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Topological Interference Management with Alternating Connectivity: The Wyner-Type Three User Interference Channel
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Interference management in a three-user interference channel with alternating connectivity with only topological knowledge at the transmitters is considered. The network has a Wyner-type channel flavor, i.e., for each connectivity state the receivers observe at most one interference signal in addition to their desired signal. Degrees of freedom (DoF) upper bounds and lower bounds are derived. The lower bounds are obtained from a scheme based on joint encoding across the alternating states. Given a uniform distribution among the connectivity states, it is shown that the channel has 2+ 1/9 DoF. This provides an increase in the DoF as compared to encoding over each state separately, which achieves 2 DoF only.
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Revisiting Topological Interference Management: A Learning-to-Code on Graphs Perspective
A graph neural network and reinforcement learning assign beamforming vectors to wireless network topologies, automatically producing interference alignment schemes and a few new subspace alignment examples.
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