Figure 3From: Orthogonal beamforming using Gram-Schmidt orthogonalization for multi-user MIMO downlink systemNumber of feedback bits of the proposed method, LF-OSDMA, and the extended LF-OSDMA for an increase of the number of users K , Q CSI = 20, S is the number of users selected by the base station, M is the number of subcodebooks, Q SINR = 3 and the number of transmit antennas is N t = 4.Back to article page