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We investigate efficient communications over MIMO two-way relay channels (TWRCs) of n_{T}<n_{R}, where n_{T} denotes the number of antennas at each user and n_{R} denotes that at the relay. We propose a new reduced-dimension (RD) cooperative precoding scheme. In the proposed scheme, the two users cooperatively create n_{T} aligned eigen-modes, supporting n_{T} streams of physical-layer network...
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