The much higher frequencies in the Terahertz (THz) band prevent the effective utilization of channel models dedicated for microwave or millimeter-wave frequency bands. In this paper, a measurement campaign is conducted in an indoor corridor scenario at 306-321 GHz with a frequency-domain Vector Network Analyzer (VNA)-based sounder. To realize high-resolution multipath component (MPC) extraction for the direction-scan measurement campaigns in the THz band, a novel modified space-alternating generalized expectation-maximization (SAGE) algorithm is further proposed. Moreover, critical channel characteristics, including the path loss, shadow fading, K-factor, delay spread, angular spreads, cluster parameters, and cross correlations are calculated and analyzed in the LoS case. Besides, two contrasted measurement campaigns in the NLoS case are conducted, with and without additional reflective foils on walls to serve as effective scatterers. Comparison results indicate that the reflective foils are useful to improve the channel conditions in the NLoS case by nearly 6 dB, which is potential to be utilized as alternative of intelligent reflecting surfaces (IRS) to enhance the coverage ability of THz communications.

翻译：太赫兹频段极高的频率使得适用于微波或毫米波频段的信道模型无法有效使用。本文利用基于频域矢量网络分析仪（VNA）的探测系统，在306-321 GHz频段对室内走廊场景进行了测量实验。为实现太赫兹频段方向扫描测量实验中高分辨率多径分量（MPC）的提取，进一步提出了一种新颖的改进空间交替广义期望最大化（SAGE）算法。此外，在视距（LoS）条件下计算并分析了关键信道特性，包括路径损耗、阴影衰落、K因子、时延扩展、角度扩展、簇参数及互相关性。同时，在非视距（NLoS）条件下进行了两组对比测量实验，分别对应墙壁上是否贴附额外反射箔作为有效散射体。对比结果表明，反射箔可使NLoS条件下的信道条件改善近6 dB，具备作为智能反射面（IRS）替代方案的潜力，以增强太赫兹通信的覆盖能力。