LTE(Long Term Evolution,长期演进)项目是3G的演进,始于2004年3GPP的多伦多会议。LTE并非人们普遍误解的4G技术,而是3G与4G技术之间的一个过渡,是3.9G的全球标准。它改进并增强了3G的空中接入技术,采用单载波频分多址和虚拟多入多出作...LTE(Long Term Evolution,长期演进)项目是3G的演进,始于2004年3GPP的多伦多会议。LTE并非人们普遍误解的4G技术,而是3G与4G技术之间的一个过渡,是3.9G的全球标准。它改进并增强了3G的空中接入技术,采用单载波频分多址和虚拟多入多出作为其无线网络演进的唯一标准。因此,本文针对这两种技术标准进行系统的阐述。展开更多
Employing cooperative communication in multihop wireless sensor networks provides the network with significant energy efficiency. However, the lifetime of such a network is directly dependant upon the lifetime of each...Employing cooperative communication in multihop wireless sensor networks provides the network with significant energy efficiency. However, the lifetime of such a network is directly dependant upon the lifetime of each of its individual sections (or clusters). Ignoring the fact that those sections close to sink have to forward more data (their own data plus the data received from the previous sections) and hence die sooner with considering equal section sizes, leads to a sub-optimal lifetime. In this paper, we optimize the section sizes of a multihop cooperative WSN so that it maximizes the network lifetime. Simulation results demonstrate a significant lifetime enhancement for the proposed optimal sectoring.展开更多
文摘LTE(Long Term Evolution,长期演进)项目是3G的演进,始于2004年3GPP的多伦多会议。LTE并非人们普遍误解的4G技术,而是3G与4G技术之间的一个过渡,是3.9G的全球标准。它改进并增强了3G的空中接入技术,采用单载波频分多址和虚拟多入多出作为其无线网络演进的唯一标准。因此,本文针对这两种技术标准进行系统的阐述。
文摘Employing cooperative communication in multihop wireless sensor networks provides the network with significant energy efficiency. However, the lifetime of such a network is directly dependant upon the lifetime of each of its individual sections (or clusters). Ignoring the fact that those sections close to sink have to forward more data (their own data plus the data received from the previous sections) and hence die sooner with considering equal section sizes, leads to a sub-optimal lifetime. In this paper, we optimize the section sizes of a multihop cooperative WSN so that it maximizes the network lifetime. Simulation results demonstrate a significant lifetime enhancement for the proposed optimal sectoring.
