Figure 2From: Iterative channel estimation and data detection for MIMO-OFDM systems operating in time-frequency dispersive channels under unknown background noiseConvergence of data detection, QPSK, Nf d T s = 0.075 . Convergence performance of the proposed EM-based scheme in Section 3 (marked as scheme 1) and the proposed EM-based scheme in Section 4 (marked as scheme 2) with signal-to-noise ratio (SNR) equal to 10, 20, and 30 dB.Back to article page