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• W2087289301 abstract "We study the degrees of freedom (DoF) of MIMO two-way X relay channels. Previous work studied the case $N < 2M$, where $N$ and $M$ denote the number of antennas at the relay and each source, respectively, and showed that the maximum DoF of $2N$ is achievable when $N leq lfloorfrac{8M}{5}rfloor$ by applying signal alignment (SA) for network coding and interference cancelation. This work considers the case $N>2M$ where the performance is limited by the number of antennas at each source node and conventional SA is not feasible. We propose a textit{generalized signal alignment} (GSA) based transmission scheme. The key is to let the signals to be exchanged between every source node align in a transformed subspace, rather than the direct subspace, at the relay so as to form network-coded signals. This is realized by jointly designing the precoding matrices at all source nodes and the processing matrix at the relay. Moreover, the aligned subspaces are orthogonal to each other. By applying the GSA, we show that the DoF upper bound $4M$ is achievable when $M leq lfloorfrac{2N}{5}rfloor$ ($M$ is even) or $M leq lfloorfrac{2N-1}{5}rfloor$ ($M$ is odd). Numerical results also demonstrate that our proposed transmission scheme is feasible and effective." @default.
• W2087289301 created "2016-06-24" @default.
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• W2087289301 date "2014-06-01" @default.
• W2087289301 modified "2023-10-14" @default.
• W2087289301 title "Generalized signal alignment for MIMO two-way X relay channels" @default.
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• W2087289301 doi "https://doi.org/10.1109/icc.2014.6884019" @default.
• W2087289301 hasPublicationYear "2014" @default.
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