有效支持智能天线在移动Ad Hoc网络中应用的多址接入协议  

A novel MAC protocol for the mobile Ad Hoc network with smart antennas

作　　者：杨军[1] 李建东[1] 李维英[1] 

机构地区：[1]西安电子科技大学信息科学研究所,陕西西安710071

出　　处：《西安电子科技大学学报》2003年第3期309-314,共6页Journal of Xidian University

基　　金：国家自然科学基金资助项目(69872028);国家863计划重大课题(2001AA123031);高等学校优秀青年教师教学科研奖励计划资助

摘　　要：对智能天线在移动AdHoc网络(MANET)中的应用进行了研究.提出了自适应波束形成CSMA/CA(ABF CSMA/CA)协议.该协议利用RTS/CTS短分组对话实现信道预约,在RTS与CTS分组前设置了训练序列,收发节点的智能天线基于训练序列进行波束形成以传输数据分组与ACK.提出改进的"虚拟载波监测"机制进行冲突避免(CA).每个节点中设置两类网络分配矢量(NAV),用一个oNAV记录邻节点以全向模式占用信道的时间,用多个bNAV分别记录各邻节点以波束形成模式传输分组的时间.推导了信道利用率的近似计算公式并进行了仿真.结果表明,ABF CSMA/CA协议与智能天线的结合能够有效实现信道的空分复用(SDMA),显著提高网络的信道利用率.The medium access control (MAC) protocol for supporting the application of smart antennas in the mobile Ad Hoc network (MANET) is studied. An adaptive beamforming CSMA/CA protocol (ABF-CSMA/CA) is proposed. In ABF-CSMA/CA, the RTS/CTS dialogue is used and training sequences are transmitted just before RTS and CTS packets, so the temporal reference beamforming (TRB) can be performed. An improved virtual carrier-sense mechanism is also proposed to enhance collision avoidance (CA) and obtain efficient space division multiple access (SDMA). In this scheme, every node has two kinds of network allocation vector(NAV)- oNAV and bNAV. A theoretical analysis of channel utilization is presented. Results show that the ABF-CSMA/CA protocol can support the application of smart antennas effectively and provide higher channel utilization.

关 键 词：智能天线 移动ADHOC网络 应用 多址接入协议 自适应波束形成CSMA/CA协议 

分 类 号：TN915.9[电子电信—通信与信息系统] TN821.91[电子电信—信息与通信工程]