无线Ad Hoc网络中支持智能天线的TDMA多址接入协议  

TDMA Protocol with Smart Antenna in Wireless Ad Hoc Networks

作　　者：张光辉[1] 李建东[1] 张文柱[1] 周雷[1] 

机构地区：[1]西安电子科技大学ISN国家重点实验室信息科学研究所宽带无线通信实验室,西安710071

出　　处：《计算机科学》2006年第9期21-26,共6页Computer Science

基　　金：国家自然科学基金和微软亚洲研究院联合资助项目(60372048)(大规模宽带无线自适应Ad Hoc网络);高等学校优秀青年教师教学科研奖励计划(英文缩写为"TRAPOYT");国家自然科学基金重大项目60496316(新型载波系统和智能无线媒体接入技术);国家863课题2005AA123910"认知无线电技术研究";教育部科学技术研究重点项目(104171)(大规模宽带无线分布式网络关键技术);高等学校博士学科点专项科研基金(20050701007)。

摘　　要：介绍和分析了无线Ad Hoc网络中自适应波束形成时分多址接入协议ABF-TDMA。ABF-TDMA是基于TDMA和智能天线技术来实现无冲突预约和波束形成,允许每对通信节点在每个时隙预约和训练采保证存在隐藏终端情况下的无冲突的预约和波束形成。成功预约和训练后,数据分组可以以自适应波束形成方式发送。本文分析了在全连通网络下不同分组长度、节点数和重发限制下ABF-TDMA的通过率和时延。仿真结果显示,ABF-TDMA可以获得高通过率、低时延、较小的时延抖动和丢包率,特别是分组长度较长和节点数较多情况下。A novel MAC protocol called adaptive beamforming time division multiple access （ABF-TFMA）for mobile Ad Hoc networks with smart antennas is introduced and analyzed,and is based on TDMA and smart antenna （SA）for collision-free reservation and beamforming, and allows a pair of communicatin nodes to reserve and handshake on every slot to guarantee collision-free reservation and training in the presence of hidden terminals. After successful reservation and training, data packet can be transmitted from source node to destination node with adaptive beamforming. We analyze the throughput and delay of ABF-TDMA for the case of a fully connected network assuming variable-length packets, different number of nodes and retry limit. Simulation results show that ABF-TDMA can achieve high throughput, low delay, small delay jitter and packet loss ratio, especially when the average packet length and number of nodes are large.

关 键 词：时分多址接入 智能天线 自适应波束形成 无线AD Hoc网络 

分 类 号：TN929.5[电子电信—通信与信息系统]