摘要
在充分考虑IEEE802 11无线局域网特点的基础上,提出支持智能自适应阵列天线的媒体接入控制协议:SADCF.智能天线包括全向和定向两种工作模式.在发送数据帧前尽可能短的时间内,SADCF利用全向RTS/CTS握手机制预约信道,引导发送或接收站点发送训练序列.智能天线接收训练序列后计算出与该站点对应的权矢量,形成定向波束,定向收发数据帧.相邻站点用全向网络分配矢量记录发送站点以全向模式占用信道的时间,在发送站点定向通信的时候复用信道.SADCF与IEEE802 11协议完全兼容.仿真结果表明,SADCF协议能够有效支持智能天线的应用,实现信道的空分复用,显著提高网络吞吐量;理论分析结果与仿真结果基本吻合.
Based on the characteristics of IEEE 802.11 WLAN, a medium access control protocol SADCF is proposed to support smart adaptive array antennas. A smart antenna has omnidirectional and directional operation modes. In SADCF, before sending any data frame, the station stimulates the corresponding station to transmit a training sequence by means of omnidirectional RTS/CTS handshake mechanism. Based on the training sequence, the directional beam can be formed by the smart antenna. Then the station can transmit and receive data frames in directional mode. Other stations save the transmission time of the sender in omnidirectional mode by using the omnidirectional network allocation vector, and multiplex channel when it transmits in directional mode. SADCF is compatible with IEEE 802.11. Simulation results show that the SADCF protocol can support smart antennas effectively and provide high throughput by multiplexing the channel, and results of the analysis are close to the simulation results.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2004年第4期602-607,共6页
Journal of Xidian University
基金
国家自然科学基金资助项目(69896245)
高等学校博士学科点专项科研基金资助项目
