Samad Md Abdus, Diba Feyisa Debo, Kim Young-Jin, Choi Dong-You
Department of Information and Communication Engineering, Chosun University, Gwangju 61452, Korea.
Department of Electronics and Telecommunication Engineering, International Islamic University Chittagong, Chittagong 4318, Bangladesh.
Sensors (Basel). 2021 Nov 21;21(22):7747. doi: 10.3390/s21227747.
The indoor application of wave propagation in the 5G network is essential to fulfill the increasing demands of network access in an indoor environment. This study investigated the wave propagation properties of line-of-sight (LOS) links at two long corridors of Chosun University (CU). We chose wave propagation measurements at 3.7 and 28 GHz, since 3.7 GHz is the closest to the roll-out frequency band of 3.5 GHz in South Korea and 28 GHz is next allocated frequency band for Korean telcos. In addition, 28 GHz is the promising millimeter band adopted by the Federal Communications Commission (FCC) for the 5G network. Thus, the 5G network can use 3.7 and 28 GHz frequencies to achieve the spectrum required for its roll-out frequency band. The results observed were applied to simulate the path loss of the LOS links at extended indoor corridor environments. The minimum mean square error (MMSE) approach was used to evaluate the distance and frequency-dependent optimized coefficients of the close-in (CI) model with a frequency-weighted path loss exponent (CIF), floating-intercept (FI), and alpha-beta-gamma (ABG) models. The outcome shows that the large-scale FI and CI models fitted the measured results at 3.7 and 28 GHz.
5G网络中波传播的室内应用对于满足室内环境中不断增长的网络接入需求至关重要。本研究调查了朝鲜大学（CU）两条长走廊上视线（LOS）链路的波传播特性。我们选择了在3.7 GHz和28 GHz进行波传播测量，因为3.7 GHz最接近韩国3.5 GHz的推出频段，而28 GHz是韩国电信公司的下一个分配频段。此外，28 GHz是美国联邦通信委员会（FCC）为5G网络采用的有前景的毫米波频段。因此，5G网络可以使用3.7 GHz和28 GHz频率来实现其推出频段所需的频谱。观察到的结果被应用于模拟扩展室内走廊环境中LOS链路的路径损耗。使用最小均方误差（MMSE）方法来评估具有频率加权路径损耗指数（CIF）的近距离（CI）模型、浮动截距（FI）模型和α-β-γ（ABG）模型的距离和频率相关的优化系数。结果表明，大规模的FI和CI模型在3.7 GHz和28 GHz时与测量结果拟合良好。
