Due to large reflection and diffraction losses in the THz band, it is arguable to achieve reliable links in the none-line-of-sight (NLoS) cases. Intelligent reflecting surfaces, although are expected to solve the blockage problem and enhance the system connectivity, suffer from power consumption and operation complexity. In this work, non-intelligent reflecting surface (NIRS), which are simply made of costless metal foils and have no signal configuration capability, are adopted to enhance the signal strength and coverage in the THz band. Channel measurements are conducted in typical indoor scenarios at 300 GHz band to validate the effectiveness of the NIRS. Based on the measurement results, the positive influences of the NIRS are studied, including the improvement of path power and coverage. Numerical results show that by invoking the NIRS, the power of reflected/scattering paths can be increased by more than 10 dB. Moreover, with the NIRS, over half area in the measured scenario has doubled received power and the coverage ratio for a 10 dB signal-to-noise ratio threshold is increased by up to 39%.

翻译：由于太赫兹频段存在较大的反射和衍射损耗，在非视距情况下实现可靠链路颇具挑战性。智能反射表面虽有望解决遮挡问题并增强系统连接性，但其功耗和操作复杂度较高。本文采用由廉价金属箔制成且不具备信号配置能力的非智能反射表面，用以增强太赫兹频段的信号强度与覆盖范围。在300 GHz频段典型室内场景中开展信道测量，以验证NIRS的有效性。基于测量结果，研究了NIRS的积极影响，包括路径功率与覆盖范围的提升。数值结果表明，采用NIRS后，反射/散射路径的功率可提升10 dB以上。此外，在测量场景中，超过一半区域接收功率翻倍，且针对10 dB信噪比门限的覆盖比率最高提升39%。