Abstract
Millimeter-wave (mmWave) communication is one of the most promising technologies in the fifth generation (5G) mobile networks due to its capability to access a large amount of available spectrum resources. Despite theoretical potential of a high data rate, there are still several key technical challenges to use mmWave in mobile networks, such as severe path loss, high penetration loss, and narrow beamwidth. Hence, accurate and reliable knowledge on mmWave channel propagation characteristics is essential for developing 5G wireless communication systems. In this article, the fundamental characteristics of mmWave are presented first. Then two main channel modeling methods are discussed. In order to investigate the channel characteristics at mmWave bands, measurements using three different large-scale array topologies are carried out, and typical channel parameters are extracted and analyzed.
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