Algorithms (Jul 2009)

Improving the Competitive Ratio of the Online OVSF Code Assignment Problem

  • Shuichi Miyazaki,
  • Kazuya Okamoto

DOI
https://doi.org/10.3390/a2030953
Journal volume & issue
Vol. 2, no. 3
pp. 953 – 972

Abstract

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Online OVSF code assignment has an important application to wireless communications. Recently, this problem was formally modeled as an online problem, and performances of online algorithms have been analyzed by the competitive analysis. The previous best upper and lower bounds on the competitive ratio were 10 and 5/3, respectively. In this paper, we improve them to 7 and 2, respectively. We also show that our analysis for the upper bound is tight by giving an input sequence for which the competitive ratio of our algorithm is 7 ― ε for an arbitrary constant ε > 0.

Keywords