Investigation of Millimeter-Wave Indoor Propagation at Different Frequencies

The characteristics of millimeter-wave (mmWave) multipath propagation based on the parameters of path loss, delay spread and received power has been presented in this paper. The performance of different mmWave bands at 28, 39, 60 and 73 GHz for indoor communication has been included in this investigation and for both Line-of-Sight (LOS) and Non-Line-of-Sight (NLOS) scenarios. The effects of different building materials, frequency sensitivity materials and multi-floor indoor communications were the main considerations in this work. Such consideration has been carried out based on the calculation of each material parameters represented by relative permittivity and conductivity which obtained via software designed and clarified in this work. The results obtained from Wireless InSite software indicates that there is an inverse relationship between the separation distance and both the delay spread and received power. In contrast, path loss increase with increasing the separation distance due to many reasons related to antennas directionality and properties. Furthermore, Results obtained from multi-floor mmWave communication indicate that by using lower frequencies of 28 and 39 GHz, multi-floor effects on the investigated parameters have reduced the received power and increased the path losses to approximately its double values. Resulting in a valuable consideration for performing such deployment. While for 60 and 73 GHz, it shows ineffectiveness to be utilized for such communication.