Improved Interference-Free Channel Allocation in Coordinated Multiuser Multiantenna Open-Access Small Cells

Redha M. Radaydeh, Ammar Zafar, Fawaz S. Al-Qahtani, Mohamed Slim Alouini

Research output: Contribution to journalArticle

3 Citations (Scopus)


This paper investigates low-complexity joint interference avoidance and desired link improvement for single-channel allocation in multiuser multiantenna access points (APs) for open-access small cells. It is considered that an active user is equipped with an antenna array that can be used to suppress interference sources but not to provide spatial diversity. On the other hand, the operation of APs can be coordinated to meet design requirements, where each of which can unconditionally utilize assigned physical channels. Moreover, each AP is equipped with uncorrelated antennas that can be reused simultaneously to serve many active users. The analysis provides new approaches to exploit physical channels, transmit antennas, and APs to mitigate interference, while providing the best possible link gain to an active user through the most suitable interference-free channel. The event of concurrent service requests placed by active users on a specific interference-free channel is discussed for either interference avoidance through identifying unshared channels or desired link improvement via multiuser scheduling. The applicability of the approaches to balance downlink loads is explained, and practical scenarios due to imperfect identification of interference-free channels and/or the scheduled user are thoroughly investigated. The developed results are applicable for any statistical and geometric models of the allocated channel to an active user, as well as channel conditions of interference users. They can be used to study various performance measures. Numerical and simulation results are presented to explain some outcomes of this paper.

Original languageEnglish
Article number7407649
Pages (from-to)9994-10010
Number of pages17
JournalIEEE Transactions on Vehicular Technology
Issue number12
Publication statusPublished - 1 Dec 2016



  • Antenna array steering
  • coordinated transmission
  • desired link improvement
  • interference avoidance
  • interference-free channel identification
  • load balancing
  • multiuser scheduling
  • multiuser systems
  • open-access cells
  • reconfigurable antenna systems
  • resource allocation
  • small cells
  • statisticalmodeling

ASJC Scopus subject areas

  • Automotive Engineering
  • Aerospace Engineering
  • Computer Networks and Communications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this