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在Ad Hoc网络中,采用多跳传输来提高数据传输的质量以及速率。传统的单中继节点已经不能适应迅速增大的数据量以及节点的移动造成的信道衰落情况,所以本文提出了基于智能天线实现多点中继的MAC协议,该协议采用了智能天线实现了菱形握手机制,使数据实现同步传输。其次采用空时编码的协作机制,通过估计源信号来防止中继节点与目的节点信道衰落的情况。最后利用Busy Tones解决了隐藏终端和暴露终端的问题。通过仿真与比较证明MRDMAC协议在数据延时和通过率等各个方面都有很大的优越性。
In Ad Hoc networks, multi-hop transmission is used to improve the quality and rate of data transmission. The traditional single relay node can not adapt to the rapidly increasing data volume and the channel fading caused by node movement. Therefore, this paper proposes a MAC protocol based on smart antenna to achieve multi-point relay, which uses a smart antenna to achieve a diamond Handshake mechanism, the data to achieve synchronous transmission. Secondly, the cooperative mechanism of space-time coding is adopted to prevent the channel fading of the relay node and the destination node by estimating the source signal. Finally, using Busy Tones to solve the problem of hidden terminals and exposed terminals. Through simulation and comparison, MRDMAC protocol has great superiority in all aspects such as data delay and pass rate.