| Compared to the land mobile communication system,satellite mobile communication system has wide band,wide coverage area,flexible networking and other advantages.However,the traditional satellite fading channel has seriously hindered the rapid development of the space information network.Therefore,the cooperative diversity technology is introduced into the satellite mobile communication system to combat channel fading.In this paper,the satellite mobile communication system and the cooperative diversity technology are analyzed,and the relay node selection strategy is the main research direction.A detailed analysis and study of satellite mobile communication system is carried out in this paper.The satellite channel is composed of two kinds of states "good state" and "bad state".And then we describes the scene model of the satellite communication cooperative diversity system,which provides the original system model for this research.Finally,the forwarding mechanism of the relay node and the destination node of the algorithm are discussed and analyzed.In this paper,a relay node selection strategy based on satellite specific channel is studied.When the satellite channel is in good condition,the satellite channel is only affected by the slight shadow fading,the signal to noise ratio of the received signal is very high,and the communication is almost not interrupted.When the satellite channel is in bad condition,the signal is affected by severe shadow fading,and the communication is likely to be interrupted,at this time,the cooperative transmission mode is adopted.And,in the transmission process,there is a time delay,therefore,the actual signal to noise ratio and the signal to noise ratio of the current time are different.A relay node selection strategy based on outdated channel state information is proposed,and the feasibility of the proposed method is verified by theoretical analysis and Simulation of the outage probability,channel capacity and error probability. |
PDF Full Text Request