利用智能天线实现多点中继功能的Ad Hoc网络MAC协议

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。

MAC Protocol based on Smart Antenna in Realization of Multi-relay

In the Ad Hoc networks, the multi-hop transmission is used to improve the quality and the rate of the data transfer. The traditional single relay node could not adapt the rapid-increase amount of data nodes, as well as the movement of the channel caused by the decline of the channel situation. Therefore, the MAC protocol based on smart antennas is proposed to realize multi diamond handshake and pipelined data transmission. When the channel state between the relay node and receiver is not good, a space time block coding cooperative relay scheme is used to estimate the signal of the sender Finally, Busy Tones are used to prevent the problems of the hidden and exposed terminals. Simulation and comparison indicate that the MRDMAC protocol has certain superiority in throughput and the delay of the data.