论文标题
为了更大的利益牺牲CSI：支持RIS的机会率分裂
Sacrificing CSI for a Greater Good: RIS-enabled Opportunistic Rate Splitting
论文作者
论文摘要
在可重新配置的智能表面（RIS）辅助系统中，相移的优化需要对直接和RIS辅助渠道单独获取通道状态信息（CSI），从而带来了重大的设计挑战。在本文中，提出了一种新颖的方案，该方案考虑了试点开销等实践局限性（CE）错误以提高净绩效。更具体地说，以不可预测的干扰为代价，为了减少CE时间，牺牲了RIS辅助通道的CSI的一部分。通过在相干块和采用速率拆分之间交替交替，可以减轻干扰，从而补偿被牺牲的CSI的不利影响。数值模拟验证了所提出的方案在可实现的净率方面表现出更好的性能，从而在考虑CE时间和CE错误时，可获得高达160％的非正交多重访问（NOMA）。
In reconfigurable intelligent surface (RIS)-assisted systems, the optimization of the phase shifts requires separate acquisition of the channel state information (CSI) for the direct and RIS-assisted channels, posing significant design challenges. In this paper, a novel scheme is proposed, which considers practical limitations like pilot overhead and channel estimation (CE) errors to increase the net performance. More specifically, at the cost of unpredictable interference, a portion of the CSI for the RIS-assisted channels is sacrificed in order to reduce the CE time. By alternating the CSI between coherence blocks and employing rate splitting, it becomes possible to mitigate the interference, thereby compensating the adverse effect of the sacrificed CSI. Numerical simulations validate that the proposed scheme exhibits better performance in terms of achievable net rate, resulting in gains of up to 160% compared non-orthogonal multiple access (NOMA), when CE time and CE errors are considered.
