论文标题
可重新配置的智能表面辅助沟通具有离散的相位偏移：实现完全多样性需要多少量化水平？
Reconfigurable Intelligent Surfaces Assisted Communications with Discrete Phase Shifts: How Many Quantization Levels are Required to Achieve Full Diversity?
论文作者
论文摘要
由于硬件限制，需要将可重构智能表面（RISS）的反射元素的相位移动量化为离散值。这封信旨在公布最小所需的相量化级别$ l $，以实现RIS辅助无线通信系统中的全部多样性顺序。借助停电概率的上限，我们首先证明可以实现全部多样性订单，只要$ L $不少于三个。另一方面，如果$ l = 2 $，我们证明可实现的多样性订单不能超过$（n+1）/2 $，其中$ n $是反映元素的数量。这是借助停电概率的下限获得的。因此，我们证明，达到全部多样性订单的最低$ L $的最低要求值为$ L = 3 $。仿真结果验证了理论分析以及相量级水平对RIS辅助通信系统的影响。
Due to hardware limitations, the phase shifts of the reflecting elements of reconfigurable intelligent surfaces (RISs) need to be quantized into discrete values. This letter aims to unveil the minimum required number of phase quantization levels $L$ in order to achieve the full diversity order in RIS-assisted wireless communication systems. With the aid of an upper bound of the outage probability, we first prove that the full diversity order is achievable provided that $L$ is not less than three. If $L=2$, on the other hand, we prove that the achievable diversity order cannot exceed $(N+1)/2$, where $N$ is the number of reflecting elements. This is obtained with the aid of a lower bound of the outage probability. Therefore, we prove that the minimum required value of $L$ to achieve the full diversity order is $L=3$. Simulation results verify the theoretical analysis and the impact of phase quantization levels on RIS-assisted communication systems.
