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. 2023 Jun 27;23(13):5963. doi: 10.3390/s23135963

Table 3.

System matrices and tensors.

Symbol Matrices
$S^{(l)} \in C^{N_{l} \times R_{l}}$ , for $l \in [1, L]$
$S = S^{(1)} \otimes . . . \otimes S^{(L)} \in C^{N \times R}$
$N = \prod_{l = 1}^{L} N_{l}, R = \prod_{l = 1}^{L} R_{l}$
Channel tensors
$H^{(S R)} \in C^{M_{R} \times M_{S} \times F}$
$H^{(R D)} \in C^{M_{D} \times M_{R} \times F}$
Space-time-frequency coding tensors
$G^{(S)} \in C^{M_{S} \times R_{1} \times . . . \times R_{L} \times F \times P}$
$G^{(R)} \in C^{M_{R} \times R_{1} \times . . . \times R_{L} \times F \times P}$
Received signals tensors
$X^{(S R)} \in C^{M_{R} \times N_{1} \times . . . \times N_{L} \times F \times P}$
$X^{(R D)} \in C^{M_{D} \times N_{1} \times . . . \times N_{L} \times F \times P}$