A sign selection method of orthogonal variable spreading factor code for peak power reduction in multi-rate OFCDM systems

Osamu Takyu, Tomoaki Ohtsuki, Masao Nakagawa

Research output: Contribution to journalArticle

1 Citation (Scopus)


In this paper, we propose a novel peak-to-average power ratio (PAPR) reduction method for multi-rate orthogonal frequency division multiplexing (OFCDM) based on an orthogonal variable spreading factor (OVSF) code. In the method, the base station assigns two signs of code sequence to each user to maintain the orthogonality among the code sequences that have different lengths. After that, one sign of the code sequence is selected for reducing the PAPR of the OFCDM symbol. Based on theoretical analysis and computer simulation, we show that the proposed method reduces the PAPR for two data rate classes.

Original languageEnglish
Pages (from-to)1333-1345
Number of pages13
JournalIEICE Transactions on Communications
Issue number4
Publication statusPublished - 2006 Apr



  • Multi-rate communication
  • OVSF code
  • Peak power problem

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this