Spectral Efficiency of Schedulers in Non-identical Composite Links with Interference

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


Accurate system planning and performance evaluation
requires knowledge of the joint impact of scheduling,
interference, and fading. However, current analyses either require costly numerical simulations or make simplifying assumptions that limit the applicability of the results. In this paper, we derive analytical expressions for the spectral efficiency of cellular
systems that use either the channel-unaware but fair round robin scheduler or the greedy, channel-aware but unfair maximum signal to interference ratio scheduler. As is the case in real deployments, non-identical co-channel interference at each user, both Rayleigh fading and lognormal shadowing, and limited modulation constellation sizes are accounted for in the analysis.
We show that using a simple moment generating function-based lognormal approximation technique and an accurate Gaussian-Q function approximation leads to results that match simulations well. These results are more accurate than erstwhile results that instead used the moment-matching Fenton-Wilkinson approximation method and bounds on the Q function. The spectral efficiency of cellular systems is strongly influenced by the channel
scheduler and the small constellation size that is typically used in third generation cellular systems.


  • J Wu
  • N B Mehta
  • Andreas Molisch
  • J Zhang
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering
Original languageEnglish
Title of host publicationIEEE International Conference on Communications, ICC '07.
Number of pages6
Publication statusPublished - 2007
Publication categoryResearch
EventIEEE ICC 2007 - Glasgow, Scotland
Duration: 2007 Jun 242007 Jun 28


ConferenceIEEE ICC 2007