Home > Research > Publications & Outputs > Spectrum sharing in DS-CDMA/OFDM wireless mobil...
View graph of relations

Spectrum sharing in DS-CDMA/OFDM wireless mobile networks

Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSNChapter (peer-reviewed)

Published
  • Keivan Navaie
  • Halim Yanikomeroglu
  • Mohammad G. Khoshkholgh
  • Ahmad R. Sharafat
  • Hamidreza Nikoofar
Close
Publication date2011
Host publicationCognitive radio mobile ad hoc networks
EditorsF. Richard Yu
Place of PublicationNew York
PublisherSpringer
Pages91-125
Number of pages35
ISBN (Electronic)9781441961723
ISBN (Print)9781441961716
Original languageEnglish

Abstract

In this chapter, we define DS-CDMA/OFDM spectrum sharing systems and investigate the impact of the primary service communication activity as well as other system parameters on the interference level at the secondary service receiver. The achieved capacity of the secondary service is directly related to the interference level at the secondary service receiver as well as the secondary service adopted sub-channel selection policy. The achievable capacity of the secondary service in such systems is obtained under different sub-channel selection policies in fading environments. Two general sub-channel selection policies are studied in this chapter: uniform sub-channel selection and non-uniform sub-channel selection. Uniform sub-channel selection fits into the cases where a priori knowledge on sub-channels state information is not available at the secondary transmitter. For cases with available a priori knowledge on sub-channels state information, a variety of non-uniform sub-channel selection policies are studied. We then present results on the scaling law of the opportunistic spectrum sharing in DS-CDMA/OFDM systems with multiple users. We provide numerical results to compare different sub-channel selection policies.