基于SCMA的卫星通信系统性能研究

Research on the performance of satellite communication system based on SCMA

随着国家天地一体化信息网络项目的快速推进,卫星通信系统是构建该项目不可或缺的组成部分。由于卫星通信系统覆盖范围广,未来将会面临着海量用户接入、频谱资源紧张的问题。传统的卫星通信大多采用正交传输的方式,频谱利用率低。因此文章将地面5G应用比较广泛的稀疏码多址接入[1-2]技术(sparse code multiple access,SCMA)引入卫星通信系统中,对卫星信道进行建模,对其关键技术和传输性能进行分析。为解决未来空口传输体制的问题和我国的天地一体化信息网络的构建提供借鉴。

With the advancement of the National Space-Earth Integration Information Network Project,the satellite communication system is an important part of the construction of this project.Due to its wide communication coverage,it will face the problems of massive user access and shortage of spectrum resources in the future.Traditional satellite communications mostly use orthogonal transmission,which has low spectrum utilization.Therefore,this paper introduces the sparse code multiple access[1-2]technology(SCMA),which is widely used in terrestrial 5G,into the satellite communication system,models the satellite channel,and analyzes its key technologies and transmission performance.It provides reference for solving the problem of future air interface transmission system and the construction of the integrated information network of space and earth in my country.