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This paper investigates the impact of the number of antennas (8 to 64) andthe array configuration on massive MIMO channel parameters estimation formultiple propagation scenarios at 3.5 GHz. Different measurement environmentsare artificially created by placing several reflectors and absorbers in ananechoic chamber. Ground truth channel parameters, e.g, path angles, areobtained by geometry and trigonometric rules. Then, these are compared to thechannel parameters extracted by the applying Space-Alternating GeneralizedExpectation-Maximization (SAGE) algorithm on the measurements. Overall, theestimation errors for various array configurations and the multipleenvironments are compared. This paper will help to determine the appropriateconfiguration of the antenna array and the parameter extraction algorithm foroutdoor massive MIMO channel sounding campaigns.

How Many Antennas Do We Need for Massive MIMO Channel Sounding? - Validating Through Measurement