Degrees of freedom and sum rate maximization for two mutually interfering broadcast channels

Seok Hwan Park, Lee Inkyu

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

20 Citations (Scopus)

Abstract

In this paper, we derive a precise expression of spatial degrees of freedom (DOF) for two mutually interfering broadcast channels (IFBC) as a function of arbitrary numbers of transmit antennas and users. The lower bound on the DOF is obtained by showing that the zero-forcing solution suffices to achieve all the DOF. Also, the upper bound which coincides with the lower bound is shown using Jafar's earlier work. From the derived result, we observe that disabling receive cooperation of the MIMO interference channel causes the DOF loss. Additionally, we propose a linear precoding scheme for the IFBC by extending one designed for broadcast channels with an aim of maximizing the sum rate performance. We utilize the fact that the precoding matrices in stationary point always satisfy the zero-gradient condition. Our result is confirmed through numerical simulations on the sum rate performance of the proposed precoding technique.

Original languageEnglish
Title of host publicationProceedings - 2009 IEEE International Conference on Communications, ICC 2009
DOIs
Publication statusPublished - 2009 Nov 19
Event2009 IEEE International Conference on Communications, ICC 2009 - Dresden, Germany
Duration: 2009 Jun 142009 Jun 18

Publication series

NameIEEE International Conference on Communications
ISSN (Print)0536-1486

Other

Other2009 IEEE International Conference on Communications, ICC 2009
CountryGermany
CityDresden
Period09/6/1409/6/18

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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  • Cite this

    Park, S. H., & Inkyu, L. (2009). Degrees of freedom and sum rate maximization for two mutually interfering broadcast channels. In Proceedings - 2009 IEEE International Conference on Communications, ICC 2009 [5198887] (IEEE International Conference on Communications). https://doi.org/10.1109/ICC.2009.5198887