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Degrees of Freedom for MIMO Two-Way X Relay Channel

Zhengzheng Xiang, Meixia Tao, Jianhua Mo, Xiaodong Wang
2013 IEEE Transactions on Signal Processing  
We study the degrees of freedom (DOF) of a multiple-input multiple-output (MIMO) two-way X relay channel, where there are two groups of source nodes and one relay node, each equipped with multiple antennas  ...  , and each of the two source nodes in one group exchanges independent messages with the two source nodes in the other group via the relay node.  ...  MIMO TWO-WAY X RELAY CHANNEL Consider a MIMO two-way X relay channel shown in Fig. 1. The channel consists of four source nodes with M antennas each and a relay with N antennas.  ... 
doi:10.1109/tsp.2013.2238535 fatcat:4urb4vqmnbfohokrviqf4rto2m

Achievable degrees of freedom of MIMO two-way X relay channel with delayed CSIT

Qingyun Li, Gang Wu, Hongxiang Li, Shaoqian Li
2016 Science China Information Sciences  
Achievable degrees of freedom of MIMO two-way X relay channel with delayed CSIT.  ...  In this paper, assuming that each node has delayed CSIT, we study the achievable degrees of freedom (DOF) for MIMO two-way X relay channel in frequency division duplex (FDD) systems.  ...  Acknowledgements This work was supported by Regional Cooperation Project of MOST of China (Grant No. 2014DFT10290). Conflict of interest The authors declare that they have no conflict of interest.  ... 
doi:10.1007/s11432-015-0772-6 fatcat:7v5oiwdvhzfexkai2wajp4eedy

Signal Space Alignment for an Encryption Message and Successive Network Code Decoding on the MIMO K-way Relay Channel [article]

Namyoon Lee, Joohwan Chun
2010 arXiv   pre-print
This network information flow is termed a MIMO Gaussian K-way relay channel. For this channel, we show that K/2 degrees of freedom is achievable if M=K-1.  ...  This paper investigates a network information flow problem for a multiple-input multiple-output (MIMO) Gaussian wireless network with K-users and a single intermediate relay having M antennas.  ...  Therefore, the achievable degrees of freedom of the MIMO Gaussian 4-way relay channel according to two schemes is summarized as shown in TABLE I .  ... 
arXiv:1010.0937v1 fatcat:wh3ucyznhfhszlfbomn7dcyo7q

Degrees of Freedom for Complex MIMO Multiple-Way Relay Channel

Xiao Chen, Yan Zhu, Xinxing Yin, Fangbiao Li, Zhi Xue
2014 International Journal of Multimedia and Ubiquitous Engineering  
In this paper, we study the DOF of multiple-input multiple-output (MIMO) multiple-way relay channel.  ...  Then we extend it to the complex MIMO multiple-way relay channel and present the corresponding upped bound.  ...  This work was supported in part by the Natural Science Foundation of China under Grant No. 60932003, No. 61271220 and No. 61171173.  ... 
doi:10.14257/ijmue.2014.9.11.04 fatcat:26fklqgjwzf4vkwmgswnlxgohe

Relay-Assisted Interference Channel: Degrees of Freedom [article]

Ramy Abdallah Tannious, Aria Nosratinia
2011 arXiv   pre-print
To answer this question, we first establish the degrees of freedom of the interference channel with a MIMO relay, showing that a K-pair network with a MIMO relay has K/2 degrees of freedom.  ...  This paper investigates the degrees of freedom of the interference channel in the presence of a dedicated MIMO relay. The relay is used to manage the interference at the receivers.  ...  First, we establish that the degrees of freedom of the interference MIMO relay channel to be only K 2 .  ... 
arXiv:1112.5756v1 fatcat:gomcbyb2gzhl7j3x6bajpp6a4q

Achievable degrees of freedom on K-user MIMO multi-way relay channel with common and private messages

Mohamed Salah, Amr El-keyi, Yahya Mohasseb, Mohammed Nafie
2015 2015 49th Asilomar Conference on Signals, Systems and Computers  
This paper investigates the achievable total degrees of freedom (DoF) of the MIMO multi-way relay channel that consists of K users, where each user is equipped with M antennas, and a decode-and-forward  ...  Due to the absence of direct links between the users, communication occurs through the relay in two phases; a multiple access channel phase (MAC) and a broadcast (BC) phase.  ...  UPPER BOUNDS ON THE DEGREES OF FREEDOM In this section, we provide upper bounds on the total DoF of the Gaussian MIMO mRC with common and private messages.  ... 
doi:10.1109/acssc.2015.7421283 dblp:conf/acssc/SalahEMN15 fatcat:cne7meltuvf3dhfte4g2vevzy4

The degrees of freedom of the K-pair-user full-duplex two-way interference channel with a MIMO relay

Zhiyu Cheng, Natasha Devroye
2014 2014 IEEE International Symposium on Information Theory  
In a K-pair-user two-way interference channel (TWIC), 2K messages and 2K transmitters/receivers form a K-user IC in the forward direction (K messages) and another K-user IC in the backward direction which  ...  In this paper, we characterize the DoF of the K-pair-user TWIC with a MIMO, full-duplex relay.  ...  degrees of freedom.  ... 
doi:10.1109/isit.2014.6875327 dblp:conf/isit/ChengD14 fatcat:ajyj4heruzavtf6mvyzrm5h7iy

The Degrees of Freedom of the K-pair-user Full-Duplex Two-way Interference Channel with and without a MIMO Relay [article]

Zhiyu Cheng, Natasha Devroye
2013 arXiv   pre-print
In a K-pair-user two-way interference channel (TWIC), 2K messages and 2K transmitters/receivers form a K-user IC in the forward direction (K messages) and another K-user IC in the backward direction which  ...  We next characterize the DoF of the K-pair-user TWIC with a MIMO, full-duplex relay.  ...  Theorem 2: The full-duplex K-pair-user two-way interference channel with an instantaneous 2K-antenna relay has 2K degrees of freedom.  ... 
arXiv:1311.6880v1 fatcat:sfhyoddc3bfgne366peukvtxle

The Degrees of Freedom of Full-Duplex Bidirectional Interference Networks With and Without a MIMO Relay

Zhiyu Cheng, Natasha Devroye, Tang Liu
2016 IEEE Transactions on Wireless Communications  
We derive a new outer bound, and use interference alignment to demonstrate that the optimal degrees of freedom (DoF, also known as the multiplexing gain) is K: full-duplex operation doubles the DoF, but  ...  We next characterize the DoF of a full-duplex bi-directional interference network with a MIMO, full-duplex relay.  ...  DOF OF FULL-DUPLEX BI-DIRECTIONAL INTERFERENCE NETWORK WITH A CAUSAL MIMO RELAY It is known that for one-way channels where nodes are either sources or destinations of messages but not both as in a two-way  ... 
doi:10.1109/twc.2015.2512983 fatcat:qyedi3numvbanbygzob74tn23i

Wireless MIMO switching with trusted and untrusted relays: Degrees of freedom perspective

Fanggang Wang, Xiaojun Yuan, Jemin Lee, Tony Q. S. Quek
2015 2015 IEEE International Conference on Communications (ICC)  
Index Terms-Degrees of freedom, MIMO switching, physicallayer network coding, multiway relay, secrecy sum rate.  ...  We investigate the degrees of freedom (DoF) and secrecy DoF for a general framework of multiway relay networks named wireless MIMO switching, where a number of users exchange information via a common relay  ...  Degrees of freedom (DoF) is an important performance measure to characterize the multiplexing gain in the high signal-to-noise regime.  ... 
doi:10.1109/icc.2015.7249106 dblp:conf/icc/WangYLQ15 fatcat:x36d6noqm5gfpkkti4qcgd6rsi

Generalized signal alignment for MIMO two-way X relay channels

Kangqi Liu, Meixia Tao, Zhengzheng Xiang, Xin Long
2014 2014 IEEE International Conference on Communications (ICC)  
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 ≤8M/5 by applying  ...  Fig. 4 . 4 Total DoF for the MIMO two-way X relay channel under generalized signal alignment transmission scheme. Fig. 5 . 5 Total DoF for the MIMO two-way X relay channel when M = 2N 5 .  ... 
doi:10.1109/icc.2014.6884019 dblp:conf/icc/LiuTXL14 fatcat:jjgdnqlsuba7fflsuecp3zzpfe

Minimum number of antennas and degrees of freedom of multiple-input–multiple-output multi-user two-way relay X channels

Tae-Hoon Kim, Dong-Sup Jin, Jong-Seon No, Jaehong Kim, Habong Chung
2015 IET Communications  
In this study, the minimum number of antennas at each user is derived to obtain 2M 2 degrees of freedom (DOF) in the M × 1 × M multiple-input-multiple-output (MIMO) multi-user two-way relay X channels.  ...  In an effort to reduce the number of antennas, the authors propose a new beamforming scheme of MIMO multi-user two-way relay X channels using the time extension.  ...  In order to obtain 2M 2 degrees of freedom (DOF), we derive the least number of antennas at each user based on the scheme for M × 1 × M MIMO multi-user two-way relay X channels in [16] . Long et al.  ... 
doi:10.1049/iet-com.2014.0714 fatcat:ozyn5gk55rasbjovsgghohj2oi

Degrees of Freedom in Multiuser MIMO [article]

Syed A. Jafar, Maralle J. Fakhereddin
2005 arXiv   pre-print
We explore the available degrees of freedom for various multiuser MIMO communication scenarios such as the multiple access, broadcast, interference, relay, X and Z channels.  ...  For the two user MIMO interference channel, we find a general inner bound and a genie-aided outer bound that give us the exact number of degrees of freedom in many cases.  ...  CONCLUSIONS We investigate the available degrees of freedom for various multiuser MIMO communication scenarios such as the multiple access, broadcast, interference, relay, X and Z channels.  ... 
arXiv:cs/0510055v1 fatcat:xfxl3iobvbbj3gyp7mizkj5jie

Degrees of Freedom Region for the MIMO X Channel [article]

Syed A. Jafar, Shlomo Shamai
2007 arXiv   pre-print
We provide achievability as well as converse results for the degrees of freedom region of a MIMO X channel, i.e., a system with two transmitters, two receivers, each equipped with multiple antennas, where  ...  The same degrees of freedom are obtained on the MIMO X channel with a cognitive receiver as well.  ...  Next we explore the degrees of freedom when some messages may be shared between the two transmitters on the MIMO X channel. B.  ... 
arXiv:cs/0607099v3 fatcat:lmf2smj6wja4zewu5vp76taqey

Degrees of freedom of half-duplex MIMO multi-way relay channel with full data exchange

Tao Huang, Xiaojun Yuan, Jinhong Yuan
2014 2014 IEEE Global Communications Conference  
In this paper, we investigate the degrees of freedom (DoF) of the half-duplex multiple-input multiple-output (MIMO) multi-way relay channel (MWRC) with full data exchange, where each user wants to learn  ...  Based on that, we derive the DoF capacity of the halfduplex MIMO MWRC with full data exchange.  ...  In a two-way relay channel (TWRC), two users with no direct link want to exchange information via a single relay.  ... 
doi:10.1109/glocom.2014.7037489 dblp:conf/globecom/HuangYY14 fatcat:om27hcagv5h2jf6hrecdl3z3ne
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