Research On Neighbor Discovery Technology For Directional Antenna Enabled Wireless Ad Hoc Networks

The Wireless Ad Hoc Network(Mobile Ad Hoc Network,MANET),also known as the wireless self-organizing network,consists of several peer-to-peer nodes that can communicate with each other,it does not need to build a network through a fixed infrastructure,and organizes and manages the network between the nodes that make up the network,and has a fast network.Strong anti-destruction ability,flexible structure and other advantages.Compared with omnidirectional antenna,directional antenna has the characteristics of wide coverage,strong anti-jamming ability and not easy to be intercepted,and has advantages in military countermeasures communication,and the wireless self-organizing network using directional antenna is widely used in the military field.Because wireless self-organizing network nodes are mobile,it is necessary to have efficient and reliable neighbor discovery algorithms to ensure that nodes can maintain their topological tables in real time and ensure stable communication.Compared with omnidirectional antennas,networks using directional antennas face more difficulties in the process of neighbor discovery,and the directionality of the signal greatly reduces the probability of mutual discovery between the two nodes.Because it is difficult to predict the location of neighbor nodes and the state of sending and receiving in advance,better coordination between nodes is needed for fast and efficient neighbor discovery.Most of the existing neighbor discovery algorithms are aimed at beam switching antennas,while adaptive beam antennas have high communication quality,can listen in all directions,and have greater advantages in the neighbor discovery process.In order to solve the problem of asynchronous system problems,signal conflicts,and the efficiency of neighbor discovery through collaboration between nodes,this paper focuses on two main things:First,the binary coding-based transceiver sequence is applied to the adaptive beam antenna neighbor discovery algorithm,the feasibility and performance are discussed and compared with other algorithms,and the simulation verification is carried out by MATLAB,so that the neighbor discovery can be done in asynchronous system by changing the method of regularity,so that the neighbor discovery can be done in asynchronous system.This paper discusses the effect of asynchronous system on its performance,proposes a conflict avoidance method based on random rotation,improves the algorithm of the above-mentioned neighbors,enhances its conflict avoidance ability,and compares with the common conflict avoidance method.Second,a collaborative neighbor discovery mechanism is proposed,so that nodes can calculate their potential neighbors through the information of their neighbor nodes that have been discovered,get the distance and location of potential neighbors,and change the sending and receiving strategy on their potential neighbor's location to increase the probability of neighbor discovery.The collaboration-based neighbor discovery mechanism is added to the synchronous system neighbor discovery algorithm and the asynchronous system neighbor discovery algorithm respectively,the difference of the algorithm is analyzed and the difference of the algorithm is analyzed by the cooperative and non-collaborative neighbors,and the advantages of the neighbor discovery mechanism are verified by using MATLAB to simulate the two cases.