A Novel Multiple Access Protocol for Mobile Ad Hoc Network with Smart Antennas

• 作者: LIJiandong YANGJun ZHOUXiaodong
• 来源期刊: 电子学报(英文版)
• 学科: 工学
• 关键词: 移动AdHoc网络 智能天线 多路存取协议 TRB CTS
• 年，卷（期）: 2004,（2）
• 页码范围: 361-365
• 页数: 5页
• 分类号: TN929.5|TN821.91
• 语种: 中文

摘要

The approach to employ smart antennas in Mobile ad hoc network (MANET) nodes is presented. An adaptive beamforming-Carrier-Sense multiple access/collison avoidance) (ABF-CSMA/CA) protocol is proposed. In the ABF-CSMA/CA, Request-to-Send/Clear-to-Send (RTS/CTS) dialogue is used to distribute channel reservation information. Training sequences are transmitted just before RTS and CTS packets, so the Temporal reference beamforming (TRB) can be performed by the source node and the destination node.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): an oNAV maintains the interval of ongoing transmission of neighbors whose smart antennas operate in omnidirectional mode, and multiple bNAVs maintain those intervals of neighbors whose smart antennas operate in beamforming mode. Theoretical analysis of channel utilization of the proposed protocol is presented. Results show that ABF-CSMA/CA protocol combining with smart antennas can provide higher channel utilization.