Fig. 4
From: Low computational complexity methods for decoding of STBC in the uplink of a massive MIMO system
BER performance comparison for deflation update and the number of current users M = 9, 17. BS is equipped with N = 320 antennas that serves M = 9, 17 users. Assuming that a user is removed from the system the proposed algorithm is used to update the inverse matrix for decoding. The results for M = 9 is shown in simulation a and simulation b demonstrates the comparison results for M = 17 after a user exits the cell. As it is predictable, the BER performance of the exact inverse matrix update algorithm is better than the approximation method