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论文作者:英语论文论文属性:作业 Assignment登出时间:2016-03-23编辑:cari2点击率:19796
论文字数:8632论文编号:org201603181350499330语种:英语 English地区:澳大利亚价格:免费论文
摘要:本文主要介绍了WiMAX技术,它能提供更好的服务质量,创造高性能的架构,在得到全球监管机构的认可下,会成为下一个大事件。
The second revision for the IEEE standard 802.16-2001 is IEEE standard 802.16a-2003. It supports working at the 2-11 GHz frequencies, both licensed and license-exempt bands. The standard improves PMP MAC and defines new PHY specifications. By MAC functionality, the standard introduces a number of features, such as a specific quality of service (QoS) to optimize data, video, and voice services, Automatic Retransmission Request (ARQ) to get better end-to-end performance. The MAC in addition defines optional Mesh mode which enables every node to directly connect to others through multipoint-to-multipoint air interface and as a result extends the coverage of communication. Because low frequencies have capability to penetrate barriers, the IEEE 802.16a standard can function in near LOS and NLOS environments enabled by the new PHY functionality[21].
2.6.4 IEEE Std 802.16-2004
The revision and consolidation of the IEEE standard 802.16-2001, the IEEE standard 802.16a-2003, and the IEEE standard 802.16c-2002 is IEEE standard 802.16-2004. It is intended for both licensed and un-licensed frequencies. In 10 to 66 GHz bands, it requires LOS environment, whereas, in frequencies below 11 GHz, it provides the facility to support NLOS environment. The MAC supports both PMP and Mesh modes[21].
2.6.5 IEEE standard 802.16f-2005
The revision of the IEEE standard 802.16-2004 is IEEE standard 802.16f-2005. It defines a mana本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。