The Terahertz (THz) band (0.1-10 THz) has been envisioned as one of the promising spectrum bands for sixth-generation (6G) and beyond communications. In this paper, a dual-band angular-resolvable wideband channel measurement in an indoor L-shaped hallway is presented and THz channel characteristics at 306-321 GHz and 356-371 GHz are analyzed. It is found that conventional close-in and alpha-beta path loss models cannot take good care of large-scale fading in the non-line-of-sight (NLoS) case, for which a modified alpha-beta path loss model for the NLoS case is proposed and verified in the NLoS case for both indoor and outdoor L-shaped scenarios. To describe both large-scale and small-scale fading, a ray-tracing (RT)-statistical hybrid channel model is proposed in the THz hallway scenario. Specifically in the hybrid model, the deterministic part in hybrid channel modeling uses RT modeling of dominant multi-path components (MPCs), i.e., LoS and multi-bounce reflected paths in the near-NLoS region, while dominant MPCs at far-NLoS positions can be deduced based on the developed statistical evolving model. The evolving model describes the continuous change of arrival angle, power and delay of dominant MPCs in the NLoS region. On the other hand, non-dominant MPCs are generated statistically. The proposed hybrid approach reduces the computational cost and solves the inaccuracy or even missing of dominant MPCs through RT at far-NLoS positions.

翻译：摘要：太赫兹频段（0.1-10 THz）已被视为第六代（6G）及未来通信的潜在候选频段之一。本文介绍了在室内L形走廊中进行的双频段角分辨率宽带信道测量，并分析了306-321 GHz和356-371 GHz频段的太赫兹信道特性。研究发现，传统的近端和α-β路径损耗模型无法很好地处理非视距（NLoS）情况下的大规模衰落，为此针对NLoS场景提出了一种改进的α-β路径损耗模型，并在室内外L形场景的NLoS条件下进行了验证。为同时描述大规模和小规模衰落，本文在太赫兹走廊场景中提出了一种射线追踪（RT）-统计混合信道模型。在该混合模型中，确定性部分采用RT对主导多径分量（MPC）进行建模，即近NLoS区域的视距（LoS）路径与多跳反射路径，而远NLoS位置的主导MPC可基于所开发的统计演化模型推导得出。该演化模型描述了NLoS区域中主导MPC的到达角、功率和时延的连续变化。另一方面，非主导MPC则通过统计方法生成。所提出的混合方法降低了计算成本，并解决了远NLoS位置通过RT获取主导MPC时的不准确甚至缺失问题。