Fig. 7From: Rotman lens-based two-tier hybrid beamforming for wideband mmWave MIMO-OFDM system with beam squintSpectral efficiency achieved by different precoding schemes versus the number of users in multiuser mmWave MIMO-OFDM systems under SNR=− 15 dB, Nt=256, Nr=16, total bandwidth B=1.2 GHz, fc=60 GHz, \(N_{\text {RF}}^{t}=U N_{s}\), \(N_{\text {RF}}^{r}=N_{s}\)Back to article page