Spectrum sensing for cognitive radio: State-of-the-art and recent advances

Erik Axell, Geert Leus, Erik G. Larsson, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

949 Scopus citations


The ever-increasing demand for higher data rates in wireless communications in the face of limited or underutilized spectral resources has motivated the introduction of cognitive radio. Traditionally, licensed spectrum is allocated over relatively long time periods and is intended to be used only by licensees. Various measurements of spectrum utilization have shown substantial unused resources in frequency, time, and space [1], [2]. The concept behind cognitive radio is to exploit these underutilized spectral resources by reusing unused spectrum in an opportunistic manner [3], [4]. The phrase cognitive radio is usually attributed to Mitola [4], but the idea of using learning and sensing machines to probe the radio spectrum was envisioned several decades earlier (cf., [5]).

Original languageEnglish (US)
Article number6179814
Pages (from-to)8-10
Number of pages3
JournalIEEE Signal Processing Magazine
Issue number3
StatePublished - May 2012

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Electrical and Electronic Engineering
  • Applied Mathematics


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