CAJ | 학술논문

定向天线利用数字信号处理技术产生空间定向波束，将发射信号能量集中在某一个或者某些特定的方向上进行辐射，其应用于传统的Ad hoc网络中能够有效减少相邻节点间的互干扰，并能通过增加同时传输的节点对数达到显著提升网络空间复用率和容量的目的。首先简单介绍了定向天线和定向通信特点，然后对定向Ad hoc网络MAC层组网关键技术进行了综述，并对定向邻居发现协议、空分TDMA动态时隙分配机制、定向波束对准与跟踪技术等进行介绍和梳理，最后总结现有研究不足并指出未来重点研究方向。
정향천선이용수자신호처리기술산생공간정향파속，장발사신호능량집중재모일개혹자모사특정적방향상진행복사，기응용우전통적Ad hoc망락중능구유효감소상린절점간적호간우，병능통과증가동시전수적절점대수체도현저제승망락공간복용솔화용량적목적。수선간단개소료정향천선화정향통신특점，연후대정향Ad hoc망락MAC층조망관건기술진행료종술，병대정향린거발현협의、공분TDMA동태시극분배궤제、정향파속대준여근종기술등진행개소화소리，최후총결현유연구불족병지출미래중점연구방향。
Directional antenna produces spatial directional beams with digital signal processing technology, and radiates the signal energy in a certain or some special directions. When applied in traditional ad hoc network,directional antennas can dramatically reduce the interference between neighboring nodes and by increasing the node pairs for simultaneous transmissions,enhance the spatial reuse rate and capacity of the network. Firstly,the basic characteristics of directional antennas and directional communications are briefly introduced in this paper. Then the key networking technologies of directional ad hoc network in MAC layer, such as the protocol of neighbor discovery, TDMA and directional beam pointing and tracking,are summa-rized. Finally,problems in research and development are discussed in detail.