On the Degrees of Freedom of the Symmetric Multi-Relay MIMO Y Channel
Publication in refereed journal
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香港中文大學研究人員

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摘要In this paper, we study the degrees of freedom (DoF) of the symmetric multi-relay multiple-input multipleoutput (MIMO) Y channel, where three user nodes, each with M antennas, communicate via K geographically separated relay nodes, each with N antennas. For this model, we establish a general DoF achievability framework based on linear precoding and post-processing methods. The framework poses a nonlinear problem with respect to user precoders, user post-processors and relay precoders. To solve this problem, we adopt an uplinkdownlink asymmetric strategy, where the user precoders are designed for signal alignment and the user post-processors are used for interference neutralization. With the user precoder and post-processor designs fixed as such, the original problem then reduces to a problem of relay precoder design. To address the solvability of the system, we propose a general method for solving matrix equations. Together with the techniques of antenna disablement and symbol extension, an achievable DoF of the considered model is derived for an arbitrary setup of (K,M,N). We show that for K≥2, the optimal DoF is achieved for MN∈[0,max{3K√3,1})∪[3k+9K2−12k√6,∞). We also show that the uplink-downlink asymmetric design proposed in this paper considerably outperforms the conventional approach based on uplink-downlink symmetry.
出版社接受日期01.05.2017
著者T. Ding, X. Yuan, S. C. Liew
期刊名稱IEEE Transactions on Wireless Communications
詳細描述Available as early access in IEEE Xplore
出版年份2017
卷號16
期次9
出版社IEEE
國際標準期刊號1536-1276
電子國際標準期刊號1558-2248
語言美式英語

上次更新時間 2021-05-05 於 01:23