The Terahertz (0.1-10 THz) band has been envisioned as one of the promising spectrum bands to support ultra-broadband sixth-generation (6G) and beyond communications. In this paper, a wideband channel measurement campaign in a 500- square-meter indoor lobby at 306-321 GHz is presented. The measurement system consists of a vector network analyzer (VNA)-based channel sounder, and a directional antenna equipped at the receiver to resolve multi-path components (MPCs) in the angular domain. In particular, 21 positions and 3780 channel impulse responses (CIRs) are measured in the lobby, including the line-of-sight (LoS), non-line-of-sight (NLoS) and obstructed-line-of-sight (OLoS) cases. The multi-path characteristics are summarized as follows. First, the main scatterers in the lobby include the glass, the pillar, and the LED screen. Second, best direction and omni-directional path losses are analyzed. Compared with the close-in path loss model, the optimal path loss offset in the alpha-beta path loss model exceeds 86 dB in the LoS case, and accordingly, the exponent decreases to 1.57 and below. Third, more than 10 clusters are observed in OLoS and NLoS cases, compared to 2.17 clusters on average in the LoS case. Fourth, the average power dispersion of MPCs is smaller in both temporal and angular domains in the LoS case, compared with the NLoS and OLoS counterparts. Finally, in contrast to hallway scenarios measured in previous works at the same frequency band, the lobby which is larger in dimension and square in shape, features larger path losses and smaller delay and angular spreads.

翻译：太赫兹（0.1-10 THz）频段已被视为支持超宽带第六代（6G）及未来通信的潜在频段之一。本文在500平方米的室内大厅中，针对306-321 GHz频段开展了一项宽带信道测量活动。测量系统包括基于矢量网络分析仪（VNA）的信道探测仪，以及接收端配备的定向天线，用于解析角度域的多径分量（MPCs）。具体而言，在大厅中测量了21个位置和3780个信道脉冲响应（CIRs），涵盖视距（LoS）、非视距（NLoS）和阻挡视距（OLoS）三种情况。多径特性总结如下：第一，大厅中的主要散射体包括玻璃、柱子和LED屏幕。第二，分析了最佳方向和全向路径损耗。与近参考距离路径损耗模型相比，α-β路径损耗模型中的最优路径损耗偏移在LoS情况下超过86 dB，相应地，损耗指数降至1.57及以下。第三，在OLoS和NLoS情况下观察到超过10个簇，而LoS情况下平均为2.17个簇。第四，与NLoS和OLoS情况相比，LoS情况下MPCs在时域和角度域的功率色散更小。最后，与先前在相同频段走廊场景中的测量结果相比，尺寸更大且形状呈方形的大厅具有更大的路径损耗以及更小的时延扩展和角度扩展。