A Study Of The Adaptive MIMO Technology In The Ka-band Fixed Satellite Communication System

With the rapid development of satellite communication technology, Ka and higherbands become the main trend of the current satellite communication, Ka-band is verysensitive to atmospheric damage. The adaptive technolgy can be resist bad weatherconditions effectively, multiple input multiple output (MIMO,Multiple Input Multiple OutPut) technology can obtain space diversity gain and capacity gains without increasingtransmission power. The combination of adaptive MIMO technology can improve thequality and the transmission efficiency of the Ka-band satellite transmission, and it alsocan resist adverse weather.The thesis studies the channel characteristics of the Ka-band fixed satellitecommunications systems, and then introduce a MIMO system, and several commonmethods of space-time block coding (STBC, Space-time Block Coding) is analysed andcompared. Finally, this papaer focuses on adaptive MIMO scheme.In this paper, an adaptive MIMO modulation algorithm used in Ka-band satellitecommunication channel is studied and simulated. Different from the the general channelattenuation compensation algorithm in Ka-band, the modulation mode can be effectivelychanged the algorithm due to the different weather conditions, in order to maintain a certaintarget bit rate and a higher system throughput. Simulation results show that the algorithmcan effectively deal with Ka band satellite communication in fading channels, balance thesystem performance and spectrum efficiency, and obtain a higher average data throughput.This work intends to find a adaptive MIMO scheme used in the Ka-band satellitesystems. Under different weather conditions, Mainly discuss that how to improve thesystem transmission performance.