基于无线局域网支持智能天线的优化MAC协议  

Optimized MAC protocol supporting smart antennas over WLAN

作　　者：赵力强[1] 张忠浩 赵小冬[3] 张海林[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071 [2]西北电网有限公司,陕西西安710048 [3]航空计算技术研究所,陕西西安710071

出　　处：《系统工程与电子技术》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

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.

关 键 词：无线局域网 媒体接入控制协议 智能自适应阵列天线 空分复用 

分 类 号：TN915.9[电子电信—通信与信息系统]