Fundamental limits on time delay estimation in dispersed spectrum cognitive radio systems

Sinan Gezici, Hasari Celebi, H. Vincent Poor, Huseyin Arslan

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

In this paper, fundamental limits on time delay estimation are studied for cognitive radio systems, which facilitate opportunistic use of spectral resources. First, a generic Cramer-Rao lower bound (CRLB) expression is obtained in the case of unknown channel coefficients and carrier-frequency offsets (CFOs) for cognitive radio systems with dispersed spectrum utilization. Then, various modulation schemes are considered, and the effects of unknown channel coefficients and CFOs on the accuracy of time delay estimation are quantified. Finally, numerical studies are performed in order to verify the theoretical analysis.

Original languageEnglish (US)
Article number4786484
Pages (from-to)78-83
Number of pages6
JournalIEEE Transactions on Wireless Communications
Volume8
Issue number1
DOIs
StatePublished - Jan 2009

All Science Journal Classification (ASJC) codes

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

Keywords

  • Carrier frequency offset (CFO)
  • Cognitive radio
  • Cramer-Rao lower bound (CRLB)
  • Dispersed spectrum utilization
  • Time delay estimation

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