Instantaneous degrees of freedom of downlink interference channels with multiuser diversity

Taejoon Kim, David J. Love, Bruno Clerckx

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Independent channel fading across different users in a wireless network enables the system to exploit multiuser diversity. In this paper, we investigate the impact of user scheduling on the instantaneous degrees of freedom of multiple interfering cellular networks. Particularly, we consider a homogeneous multiple cellular downlink scenario with multiple users per cell. We show that if the number of users in a cell scales faster than linearly with SNR, the instantaneous degrees of freedom with multiuser diversity increases and converges to L in both mean-square (m.s.) sense and almost sure (a.s.) sense for an L-cell downlink interference channel, even though very limited channel feedback is needed. Each user is equipped with L-1 antennas to capture the multidimensional out-of-cell interference from other base stations, while the base station has a single antenna. The user scheduling strategy that achieves L instantaneous degrees of freedom is to poll users experiencing only a small amount of out-of-cell interference. The instantaneous degrees of freedom with multiuser diversity and its convergence mode are compared to those of conventional interference alignment. Furthermore, the user scaling law is relaxed when ergodic throughout is analyzed.

Original languageEnglish
Title of host publicationConference Record of the 45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011
Pages1293-1297
Number of pages5
DOIs
Publication statusPublished - 2011
Event45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011 - Pacific Grove, CA, United States
Duration: 2011 Nov 62011 Nov 9

Publication series

NameConference Record - Asilomar Conference on Signals, Systems and Computers
ISSN (Print)1058-6393

Other

Other45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011
CountryUnited States
CityPacific Grove, CA
Period11/11/611/11/9

ASJC Scopus subject areas

  • Signal Processing
  • Computer Networks and Communications

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  • Cite this

    Kim, T., Love, D. J., & Clerckx, B. (2011). Instantaneous degrees of freedom of downlink interference channels with multiuser diversity. In Conference Record of the 45th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2011 (pp. 1293-1297). [6190225] (Conference Record - Asilomar Conference on Signals, Systems and Computers). https://doi.org/10.1109/ACSSC.2011.6190225