Guiding blind transmitters: Relay-aided interference alignment for the X channel

Ye Tian; Aylin Yener

doi:10.1109/ISIT.2012.6283517

Guiding blind transmitters: Relay-aided interference alignment for the X channel

Ye Tian, Aylin Yener

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

6 Scopus citations

Abstract

This paper investigates the impact of half-duplex relays on the degrees of freedom (DoF) of the K-user X channel when the transmitters are blind in the sense that no channel state information (CSI) at the transmitter (CSIT) is available. It is shown that adding relay nodes with CSI to the communication model is sufficient to recover the optimal DoF with CSIT. In particular, the relay nodes help steer the directions of the transmitted signals to facilitate interference alignment to achieve optimal DoF. It is shown that one relay node with K - 1 antennas is sufficient to achieve the optimal DoF. When relays do not have multiple antennas, it is sufficient to have (K - 1) ² relays to achieve the optimal DoF. The achievability is established using partial interference alignment and joint beamforming. DoF for the case when relays only have delayed CSI is also investigated.

Original language	English (US)
Title of host publication	2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012
Pages	1513-1517
Number of pages	5
DOIs	https://doi.org/10.1109/ISIT.2012.6283517
State	Published - 2012
Event	2012 IEEE International Symposium on Information Theory, ISIT 2012 - Cambridge, MA, United States Duration: Jul 1 2012 → Jul 6 2012

Publication series

Name	IEEE International Symposium on Information Theory - Proceedings

Other

Other	2012 IEEE International Symposium on Information Theory, ISIT 2012
Country/Territory	United States
City	Cambridge, MA
Period	7/1/12 → 7/6/12

All Science Journal Classification (ASJC) codes

Theoretical Computer Science
Information Systems
Modeling and Simulation
Applied Mathematics

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10.1109/ISIT.2012.6283517

Cite this

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title = "Guiding blind transmitters: Relay-aided interference alignment for the X channel",

abstract = "This paper investigates the impact of half-duplex relays on the degrees of freedom (DoF) of the K-user X channel when the transmitters are blind in the sense that no channel state information (CSI) at the transmitter (CSIT) is available. It is shown that adding relay nodes with CSI to the communication model is sufficient to recover the optimal DoF with CSIT. In particular, the relay nodes help steer the directions of the transmitted signals to facilitate interference alignment to achieve optimal DoF. It is shown that one relay node with K - 1 antennas is sufficient to achieve the optimal DoF. When relays do not have multiple antennas, it is sufficient to have (K - 1) 2 relays to achieve the optimal DoF. The achievability is established using partial interference alignment and joint beamforming. DoF for the case when relays only have delayed CSI is also investigated.",

author = "Ye Tian and Aylin Yener",

year = "2012",

doi = "10.1109/ISIT.2012.6283517",

language = "English (US)",

isbn = "9781467325790",

series = "IEEE International Symposium on Information Theory - Proceedings",

pages = "1513--1517",

booktitle = "2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012",

}

Tian, Y & Yener, A 2012, Guiding blind transmitters: Relay-aided interference alignment for the X channel. in 2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012., 6283517, IEEE International Symposium on Information Theory - Proceedings, pp. 1513-1517, 2012 IEEE International Symposium on Information Theory, ISIT 2012, Cambridge, MA, United States, 7/1/12. https://doi.org/10.1109/ISIT.2012.6283517

Guiding blind transmitters: Relay-aided interference alignment for the X channel. / Tian, Ye; Yener, Aylin.
2012 IEEE International Symposium on Information Theory Proceedings, ISIT 2012. 2012. p. 1513-1517 6283517 (IEEE International Symposium on Information Theory - Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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AU - Yener, Aylin

PY - 2012

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N2 - This paper investigates the impact of half-duplex relays on the degrees of freedom (DoF) of the K-user X channel when the transmitters are blind in the sense that no channel state information (CSI) at the transmitter (CSIT) is available. It is shown that adding relay nodes with CSI to the communication model is sufficient to recover the optimal DoF with CSIT. In particular, the relay nodes help steer the directions of the transmitted signals to facilitate interference alignment to achieve optimal DoF. It is shown that one relay node with K - 1 antennas is sufficient to achieve the optimal DoF. When relays do not have multiple antennas, it is sufficient to have (K - 1) 2 relays to achieve the optimal DoF. The achievability is established using partial interference alignment and joint beamforming. DoF for the case when relays only have delayed CSI is also investigated.

AB - This paper investigates the impact of half-duplex relays on the degrees of freedom (DoF) of the K-user X channel when the transmitters are blind in the sense that no channel state information (CSI) at the transmitter (CSIT) is available. It is shown that adding relay nodes with CSI to the communication model is sufficient to recover the optimal DoF with CSIT. In particular, the relay nodes help steer the directions of the transmitted signals to facilitate interference alignment to achieve optimal DoF. It is shown that one relay node with K - 1 antennas is sufficient to achieve the optimal DoF. When relays do not have multiple antennas, it is sufficient to have (K - 1) 2 relays to achieve the optimal DoF. The achievability is established using partial interference alignment and joint beamforming. DoF for the case when relays only have delayed CSI is also investigated.

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Guiding blind transmitters: Relay-aided interference alignment for the X channel

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