Massive-MIMO Enabled FDD Wireless Backhaul Small-Cell Relay Networks: AF Protocol Based Designs With Low Channel Estimation and Feedback Complexity by Changick Song

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Regularized artificial fast fading designs for secure transmission in multi-user MIMO wiretap channels by Changick Song, Kyoung-Jae Lee

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Designs of MIMO Amplify-and-Forward Wireless Relaying Networks: Practical Challenges and Solutions Based on MSE Decomposition by Changick Song, Kyoung-Jae Lee, Inkyu Lee

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Achievable Sum-Rate Analysis of Massive MIMO Full-Duplex Wireless Backhaul Links in Heterogeneous Cellular Networks by Prince Anokye, Roger Kwao Ahiadormey, Changick Song, Kyoung-Jae Lee

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A New RF Beam Training Method and Asymptotic Performance Analysis for Multi-User Millimeter Wave Systems by Taeseok Oh, Changick Song, Jaehoon Jung, Minki Ahn, Joonsuk Kim, Inkyu Lee

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