Two-user opportunistic scheduling using hierarchical modulations in wireless networks with heterogenous average link gains

Md Jahangir Hossain, Mohamed Slim Alouini, Vijay K. Bhargava

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

5 Scopus citations

Abstract

Our contribution, in this paper, is two-fold. First, we analyze performance of a hierarchical modulation-assisted two-best user opportunistic scheduling (TBS) scheme, which was proposed by the authors in [1], in a fading environment where different users have different average link gains. Specifically, we present expression for the spectral efficiency (SE) of the users and using this expression, we compare degrees of fairness (DOF) of the TBS with that of classical single user opportunistic scheduling schemes. Second contribution is that we propose a new hybrid two-user opportunistic scheduling (HTS) scheme based on the TBS scheme. This HTS selects the first user based on the largest absolute carrier-to-noise (CNR) value among all the users while the second user is selected according to the ratios of the absolute CNRs to the corresponding average CNRs of the remaining users. Numerical results are presented for a fading environment where different users experience independent but non-identical (i.n.d) channel fading. These selected numerical results show that the proposed HTS scheme can considerably increase the system's fairness without any degradation of the link SE compared to the classical single best user scheduling. These results also show that the proposed HTS has a lower fairness in comparison to the proportional fair scheduling (PFS) which suffers from a considerable degradation in link SE.

Original languageEnglish (US)
Title of host publicationICC 2008 - IEEE International Conference on Communications, Proceedings
Pages1098-1102
Number of pages5
DOIs
StatePublished - 2008
Externally publishedYes
EventIEEE International Conference on Communications, ICC 2008 - Beijing, China
Duration: May 19 2008May 23 2008

Other

OtherIEEE International Conference on Communications, ICC 2008
CountryChina
CityBeijing
Period05/19/0805/23/08

Keywords

  • Adaptive modulations
  • Degrees of fairness
  • Hierarchical constellations
  • Multi-user diversity
  • Opportunistic scheduling
  • Spectral efficiency

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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