有效支持智能天线在无线局域网中应用的新型多址接入协议  

A novel multiple access protocol for a wireless local area network to effectively support a smart antenna

作　　者：李长乐[1] 李建东[1] 李波[1] 张光辉[1] 周雷[1] 贺鹏[1] 

机构地区：[1]西安电子科技大学综合业务网理论与关键技术国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2006年第2期236-240,256,共6页Journal of Xidian University

基　　金：国家自然科学基金和微软亚洲研究院联合资助项目(60372048);国家自然科学基金重大项目(60496316);国家863计划课题(2005AA123910);高等学校博士学科点专项科研基金资助项目(20050701007);高等学校优秀青年教师教学科研奖励计划资助项目;教育部科学技术研究重点项目(104171);国家自然科学基金项目(60572144)

摘　　要：提出了一种在无线局域网中可以有效支持智能天线应用的新型多址接入协议.该协议区别对待AP广播范围内部、外部的用户,形成全向传输期和定向传输期,AP分别对广播范围内的用户通过全向模式采用非竞争的轮询、对广播范围外的用户通过波束形成模式采用基于竞争的方法进行通信.仿真结果表明,新型多址接入协议可有效支持AP全向广播范围外的用户接入网络,扩大无线局域网的有效覆盖范围,并保证全网用户性能比较优越.The use of a smart antenna in extending the coverage range and capacity of a wireless local area network （ WLAN ） dictates the employment of novel multiple access protocols, with which the access point（AP） provides access to remote users. In this paper, a novel and efficient multiple access protocol for the WLAN with a smart antenna has been proposed. Employing the hybrid superframe structure of the contention-free period and contention period, the protocol distinguishes between the users residing in or out of the broadcasting coverage range of the AP. The performance of the protocol is compared with other different three protocols and the effectiveness and robustness of the novel protocol have been proved by simulation. Results show that the protocol can extend the coverage range of the WLAN effectively and support the data exchange between the AP and the stations residing out of its broadcast range.

关 键 词：无线局域网 多址接入协议 智能天线 

分 类 号：TN915.04[电子电信—通信与信息系统]