Abstract
Millimeter-wave (mmW) wireless is as a promising technology for meeting the Gigabit rate and low latency requirements of emerging fixed and mobile 5G applications. This is enabled by the large (GHz) bandwidths and high-gain beamforming due to high-dimensional antenna arrays possible at mmW frequencies. Initial propagation measurements underscore the highly directional nature of mmW communication, dominated by line-of-sight and single-bounce multipath, making beamforming a critical operational functionality. However, existing channel measurements are limited to mechanically pointed horn antennas and single-beam phased arrays of moderate sizes. On the other hand, multi-beam operation is necessary for spatial multiplexing. In this paper, we introduce a new measurement methodology and initial results based on beamspace MIMO channel modeling and communication. The measurement results are based on a novel beamspace MIMO prototype system that uses a lens array for analog beamforming and enables, for the first time, simultaneous multi- beam channel measurements with a beamwidth of about 4 degrees equivalent to that of a two- dimensional array with 636 critically spaced elements. Initial indoor channel measurements follow Friis formula for pathloss, and illustrate the new beamspace channel measurement and modeling methodology.
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