Performance evaluation on NOMA and transmit BF with user selection by the number of beams

As a technique for improving the transmission rate within a limited frequency band, Multiuser MIMO (MU-MIMO), which realizes MIMO transmission with multiple user terminals, has been attracted much attention. However, it is not possible to communicate with the users that exceed the number of base station (BS) antennas in the MU-MIMO transmission. We have proposed a method by using non orthogonal multiple access (NOMA) and Zero Forcing (ZF) at the BS and Minimum Mean Square Error (MMSE) at user terminals (UTs). In this paper, we evaluate the performance when the number of beams with NOMA applied is increased up to four by computer simulation using actual propagation channel. Furthermore, we propose a scheduling algorithm for 6-user and 3-beam at the BS that reduce the performance degradation by interference among users and verify that the improvement on the bit error rate by the propose method.