… DoF of the MIMO two-way X relay channel has also been studied in [10], [104]. For the case
of N ≥ 2M, the authors used generalized signal alignment … problem in the multi-user TWRC. …

… of simultaneous signal and channel alignment is generalized in … This section presents the
degrees of freedom (DoF) and sum-… alignment in partially connected multi-user two-way relay …

… study the channel estimation for the MIMO two-way relay system in the presence of interference
around all of the two sources and the relay, and thus, the optimal training signals should …

… , researchers in [5] introduced a multi-user two-way relaying … achievable DOF under
the assumption of imperfect channel … Generalized signal alignment for arbitrary MIMO two-way …

… signal space is used to reconstruct the degrees of freedom, and an orthogonalized spatial
alignment … uses the spatial freedom provided by the MIMO Two-way Relay Network (TWRC) to …

… The SI channel, which is the channel between the relay’s … to temporally align the desired
signal in the direct and relay links. … In order to extend the signal model in Section II to a multiuser …

… Moreover, the effective channels of the signals are aligned in … SNC scheme asymptotically
achieves full DoF in C-RAN with … and-forward [19] generalize the concept of PNC with multiple …

… to temporally align the desired signal in the direct and relay links. … In order to extend the signal
model in Section II to a multi-user … relay–user beamforming design in a full-duplex two-way …

… of the combined signal from different degrees of freedom, … for MIMO two-way X relay
channels. The key is to let the … Multi-user cooperative relay signal space alignment algorithm …

… to achieve the maximum degree of freedom (DoF) for K users … constant upper limit for
generalized area shapes. Besides, … BEIA when some interference signals cannot be aligned in N-…