Comparison of large scale parameters of mmWave wireless channel in 3 frequency bands

This paper investigates the large scale parameters (LSPs) of wireless channels with measurements at frequencies of 7.5 GHz, 28 GHz and 73 GHz for indoor light-of-sight (LOS) and non-light-of-sight (NLOS) scenarios. Comparison of the measured LSPs (RMS-DS, ASA, ESA) of these channels at different frequencies shows some differences between high and low frequency measurements. These studies indicate that more measurements will be needed for a full understanding of high-frequency millimeter-wave (mmWave) channels. This understanding is critically important for the successful application of high-frequency technologies in future 5G communication systems.