New interference alignment schemes with full and half-duplex relays for the quasi-static X channel
- Authors
- Jin, Dong-Sup; No, Jong-Seon; Shin, Dong-Joon
- Issue Date
- Feb-2014
- Publisher
- INST ENGINEERING TECHNOLOGY-IET
- Citation
- IET COMMUNICATIONS, v.8, no.3, pp.351 - 359
- Indexed
- SCIE
SCOPUS
- Journal Title
- IET COMMUNICATIONS
- Volume
- 8
- Number
- 3
- Start Page
- 351
- End Page
- 359
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/160767
- DOI
- 10.1049/iet-com.2013.0178
- ISSN
- 1751-8628
- Abstract
- In this study, two relay-aided interference alignment (IA) schemes are proposed for the quasi-static M x 2 X channel where M is the number of transmitters and two is the number of receivers, respectively. The first scheme utilises one full-duplex relay and the second one utilises two half-duplex relays. In the proposed schemes, the transmitters transmit signals in every time slot and the relays operate in the amplify-and-forward (AF) mode. By verifying the linear independence between the desired signals and the interference, it is shown that the proposed schemes can achieve 2M/(M + 1) degrees of freedom (DoF) which is the maximum DoF for the M x 2 X channel. It is also shown by using the concept of reciprocity that the proposed IA schemes are applicable to the 2 x M X channel. Finally, through the numerical analysis, it is confirmed that the proposed IA schemes provide good alternatives to the previously known relay-aided IA scheme.
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