【摘 要】
：
Using directional antennas in Wireless Ad hoc Networks (WANETs) offers great potential of reducing the radio interference,and improving the communication throug
【机 构】
：
Department of Computer Science, University of Tsukuba, Tsukuba Science City3058573, Ibaraki, Japan;F
论文部分内容阅读
Using directional antennas in Wireless Ad hoc Networks (WANETs) offers great potential of reducing the radio interference,and improving the communication throughput.Directional antennas,however,introduces new problems in the wireless Media Access Control (MAC),that is,the deafness and new hidden terminal problem,which may cause severe performance degradation.To solve the problems,we propose an effective Circular RTR Directional MAC (CRDMAC) protocol for WANETs by using a sub-transmission channel and Ready to Receive (RTR) packets,which modifies the IEEE 802.11 Distributed Coordinated Function (DCF).The sub-channel avoids collisions to other ongoing transmission,and the RTR packets notify the neighbor nodes that the mutual transmission has been finished.We evaluate the CRDMAC protocol through simulations and the results show that the proposed protocol outperforms existing DMAC (directional MAC) protocol and the CRCM (Circular RTS and CTS MAC) protocol in terms of throughput and packet drop rate.
其他文献
现代经济学中,产品差别是指同一种产品在质量、品牌、包装、形式、服务等方面的优势差别.差别化是企业竞争战略的一种重要形式,其特征是为了满足顾客需要,形成自身竞争优势,
Considering the Gaussian asymptotic features of OFDM signals,the identification method of it is proposed in this paper by using the cumulants of the wavelet tra
1 摩擦由来已久 自从去年11月国美收购永乐以来，连锁渠道的寡头垄断趋势更加一发不可收拾。从目前状况看，苏宁收购大中应该只是时间问题。 除了横向合并，纵向的市场延伸也在继续。除了强化在一线市场的垄断地位外，国美和苏宁两大寡头都将目标放到二、三级市场：目前国美的店面数已经达到900家以上，正在向1000家目标迈进；而截至今年第一季度苏宁电器的店面数已达到375家，一线市场的布局基本完成，正向
请下载后查看，本文暂不支持在线获取查看简介。
Please download to view, this article does not support online access to view profile.
2008年6月23日,“ITinONE”企业信息一体化解决方案--ORRIS新品发布会在北京香格里拉大酒店隆重举行,欧瑞斯信息科技(上海)有限公司(以下简称ORRIS)正式推出了MSP-Simplex新
教学设计是指教师对即将讲授的课题所进行的有针对性的总体构思,是教师对教学过程中的各种因素、各个环节的预先计划。教学设计比传统备课更注意将先进的教育教学理念和具体
在海上画坛及中国画界,上海市文史研究馆馆员、上海美术学院教授黄阿忠先生早已遐迩闻名。作为一个勤于探索、进取心极强的画家,其创作的触角延伸广远。开始是油画,进而是中
苏联教育学家马卡连柯说:“游戏在儿童生活中具有极其重要的意义,具有与成人活动、工作和劳动同样意义。而区域活动则成为幼儿一种自我学习、自我探索、自我发现、自我完善的
要走好群众路线,确保党的群众路线教育实践活动取得实效,就不能仅止步于完成“规定动作”,还必须结合行业和企业实际,选准并做好“自选动作”.石油和化工行业要想切实解决行