Phase Calibration of a Massive MIMO System for Direction of Arrival Applications

In this paper we perform a Uniform Linear Array (ULA), Multiple Input Multiple Output (MIMO) system calibration, to measure the Direction of Arrival (DoA) of multiple User Equipment (UE). We consider wired, wireless, Over-the-Air (OTA) calibration operations. The calibrated signals are then processed using Matrix Pencil (MP) estimation technique to achieve the DoA measurements. The results show that DoA stability and accuracy can be achieved using both of the procedures. The results show that an offline calibration vector can be a replacement for real time calibration. It also shows the feasibility of mutual wireless calibration among distant wireless systems, to avoid the need for the costly, and permeant wired calibration connections.