| Digital microwave safe transmission is a strategic war preparation resource to ensure the safe broadcast of radio and television and the smooth implementation of party and state decrees.The development of digital microwave transmission,namely synchronous digital SDH series,provides a more stable hardware foundation for the microwave transmission of radio and television program signals.In recent years,with the increase of radio and television services in Shanxi Province,Miao qian shan-Fen yang-Huo shan is an important trunk microwave hub station in the province,and the southern line equipment can no longer meet the current demand for radio and television microwave transmission,so it is necessary to transform the Miao qianshan-Fen yang-Huo shan two-hop SDH 3+1 frame microwave equipment.Based on the actual situation of the transformation project of Miao qianshan-Fen yang-Huoshan radio and television microwave circuit in Shanxi Province,this paper introduces and analyzes the specific situation of the whole reconstruction project and the problems that need to be solved from the technical perspective of microwave transmission.In this paper,in the background to the development of radio and television microwave system in our province and the main theory of microwave communication knowledge,on the basis of a brief introduction to the Miao qianshan-Fen yang-Huoshan microwave modification project involves the concrete analysis,microwave technology and the application due to Miao qianshan-Fen yang-Huoshan section of the complex terrain climate changeful and two-hop station 80 km away from biggest to far exceed 50 km caused the decline of this segment in the microwave transmission lines cannot be neglected problem,given the decline problems affect the performance of microwave transmission,in engineering design for two-hop transport independent decline the calculation of reserves,Facing Miao qianshan-Fen yang-Huoshan two-hop of long distance transmission diversity technique is introduced to combat fading problem,by further calculation study two-hop the decline of microwave transmission performance improvement degree of the reserves and diversity,through the actual running for two circuits the calculation of the important performance index of the BER,fully demonstrate diversity in Miao qianshan-Fen yang-Huo shan microwave transforming circuit has an obvious ability to resist fading,is indispensable to the downtown of microwave transmission methods of resistance to decline.Finally,in the final stage of the project,the transceiver level and installation technology are tested,and the test results show that the digital transformation of the microwave circuit completely meets the requirements of the index in terms of transmission quality.This project has successfully completed the overall expansion of the backbone network of microwave trunk lines in our province and laid a solid foundation for the expansion and development of the backbone network of radio and television broadcasting in our province. |
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