We analyze the influence of a reconfigurable intelligent surface (RIS) on the Gram channel eigenvalues in a high signal-to-noise ratio (SNR) scenario. This allows to connect specific channel properties with the rank improvement capabilities of the RIS. In particular, fundamental limits due to a possible line of sight (LOS) setup between the base station (BS) and the RIS are derived. Furthermore, dirty paper coding (DPC) based schemes are compared to linear precoding in such a scenario and it is shown that under certain channel conditions, the performance gap between DPC and linear precoding vanishes.
翻译：我们在高信噪比（SNR）场景下分析了可重构智能表面（RIS）对Gram信道特征值的影响。这允许将特定的信道属性与RIS的秩提高能力联系起来。特别是，由于基站（BS）和RIS之间可能存在直视（LOS）设置，因此导出了基本极限。此外，比较了基于脏纸编码（DPC）的方案和线性预编码在这种情况下的性能，发现在某些信道条件下，DPC和线性预编码之间的性能差距消失。
相关内容
微信扫码咨询专知VIP会员