Fig. 2From: Using tensor contractions to derive the structure of slice-wise multiplications of tensors with applications to space–time Khatri–Rao coding for MIMO-OFDM systemsA MIMO system with \(M_{{\mathrm{T}}}=2\) transmit antennas and \(M_{\mathrm{R}}=3\) receive antennas (left-hand side). Visualization of the generalized unfolding \([\tilde{{\varvec{{{\mathcal {H}}}}}}]_{([1,3],[2,4])}\) for the MIMO-OFDM (right-hand side)Back to article page