In this paper, we utilize tools from stochastic geometry to estimate the interference propagation via reconfigurable intelligent surface (RIS) in the millimeter wave (mmWave, 30-300 GHz) band and specifically on the D band (110-170 GHz). The RISs have been of great interest lately to maximize the channel gains in non-line-of-sight (NLOS) communication situations. We derive expressions for stochastic interference level in RIS powered systems and validate those with simulations. It will be shown that the interference levels via RIS link are rather small compared to the designed RIS link or the LOS interference as the random interference loses significant part of the RIS gain. We also analyse the validity of far field channel and antenna gains in the near field of a large array. It is shown that, while the high frequency systems require large arrays that push the far field far away from the antenna, the far field equations are very accurate up to about half way of the near field.
翻译:在本文中,我们利用从随机几何学中得出的工具来估计通过可重新配置的智能表面(RIS)在毫米波(mWave, 30-300GHz)波段,特别是在D波段(110-170GHz)上的干扰传播。最近,RIS对在非观测线通信状态下最大限度地增加频道的收益非常感兴趣。我们从有动力的系统中得出随机干涉水平的表达方式,并用模拟来验证。将显示,与设计的RIS链路或LS干扰相比,通过RIS链路的干扰程度相当小,因为随机干扰会损失RIS获得的很大一部分。我们还分析了远场通道和天线在近场大阵列中增益的有效性。我们发现,虽然高频系统需要大型阵列,将远距离天线推离天线很远,但远的场方程方程方程式非常精确,接近近场的一半。