Research On Power Control Method In Satellite Communication System

The satellite communication system has the advantages of wide range of communication services, the system is not limited by the state of the ground environment, and the satellite communication system has become a hotspot in recent years. The satellite communication system can communicate in harsh environments such as remote areas and earthquake-stricken areas, greatly improving the communication the scope of the spread. However, with the continuous development of Internet technology,satellite communications needs continue to improve, the satellite communications system performance requirements are also rising, but the satellite communication in the space transmission process will be affected by various fading in the channel, thereby reducing the satellite communications system And the power control method has been used to solve the problem of channel fading in satellite communication system.Therefore, the power control method has become a hot research topic both at home and abroad.On the basis of studying the transmission theory and realization method of satellite communication system, this paper focuses on the channel estimation algorithm of satellite communication system and the power control method in satellite communication system. The main work of this paper is as follows:(1) Based on the study of Ka-band satellite communication system channel fading, Ka-band satellite channel model and satellite mobile communication channel model were simulated and verified. And the fading in satellite mobile channel and the satellite channel fading in Ka-band are simulated and analyzed.(2) Based on the analysis of the channel characteristics of Ka-band satellite communication system, a scheme of satellite communication system decision feedback channel estimation based on LS estimation is proposed. A satellite communication system based on LS estimation is proposed to estimate the feedback channel estimation algorithm. The results show that the error performance of satellite communication system based on LS estimation based on LS estimation is better than that of LS -based satellite communication system based on LS estimation. The results show that the error estimation performance of satellite communication system based on LS estimation is better than that of LS - based satellite communication system. Then, an adaptive coding scheme based on decision feedback channel estimation is designed and simulated. The results show that the satellite communication system based on adaptive feedback channel estimation technique adaptive coding algorithm The bit error performance of the satellite communication system is better than that of the adaptive coding algorithm based on the LS channel estimation algorithm.(3) Based on the study of the nonlinear characteristics and the pre-distortion method of the power amplifier, a power control scheme of the satellite communication system based on pre-distortion is designed and simulated. The results show that different power regressions have different effects on the bit error performance of satellite communication systems in power amplifiers, and the power back-off method can improve the nonlinear distortion of power amplifiers and improve the Ka-band satellite communication system Communication quality.