A feasibility study on opportunistic interference alignment: Limited feedback and sum-rate enhancement

Hyun Jong Yang, Won Yong Shin, Bang Chul Jung, Arogyaswami Paulraj

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

4 Citations (Scopus)

Abstract

In this paper, we illuminate opportunistic interference alignment (OIA) for multi-input multi-output (MIMO) interfering multiple-access channels (IMACs) by tackling the following two practical challenges: i) feedback overhead due to scheduling metrics sent by users and ii) sub-optimality in terms of sum-rate derived from the conventional OIA. To reduce the feedback overhead, we first propose an opportunistic feedback strategy based on interference leakage, which guarantees the total generating interference to other-cell base stations to be smaller than a predefined threshold. In addition, we also consider the channel gain of the desired link for improving the achievable sum-rate for uplink, while the conventional OIA only uses the generating interference to other cells as a scheduling metric. Simulation results show that the effective sum-rate of the proposed technique is significantly higher than that of conventional scheduling methods, including the conventional OIA, for all signal-to-noise ratio (SNR) regimes. The effective sum-rate is obtained by considering the effect of feedback overhead on the total throughput of the MIMO IMAC model.

Original languageEnglish
Title of host publicationConference Record of the 46th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2012
Pages1132-1136
Number of pages5
DOIs
Publication statusPublished - 2012 Dec 1
Event46th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2012 - Pacific Grove, CA, United States
Duration: 2012 Nov 42012 Nov 7

Publication series

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

Conference

Conference46th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2012
CountryUnited States
CityPacific Grove, CA
Period12/11/412/11/7

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Computer Networks and Communications

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    Yang, H. J., Shin, W. Y., Jung, B. C., & Paulraj, A. (2012). A feasibility study on opportunistic interference alignment: Limited feedback and sum-rate enhancement. In Conference Record of the 46th Asilomar Conference on Signals, Systems and Computers, ASILOMAR 2012 (pp. 1132-1136). [6489197] (Conference Record - Asilomar Conference on Signals, Systems and Computers). https://doi.org/10.1109/ACSSC.2012.6489197