An intelligent omni-surface (IOS) assisted holographic multiple-input and multiple-output architecture is conceived for $360^\circ$ full-space coverage at a low energy consumption. The theoretical ergodic rate lower bound of our non-orthogonal multiple access (NOMA) scheme is derived based on the moment matching approximation method, while considering the signal distortion at transceivers imposed by hardware impairments (HWIs). Furthermore, the asymptotically ergodic rate lower bound is derived both for an infinite number of IOS elements and for continuous aperture surfaces. Both the theoretical analysis and the simulation results show that the achievable rate of the NOMA scheme is higher than that of its orthogonal multiple access counterpart. Furthermore, owing to the HWIs at the transceivers, the achievable rate saturates at high signal-to-noise ratio region, instead of reaching its theoretical maximum.

翻译：针对360°全空间覆盖与低能耗需求，本文提出了一种智能全向表面（IOS）辅助的全息多输入多输出架构。基于矩匹配近似方法，推导了所提非正交多址（NOMA）方案的理论遍历速率下界，同时考虑了收发机硬件损伤（HWIs）造成的信号畸变。进一步地，分别推导了无限个IOS单元和连续孔径表面情况下的渐近遍历速率下界。理论分析与仿真结果均表明，NOMA方案的可达速率高于正交多址方案。此外，由于收发机硬件损伤的影响，可达速率在高信噪比区域趋于饱和，无法达到其理论最大值。