Neighborhood Node Estimation And Network Optimization In Scattered Communication Networks

The non-line-of-sight(NLOS)scattering communication does not require strict align-ment of the transceiver,and the ultraviolet light band has good scattering performance,so that the scattering communication can be applied to communication under long-distance or obstructed scenes.The effective communication rate of single-link scat-ter communication has a great correlation with the relative angle of the antenna at the transceiver.If the receiving node has directional sensing capability,the quality of the communication link can be effectively improved.For a communication network com-posed of multiple nodes,effective interference suppression can greatly improve the net-work performance.Therefore,it is of great significance to estimate the direction of neighbor nodes and optimize the network in ultraviolet scattering communication.This paper mainly researches the direction estimation of neighbor nodes in ultraviolet scatter-ing,and proposes a fast calculation method for link loss,which is applied to the network for network topology analysis and performance optimization.The main contributions of this paper are as follows:·Considering the direction estimation of neighbor nodes at the receiving end,and designing an array antenna structure.Propose a direction estimation scheme based on this structure,analyze the estimation accuracy and the robustness of the direction estimation under different transmission parameters(transmitter el-evation angle and communication distance).Finally,the simulation results are verified by building an experimental platform,and the effective estimation error is within 2°.·Considering the high computational complexity of using Monte Carlo method for path loss simulation,a fast calculation method of path loss is proposed,which is mainly to model the spatial region where scattering may occur,and express the size of the path loss with an analytical method.The path loss distribution under different parameters of the transmitter is simulated and compared,and it is found that the two-dimensional distribution contour of the path loss can be fitted with an ellipse.·The design of the antenna structure of the transceiver can directly affect the com-munication performance of a single link in the network.An array antenna struc-ture applied to the transmitter is proposed.In ad-hoc network,it compares differ-ent results with traditional antennas.Using network connectivity probability and minimum connectivity power as indicators,the results under different parameters are simulated,and give the optimal array antenna design parameters.The number of antennas is 3?7,the elevation angle is 20°?40°.·For the typical application scenario of scattering communication,a layered net-work structure is proposed.The first-layer nodes use array antennas,and the second-layer nodes use omnidirectional antennas.The nodes in the network all obey the uniform Poisson distribution.In this network,the first-level nodes will interfere with each other when communicating.In order to ensure the perfor-mance of each node in the network,consider optimizing the worst node,and con-struct an optimization problem,propose a power control algorithm to effectively reduce the interference of nodes in the network.Perform power control to effec-tively increase the node capacity of the worst node by 10%?20%.After adding the CSMA/CA protocol of the MAC layer,it is found that the effective rate of the worst node has also been improved.