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We investigate the degrees of freedom (DoF) of coexisting 2 × 2 X channel and 2 × 2 interference channel with single antenna at each node. Asymptotic interference alignment approach is used to obtain the lower bound on the DoF: (n+1)5+3n5/(n+1)5+n5 based on symbol extension model. This bound will be tight when n tends to infinity, i.e., the limit 2 of lower bound on DoF will meet the upper bound.
In this paper, we focus on the cancellation of the interferences among Destination Users (DU's) in the nonregenerative Multiuser Multiple-Input Multiple-Output (MU-MIMO) downlink relay system. By the comparison with Block Diagonalization (BD) and conventional Dirty Paper Coding (DPC) based on LQ Decomposition(LQD), a novel design method of transmit weights for DPC is proposed to successively eliminate...
This paper focuses on the signal processing algorithm for the downlink of Multi-User Multiple-Input Multiple-Output (MU-MIMO). In this paper, a novel transmission scheme is proposed for the cancellation of IUI (Inter-User Interference) in MU-MIMO downlinks. Compared with the conventional DPC with single receive antenna, the users in the proposed scheme are equipped with multiple receive antennas,...
In this paper, we propose a novel method of Cholesky factorization based on the minimum mean square error (MMSE) criterion for Tomlinson-Harashima precoding (THP), which is applied to the downlink of multiuser multiple-input multiple-output (MU-MIMO) system with single mobile antenna equipped for each user. The proposed scheme is also applicable to the MU-MIMO system with multiple mobile antennas...
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