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Propagation channel characteristics are substantially different in sub-6 GHzand millimeter-wave (mmWave) bands. A typical mmWave link experiences more thanan order-of-magnitude larger path loss and is more susceptible to blockagesthan a traditional sub-6 GHz link. Therefore, extensive measurement campaignswith efficient channel sounders are needed for a complete understanding of themmWave propagation channel characteristics. In addition, solutions should besought to overcome the outage problems associated with the mmWave bands and toachieve acceptable communication performance. In this paper, our 28 GHz channelsounder is introduced that can be used with horn antennas as well as phasedarray antennas. The two antenna types are then compared in terms of speed theyswitch from one direction to another and extracted multipath component (MPC)properties, such as path gain. We then propose the use of passive reflectorsand an active repeater for coverage enhancement by improving the receivedsignal strength. In particular, ECHO reflector and TURBO repeater areintroduced, and measurement results using them are presented.

28 GHz mmWave Channel Measurements: A Comparison of Horn and Phased Array Antennas and Coverage Enhancement Using Passive and Active Repeaters