Downlink scheduling and resource allocation for OFDM systems

Jianwei Huang*, Vijay G. Subramanian, Rajeev Agrawal, Randall A. Berry

*Corresponding author for this work

Research output: Contribution to journalArticle

195 Scopus citations

Abstract

We consider scheduling and resource allocation for the downlink of a cellular OFDM system, with various practical considerations including integer tone allocations, different sub-channelization schemes, maximum SNR constraint per tone, and self-noise#x201D; due to channel estimation errors and phase noise. During each time-slot a subset of users must be scheduled, and the available tones and transmission power must be allocated among them. Employing a gradient-based scheduling scheme presented in earlier papers reduces this to an optimization problem to be solved in each time-slot. Using a dual formulation, we give an optimal algorithm for this problem when multiple users can time-share each tone. We then give several low complexity heuristics that enforce integer tone allocations. Simulations are used to compare the performance of different algorithms.

Original languageEnglish (US)
Article number4786509
Pages (from-to)288-296
Number of pages9
JournalIEEE Transactions on Wireless Communications
Volume8
Issue number1
DOIs
StatePublished - Jan 1 2009

Keywords

  • Cellular downlink
  • Nonlinear optimization
  • Orthogonal frequency division multiplexing (OFDM)
  • Resource allocation
  • Scheduling
  • WiMax
  • Wireless communications

ASJC Scopus subject areas

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

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