Research The Maritime Duct Propagation Impact On TD-LTE Communication System

In recent years, the demand for maritime communication is increasing.However, the existing communication methods are unable to meet our low cost and efficiency requirements. At the same time, the land communications system is developing rapidly. The TD-LTE system is showing the advantages on broadband data communication day by day. By using TD-LTE network, we can not only realize the basic function, such as voice communication,data transmission,remote monitor control, but also can provide efficient value-added service. TD-LTE network brings promising opportunity for the construction of maritime communication network. In addition, due to the particularity of the maritime environment,the duct layer will form in the marine atmosphere easily. Through the duct layer, the electromagnetic wave can be transmitted to a far distance even over the horizon. So if we can combine the duct layer with TD-LTE communication system, we will realize the economical and efficient communication on the sea with wide bandwidth to promote the development of maritime communication system. Therefore, according to this view, we did some research on the maritime duct propagation impact on TD-LTE system. The main works and achievements of this paper are as follows:Firstly, the formulation mechanism of duct environment was analyzed comprehensively in this paper. And we introduced the distribution of duct in our country's maritime region. Parabolic equation theory is used in this paper to calculate the path loss. We did research mainly on the surface duct and evaporation duct, which appeared with large probability in marine atmosphere. And we analyzed the frequency, duct height and duct strength influences on duct transmission. The results demonstrate that in the surface duct, 1GHz electromagnetic wave has better propagation effect. While in the evaporation duct, 10GHz electromagnetic wave has the lower path loss.The height and strength of duct layer also influence the transmission. When the duct layer has greater intensity and height, the propagation path loss will be lower.Secondly, we built a TD-LTE simulation platform and combined the duct mechanism with the TD-LTE communication system. By using this simulation platform, we simulated the scenario that using TD-LTE on the sea to research the duct transmission influence on this system. And we focused on the TD-LTE work frequency 1880-2655MHz to do research.Based on the simulation result, we can find that in the surface duct, the performance of this system is good. Signal can be transmitted to more than 400km with a bit error rate less than 0.01. But in the evaporation duct, these electromagnetic waves had non-ideal performance. Even used the 10GHz electromagnetic wave to communicate, it can only reach to 60km when the bit error rate less than 0.01.The main contribution and innovations of this paper are as follows:researched the formulation of the atmospheric duct. The influence factors of the duct transmission were analyzed from many aspects, such as the electromagnetic wave frequency, the strength of duct layer, the height of duct layer, the sending and receiving antenna height. Combined the duct transmission mechanism with TD-LTE system and analyzed the duct environment impact on the TD-LTE system. Finally this paper proved that TD-LTE system can be used in the duct layer on the sea, and provided theoretical and data support for building maritime TD-LTE network.