Distributed Precoding for Satellite-Terrestrial Integrated Networks Without Sharing CSIT: A Rate-Splitting Approach
arxiv(2023)
摘要
Satellite-terrestrial integrated networks (STINs) are promising architecture
for providing global coverage. In STINs, full frequency reuse between a
satellite and a terrestrial base station (BS) is encouraged for aggressive
spectrum reuse, which induces non-negligible amount of interference. To address
the interference management problem in STINs, this paper proposes a novel
distributed precoding method. Key features of our method are: i) a
rate-splitting (RS) strategy is incorporated for efficient interference
management and ii) the precoders are designed in a distributed way without
sharing channel state information between a satellite and a terrestrial BS.
Specifically, to design the precoders in a distributed fashion, we put forth a
spectral efficiency decoupling technique, that disentangles the total spectral
efficiency function into two distinct terms, each of which is dependent solely
on the satellite's precoder and the terrestrial BS's precoder, respectively.
Then, to resolve the non-smoothness raised by the RS strategy, we approximate
the spectral efficiency expression as a smooth function by using the LogSumExp
technique; thereafter we develop a generalized power iteration inspired
optimization algorithm built based on the first-order optimality condition.
Simulation results demonstrate that the proposed method offers considerable
spectral efficiency gains compared to the existing methods.
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