Minimum number of antennas and degrees of freedom of multiple-input-multiple-output multi-user two-way relay X channels
- Authors
- Kim, Tae-Hoon; Jin, Dong-Sup; Kim, Jaehong; No, Jong-Seon; Chung, Habong
- Issue Date
- 5-Mar-2015
- Publisher
- INST ENGINEERING TECHNOLOGY-IET
- Keywords
- antenna arrays; relay networks (telecommunication); array signal processing; numerical analysis; numerical analysis; conventional signal space alignment scheme; beamforming vectors; MIMO multiuser two-way relay X channels; DOF; degree-of-freedom; multiple-input multiple-output multiuser two-way relay X channels; antenna number reduction
- Citation
- IET COMMUNICATIONS, v.9, no.4, pp.568 - 575
- Journal Title
- IET COMMUNICATIONS
- Volume
- 9
- Number
- 4
- Start Page
- 568
- End Page
- 575
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/10098
- DOI
- 10.1049/iet-com.2014.0714
- ISSN
- 1751-8628
- Abstract
- In this study, the minimum number of antennas at each user is derived to obtain 2M(2) degrees of freedom (DOF) in the M x 1 x M multiple-input-multiple-output (MIMO) multi-user two-way relay X channels. Based on the design of beamforming vectors for the conventional signal space alignment scheme, it is shown that each user needs at least remvoeM(2)- (M/2) antennas to obtain DOF 2M(2) with the relay having M-2 antennas. As the number of users increases, the number of antennas also increases, which makes the implementation difficult. 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. Through the numerical analysis, it is confirmed that the proposed scheme with time extension is a good alternative scheme to replace the conventional scheme.
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