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This paper presents outdoor wideband small-scale spatial fading andautocorrelation measurements and results in the 73 GHz millimeter-wave (mmWave)band conducted in downtown Brooklyn, New York. Both directional andomnidirectional receiver (RX) antennas are studied. Two pairs of transmitter(TX) and RX locations were tested with one line-of-sight (LOS) and onenon-line-of-sight (NLOS) environment, where a linear track was employed at eachRX to move the antenna in half-wavelength increments. Measured data reveal thatthe small-scale spatial fading of the received signal voltage amplitude aregenerally Ricean-distributed for both omnidirectional and directional RXantenna patterns under both LOS and NLOS conditions in most cases, except forthe log-normal distribution for the omnidirectional RX antenna pattern in theNLOS environment. Sinusoidal exponential and typical exponential functions arefound to model small-scale spatial autocorrelation of the received signalvoltage amplitude in LOS and NLOS environments in most cases, respectively.Furthermore, different decorrelation distances were observed for different RXtrack orientations, i.e., for different directions of motion relative to theTX. Results herein are valuable for characterizing small-scale spatial fadingand autocorrelation properties in multiple-input multiple-output (MIMO) systemsfor fifth-generation (5G) mmWave frequencies.

Millimeter Wave Small-Scale Spatial Statistics in an Urban Microcell Scenario