A novel underlay cognitive radio based on direct sequence complementary coded CDMA

Research output: Contribution to journalArticle

Abstract

In this study, we propose a spectrum sharing scheme where secondary-users (SUs) can co-exist at the same frequency band with the primary-users simultaneously. Both primary (PN) and secondary networks (SN) are considered as CDMA based networks with the same set of orthogonal complementary codes. An orthogonal complementary code set possesses both ideal auto-correlation function (ACF) of any code and ideal cross-correlation function for any two codes in the same set. In the proposed scheme, a delay is applied to the transmission of the SN which exploits ideal ACF properties of complementary codes and will not interfere the transmission of the primary user. Numerical results show that the proposed scheme enables SUs to efficiently utilize the PN's licensed spectrum without any harmful interference.

Original languageEnglish
Pages (from-to)559-567
Number of pages9
JournalWireless Personal Communications
Volume74
Issue number2
DOIs
Publication statusPublished - Jan 1 2014

Keywords

  • CDMA
  • Cognitive radio
  • Complementary codes

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering

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