Performance comparison of multi-beam massive MIMO by the switch configuration

Massive MIMO enables the improvement on the transmission rate without increasing the burden on the signal processing by employing a large number of antennas at a base station (BS). However, it is reported that CSI estimation itself has a large overhead when considering massive MIMO. The authors have proposed analog-digital hybrid massive MIMO configuration which eliminates CSI estimation itself by applying analog multi-beam and their selection and blind algorithm. Moreover, the effectiveness of the proposed system is shown when ideal beam selection is applied by a matrix switch. On the other hand, it is not realistic to use the matrix switch when considering massive MIMO. In this paper, we propose multi-beam massive MIMO configuration using many-to-one switch. Via a computer simulation, the performance of each configurations is verified.