利用HDSS(Hybrid Dynamic Spectrum Sharing)、免CI(Common Public Radio Interface)互联、多网络制式共模等技术,研究2.1G频段部署的TCO(Total Cost of Ownership)最优方案,在不新增RRU和天馈资源的前提下,既保障3G、4G网络用户感知不...利用HDSS(Hybrid Dynamic Spectrum Sharing)、免CI(Common Public Radio Interface)互联、多网络制式共模等技术,研究2.1G频段部署的TCO(Total Cost of Ownership)最优方案,在不新增RRU和天馈资源的前提下,既保障3G、4G网络用户感知不下降,又部署了5G网络,提升频谱资源利用效率,节约站点建设和维护成本。5G用户可以使用40MHz连续大带宽频谱,4G用户通过与5G实时动态共享的方式使用20MHz带宽,技术支持灵活配置资源比例,真正做到平滑演进,为移动网络用户提供更优质的服务。展开更多
Holographic data storage system （HDSS） has been a good candidate for a volumetric recording technology, due to their large storage capacities and high transfer rates, and have been researched for tens of years after...Holographic data storage system （HDSS） has been a good candidate for a volumetric recording technology, due to their large storage capacities and high transfer rates, and have been researched for tens of years after the principle of holography was first proposed. However, these systems, called conventional 2-axis holography, still have essential issues for commercialization of products. Collinear HDSS, in which the information and reference beams are modulated co-axially by the same spatial light modulator （SLM）, as a new read/write method for HDSS are very promising. With this unique configuration, the optical pickup can be designed as small as DVDs, and can be placed on one side of the recording media （disc）. In the disc structure, the preformatted reflective layer is used for the focus/tracking servo and reading address information, and a dichroic mirror layer is used for detecting holographic recording information without interfering with the preformatted information. A 2-dimensional digital page data format is used and the shift-multiplexing method is employed to increase recording density. As servo technologies are being introduced to control the objective lens to be maintained precisely to the disc in the recording and reconstructing process, a vibration isolator is no longer necessary. Collinear holography can produce a small, practical HDSS more easily than conventional 2-axis holography. In this paper, we introduced the principle of the collinear holography and its media structure of disc. Some results of experimental and theoretical studies suggest that it is a very effective method. We also discussed some methods to increase the recording density and data transfer rates of collinear holography.展开更多
文摘利用HDSS(Hybrid Dynamic Spectrum Sharing)、免CI(Common Public Radio Interface)互联、多网络制式共模等技术,研究2.1G频段部署的TCO(Total Cost of Ownership)最优方案,在不新增RRU和天馈资源的前提下,既保障3G、4G网络用户感知不下降,又部署了5G网络,提升频谱资源利用效率,节约站点建设和维护成本。5G用户可以使用40MHz连续大带宽频谱,4G用户通过与5G实时动态共享的方式使用20MHz带宽,技术支持灵活配置资源比例,真正做到平滑演进,为移动网络用户提供更优质的服务。
文摘Holographic data storage system （HDSS） has been a good candidate for a volumetric recording technology, due to their large storage capacities and high transfer rates, and have been researched for tens of years after the principle of holography was first proposed. However, these systems, called conventional 2-axis holography, still have essential issues for commercialization of products. Collinear HDSS, in which the information and reference beams are modulated co-axially by the same spatial light modulator （SLM）, as a new read/write method for HDSS are very promising. With this unique configuration, the optical pickup can be designed as small as DVDs, and can be placed on one side of the recording media （disc）. In the disc structure, the preformatted reflective layer is used for the focus/tracking servo and reading address information, and a dichroic mirror layer is used for detecting holographic recording information without interfering with the preformatted information. A 2-dimensional digital page data format is used and the shift-multiplexing method is employed to increase recording density. As servo technologies are being introduced to control the objective lens to be maintained precisely to the disc in the recording and reconstructing process, a vibration isolator is no longer necessary. Collinear holography can produce a small, practical HDSS more easily than conventional 2-axis holography. In this paper, we introduced the principle of the collinear holography and its media structure of disc. Some results of experimental and theoretical studies suggest that it is a very effective method. We also discussed some methods to increase the recording density and data transfer rates of collinear holography.
