the loss characteristics are investigated in this paper. The total loss of the opti- mized structure is 0.258 dB. 展开更多
关键词 聚合物材料 Mach-Zehnder条形波导 结构优化 集成光波导器件
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Subwavelength grating devices in silicon photonics 被引量:5
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作者 Junjia Wang Ivan Glesk Lawrence R.Chen 《Science Bulletin》 SCIE EI CAS CSCD 2016年第11期879-888,共10页
Subwavelength grating(SWG) waveguides in silicon-on-insulator are emerging as an enabling technology for implementing compact, high-performance photonic integrated devices and circuits for signal processing and sensin... Subwavelength grating(SWG) waveguides in silicon-on-insulator are emerging as an enabling technology for implementing compact, high-performance photonic integrated devices and circuits for signal processing and sensing applications. We provide an overview of our recent work on developing wavelength selective SWG waveguide filters based on Bragg gratings and ring resonators, as well as optical delay lines. These components increase the SWG waveguide component toolbox and can be used to realize more complex photonic integrated circuits with enhanced or new functionality. 展开更多
关键词 Subwavelength gratings Siliconphotonics Integrated optics - Bragg gratings Ringresonators Optical delay lines
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