Adaptive modulation and coding method specific to remote sensing data transmission of low earth orbit satellite

Abstract

The invention discloses an adaptive modulation and coding method specific to remote sensing data transmission of a low earth orbit satellite. On one hand, through estimation and smoothing of an SINR (Signal to Interference plus Noise Ratio), the problems of frequency selective fading and channel time varying in a remote sensing data transmission channel of the low earth orbit satellite are solved, and stable measurement of a channel state is realized; and the SINR is predicted by means of the predictability of the channel, so that the problem of expiration of an SINR estimated value due to large time delay in satellite-ground transmission is relieved. On the other hand, data transmission equipment of a remote sensing satellite has receiving and transmitting functions, so that an SINR measurement station does not need to be built, and SINR measurement can be finished directly by a ground receiving end through the prior art, thereby simplifying a system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to an adaptive modulation and encoding method for low-orbit satellite remote sensing data transmission. Background technique [0002] Adaptive modulation and coding makes the modulation and coding efficiency increase with the improvement of channel conditions. It has been maturely applied in satellite communication and ground mobile communication, and can be used for reference in the transmission of low-orbit satellite remote sensing data, so that the transmission rate increases with the elevation angle. And the corresponding increase, so as to make full use of the link power margin in the high elevation angle area in the low-orbit remote sensing satellite transit window. [0003] At present, the adaptive modulation and coding method for remote sensing satellite data transmission (Zhang Jiapeng, Huang Puming, Chen Hong. Analysis and Simulation of Remote Sensing Satellite Adapti...

AI Technical Summary

Problems solved by technology

However, for the small mobile receiving end of the low-orbit remote sensing satellite, due to the wide antenna beam, it will introduce multipath interference and channel time-varying characteristics

Therefore, the existing remote sensing satellite data transmission ACM method is only suitable for ground fixed stations equipped with large-diameter antennas, and is not suitable for small mobile terminals.

[0008] In addition, since the data transmission payload of the low-orbit remote sensing satellite currently used only has the launch function, it is necessary to add a special SINR measurement station to realize the change of the modulation and coding method of the low-orbit remote sensing satellite through the remote control channel

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