Computer Science ›› 2019, Vol. 46 ›› Issue (11): 72-79.doi: 10.11896/jsjkx.181001862

• Network & Communication • Previous Articles     Next Articles

Adaptive Information Transmission Scheme for LEO Satellite Based on Ka Band

YU Xiu-lan, WANG Si-yi   

  1. (School of Communication and Information Engineering,Chongqing University of Posts andTelecommunications,Chongqing 400065,China)
  • Received:2018-10-08 Online:2019-11-15 Published:2019-11-14

Abstract: Aiming at solving the problem that Ka-band satellite communication signal transmission is easily affected by rainfall and ground environment,this paper studied the distribution of the Ka-band based rain attenuation of LEO satellite channel by considering the high-speed movement characteristics of LEO satellite and the propagation characteristics of satellite-to-earth link,and proposed an adaptive information transmission scheme for LEO satellite to improve the reliability of system information transmission.Firstly,a Ka frequency band LEO satellite mobile communication channel model is established to solve the problem that the transmission signal is easily affected by rainfall and the variation of elevation angle.Secondly,the probability density function of the rain attenuation based on the change of the elevation angle is calculated by combining the elevation varying range and the elevation probability density function of LEO satellite.Thirdly,according to the probability density function of the rain attenuation and the current channel state,the channel parameters are calculated and the channel state information can be obtained.Then,according to the confirmed channel state information,the signal-to-noise ratio thresholds of different channel states and different modulation coding modes can be calculated with the error rate of 1×10-4.Finally,by comparison of the feedback signal-to-noise ratio and the calculated signal-to-noise ratio thresholds,the best modulation and coding mode is selected through the adaptive modulation coding selection algorithm,which can promote the transmission reliability of spatial information.The simulation results show that the lower the elevation angle of satellite is,the more serious the ground shadowing is,and the bit error ratio of system is higher under the different channel states.The proposed adaptive information transmission scheme makes the bit error ratio of the satellite communication systems always lower than the target bit error ratio of 1×10-4.The results show that the proposed adaptive information transmission scheme can effectively solve the problem of serious attenuation of transmission signal caused by rainfall,ground mobile environment and satellite mobility,and effectively enhance the information transmission quality of LEO satellite system based on Ka band.

Key words: Adaptive modulation and coding, Ka band, LEO satellite, Rain attenuation distribution, Satellite elevation angle

CLC Number: 

  • TN929.5
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