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对基于紫外光非视距(NLOS)定向发送全面接收通信方式(MAC)协议进行了研究。首先根据紫外光NLOS通信的特点,推导出NLOS通信覆盖范围方位角的表达式;其次根据紫外NLOS通信时路径损耗特点和方位角表达式,对目前紫外NLOS定向发送全向接收的节点结构设计规则进行改进;然后提出一种基于角度感知的紫外光NLOS通信定向MAC协议;最后利用网络模拟软件(NS2)进行仿真。结果表明,新协议通过角度感知中接口仰角邻居表的使用,极大地提高了网络吞吐量,且可降低平均端到端时延。
Research was conducted on the transmission of a fully received communication protocol (MAC) based on the NLOS (non-line-of-sight) non-line-of-sight (NLOS) First of all, according to the characteristics of NLOS communication, the expression of NLOS communication azimuth is deduced. Secondly, according to the characteristics of path loss and azimuth expression in NLOS communication, the design rules of node structure for the current NLOS directional omni-directional reception Then propose an orientation-based UV NLOS communication directed MAC protocol; and finally use the network simulation software (NS2) to simulate. The results show that the new protocol can greatly improve network throughput and reduce the average end-to-end delay through the use of angle-aware neighbor table in angle perception.