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电子学报  2015 

MIMO链路AdHoc网络中线程化的拓扑未知多址接入协议

DOI: 10.3969/j.issn.0372-2112.2015.06.031, PP. 1241-1248

Keywords: 自组织网络,媒体接入控制,协议线程化,时间扩展多址接入,多输入多输出

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Abstract:

针对MIMO链路AdHoc网络,提出了支持MIMO的线程化拓扑未知多址接入协议(MIMO-T-TTMA).MIMO-T-TTMA将时间扩展多址接入(TSMA)协议和时分多址接入(TDMA)协议以时间交替的方式相结合,进而为网络中节点分配时隙.在MIMO-T-TTMA中,每个节点被分配了若干时隙,每个分配时隙中,节点通过交互请求发送/允许发送(RTS/CTS)分组来确定发送使用的数据流数,而当RTS/CTS交互失败或者当前时隙为未分配时隙时,节点仍依一定的概率发送一个数据流,以提高网络的吞吐量.为了评估协议的性能,推导了MIMO-T-TTMA的吞吐量.数值结果表明,与已有的协议相比,MIMO-T-TTMA在节点度较大时具有较高的吞吐量,并且,吞吐量随节点度的变化比较平稳,因此,MIMO-T-TTMA适用于拓扑常发生剧烈变化的AdHoc网络.

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