Coordinated satellite-terrestrial networks: A robust spectrum sharing perspective

W. Feng, N. Ge, Jianhua Lu
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引用次数: 22

Abstract

The coordination between satellite communications and terrestrial mobile networks is promising to enable a globally ubiquitous broadband wireless coverage. It also provides an opportunity to share the spectrum between satellites and terrestrial networks, to alleviate the spectrum scarcity problem facing in both systems. Particularly in a coordinated satellite-terrestrial network (CSTN), the co-channel interference (CCI) should be carefully mitigated. Towards this end, this paper proposes a large-scale channel state information (CSI)-based robust coordination scheme. As the information exchange between satellite and terrestrial system is practically limited, and the overhead of each system for CSI acquisition is also limited, the proposed scheme is much more viable than existing results. In practice, the slowly-varying large-scale CSI can be obtained with a quite low cost, and the saddle point theory can be adopted to largely reduce the computational complexity of the proposed scheme. We finally show the simulation results to validate the superiority of the proposed scheme over existing methods.
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协调卫星-地面网络:一个稳健的频谱共享观点
卫星通信和地面移动网络之间的协调有望实现全球无处不在的宽带无线覆盖。它还提供了在卫星和地面网络之间共享频谱的机会,以缓解这两个系统面临的频谱短缺问题。特别是在协调卫星-地面网络(CSTN)中,同信道干扰(CCI)应该小心地减少。为此,本文提出了一种基于大规模信道状态信息(CSI)的鲁棒协调方案。由于卫星与地面系统之间的信息交换实际上是有限的,并且每个系统对CSI采集的开销也是有限的,因此所提出的方案比现有的结果更具可行性。在实际应用中,可以以较低的成本获得慢变化的大尺度CSI,并且可以采用鞍点理论大大降低所提方案的计算复杂度。最后给出了仿真结果,验证了该方案相对于现有方法的优越性。
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