Achievable degrees of freedom for interference broadcast channels with asymmetric complex signaling

Hun Young Shin, Seok Hwan Park, Haewook Park, Inkyu Lee

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

2 Citations (Scopus)

Abstract

In multi-cell environments, interference alignment (IA) introduced by Cadambe and Jafar is an effective strategy for managing interference. However, this requires a large number of symbol extension in time/frequency domain to gurantee the optimal number of degrees of freedom (DOF). Recently, in the single-input single-output (SISO) case, a new idea of the IA scheme based on asymmetric complex signaling and symbol extension was proposed where at least the DOF of 1.2 is achievable for all complex channel values. In this paper, we prove that at least the DOF of 1.5 is achievable in multi-cell and multi-user interfering broadcast channels under the assumption of constant channel coefficients with no symbol extension. We also show that the achievable DOF varies with the condition of user scale and ω (√SNR) users are required to guarantee the DOF of 1.5. Furthermore, a simple IA scheme in conjunction with user selection which groups semi-aligned users is proposed to realize the achievable DOF.

Original languageEnglish
Title of host publication2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Proceedings
DOIs
Publication statusPublished - 2011
Event2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Budapest, Hungary
Duration: 2011 May 152011 May 18

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252

Other

Other2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring
CountryHungary
CityBudapest
Period11/5/1511/5/18

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

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