Fig. 3
From: Low computational complexity methods for decoding of STBC in the uplink of a massive MIMO system
BER performance comparison for inflation update and the number of current users M = 8, 16.
BS is equipped with N = 320 antennas that serves M = 8, 16 users. In the event that a user is added to the system, the proposed algorithms are used to update the inverse matrix for decoding. The results for M = 8 is shown in simulation (a). Simulation b demonstrates the comparison results for M = 16 after a user is added. It is observed that using Neumann series to approximate the inverse matrix will degrade the BER performance compared to the exact matrix inverse update