Optimal Degrees of Freedom Region for the Asymmetric MIMO Y Channel

Liu, Kangqi; Yuan, Xiaojun; Tao, Meixia

doi:10.1109/lcomm.2016.2606413

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…However, this results in a DoF achievability problem far more complicated than (9), since we need to analyze the feasibility of all possible DoF tuples of (d 0,1 , d 1,0 , d 1,2 , d 2,1 , d 0,2 , d 2,0 ) under an asymmetric antenna configuration. The optimal DoF region for the single-relay case has been recently reported in [30]. We believe that the techniques used in [30] will provide some insights on deriving the DoF region of the multi-relay case.…”

Section: B General Antenna and Dof Setupsmentioning

confidence: 90%

“…) under an asymmetric antenna configuration. The optimal DoF region for the single-relay case has been recently reported in [30]. We believe that the techniques used in [30] will provide some insights on deriving the DoF region of the multi-relay case.…”

Section: B General Antenna and Dof Setupsmentioning

confidence: 90%

“…It can be readily shown that, with d in (30) and N in (36), there always exist {V j } satisfying (43). Thus, to prove the achievability of a certain DoF point M N , d , it suffices to show that there exist { Fk } satisfying (42).…”

Section: (42b)mentioning

confidence: 99%

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On the Degrees of Freedom of the Symmetric Multi-Relay MIMO Y Channel

Ding

Yuan

Liew

2017

IEEE Trans. Wireless Commun.

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In this paper, we study the degrees of freedom (DoF) of the symmetric multi-relay multiple-input multiple-output (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 uplink-downlink 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, ∞ . We also show that the uplink-downlink asymmetric design proposed in this paper considerably outperforms the conventional approach based on uplink-downlink symmetry.

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Section: B General Antenna and Dof Setupsmentioning

confidence: 90%

Section: B General Antenna and Dof Setupsmentioning

confidence: 90%

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On the Degrees of Freedom of the Symmetric Multi-Relay MIMO Y Channel

Ding

Yuan

Liew

2017

IEEE Trans. Wireless Commun.

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“…The authors in [97] improved the result in [94] and showed that the optimal DoF region of the three-user asymmetric MIMO Y channel is achievable by utilizing antenna deactivation, pairwise and cyclic signal alignments.…”

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confidence: 95%

“…The work in [94]- [97] investigated the DoF region of the MIMO Y channel. In general, it is more difficult to characterize the DoF-region than the total DoF since the DoFregion characterization involves analyzing the asymmetric data transmissions, which necessitates the multi-dimensional DoF analysis.…”

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confidence: 99%

An Overview on Multiway Relay Communications: Fundamental Issues, Recent Advances, and New Challenges

Wang,

Yuan

2020

Preprint

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To address the coverage and capacity challenges in fifth-generation (5G) wireless networks, the relay technique has been considered as a promising solution and recently attracted great attentions from academia. The multiway relay channel (mRC), which serves as a fundamental building block of a relay network, defines the family of all possible information-flow patterns between a relay node and its neighboring nodes. Combined with several new techniques, such as physical-layer network coding (PLNC), signal and interference alignments, multi-input multi-output (MIMO), etc., the mRC exhibits superior capability to assist multiuser information exchange. In this article, we aim to provide a comprehensive overview on the state-of-the-art of the mRC from the perspectives of both information-theoretic and communication-theoretic studies. The key results are summarized and discussed to identify the current research progress of the mRC. Open problems and research challenges are also discussed to spur future research towards the mRC.Index Terms-Multiway relay channel (mRC), physical-layer network coding (PLNC), multi-output multi-input (MIMO), degrees of freedom (DoF), precoding, relay selection.

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Optimal DoF Region of MIMO Y Channel with Hybrid Data Exchanges

Wang

Yuan

et al. 2018

2018 IEEE Global Communications Conference (GLOBECOM)

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Optimal Degrees of Freedom Region for the Asymmetric MIMO Y Channel

Cited by 7 publications

References 15 publications

On the Degrees of Freedom of the Symmetric Multi-Relay MIMO Y Channel

On the Degrees of Freedom of the Symmetric Multi-Relay MIMO Y Channel

An Overview on Multiway Relay Communications: Fundamental Issues, Recent Advances, and New Challenges

Optimal DoF Region of MIMO Y Channel with Hybrid Data Exchanges

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