摘要
提出优化的媒体接入控制协议OD-DCF,可以在一个无线局域网内同时支持智能自适应阵列天线和全向天线。在发送数据帧前,OD-DCF利用全向RTS/CTS握手机制预约信道,引导发送站点和接收站点发送训练序列。智能天线根据训练序列计算出对应的权矢量,定向收发数据帧。为了解决智能天线与全向天线的兼容问题,OD-DCF支持基于天线种类的分级机制:通过调节竞争参数,智能天线可优先接入网络;在形成定向波束后,相邻站点复用信道。仿真结果表明,OD-DCF协议能够有效支持信道的空分复用,显著提高网络吞吐量,降低时延和时延抖动。
An optimized medium access control protocol, OD-DCF is proposed to support both smart adaptive array antennas and normal omnidirectional antennas simultaneously in one WLAN. In OD-DCF, before sending any data-frames, the sender and receiver station transmits a training sequence respectively by means of the omnidirectional RTS/CTS handshake mechanism. Based on the training sequence, the directional beam can be formed by smart antennas. Then the stations can transmit and receive data-frames in the directional mode. OD-DCF supports service differentiation based on antennas by tuning contention parameters, and smart antennas have a higher priority than omnidirectional antennas. Other stations multiplex the channel after smart antennas work in the directional mode. Simulation results show that OD-DCF can increase throughput by multiplexing channel, and decrease delay and jitter, and that the analysis results are close to the Simulation results.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2008年第1期181-185,共5页
Systems Engineering and Electronics
基金
国家自然科学基金(60772137)
陕西省自然科学基础研究计划项目(2006F30)资助课题
