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arXiv 2104.06758cs.NI
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基于多任务学习的可重构智能表面辅助空地通信

Reconfigurable Intelligent Surface-Assisted Aerial-Terrestrial Communications via Multi-Task Learning

Xuelin Cao, Bo Yang, Chongwen Huang, Chau Yuen, Marco Di Renzo, Dusit Niyato, Zhu Han

摘要:

空中-地面通信系统构成了支持和补充地面通信的有效范例。然而,这样的系统的好处不能被充分利用,特别是当视线(LoS)传输容易严重恶化,由于在城市地区的复杂传播环境。新兴的可重构智能表面(RISs)技术最近已成为一种潜在的解决方案,以减轻传播引起的损伤和提高无线网络覆盖。出于这些考虑,在本文中,我们提出了一个RIS辅助传输策略的空-地通信系统的覆盖范围和链路性能的问题。特别是,我们设计了一个自适应的RIS辅助传输协议,其中的信道估计,传输策略和数据传输独立地实现在一个帧。在此基础上,我们制定了一个RIS辅助传输策略优化问题作为一个混合整数非线性规划(MINLP),以最大限度地提高系统的整体吞吐量。然后,我们采用多任务学习来加速问题的解决。得益于多任务学习,计算时间减少了约四个数量级。仿真结果表明,所提出的RIS辅助传输协议显着提高了系统的吞吐量,降低了发射功率。

英文摘要:

The aerial-terrestrial communication system constitutes an efficient paradigm for supporting and complementing terrestrial communications. However, the benefits of such a system cannot be fully exploited, especially when the line-of-sight (LoS) transmissions are prone to severe deterioration due to complex propagation environments in urban areas. The emerging technology of reconfigurable intelligent surfaces (RISs) has recently become a potential solution to mitigate propagation-induced impairments and improve wireless network coverage. Motivated by these considerations, in this paper, we address the coverage and link performance problems of the aerial-terrestrial communication system by proposing an RIS-assisted transmission strategy. In particular, we design an adaptive RIS-assisted transmission protocol, in which the channel estimation, transmission strategy, and data transmission are independently implemented in a frame. On this basis, we formulate an RIS-assisted transmission strategy optimization problem as a mixed-integer non-linear program (MINLP) to maximize the overall system throughput. We then employ multi-task learning to speed up the solution to the problem. Benefiting from multi-task learning, the computation time is reduced by about four orders of magnitude. Numerical results show that the proposed RIS-assisted transmission protocol significantly improves the system throughput and reduces the transmit power.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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