Energy-efficient cooperative spectrum sensing schemes for cognitive radio networks

Nan Zhao, Fei Richard Yu*, Hongjian Sun, Arumugam Nallanathan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

Rapidly rising energy costs and increasingly rigid environmental standards have led to an emerging trend of addressing "energy efficiency" aspect of wireless communication technologies. Cognitive radio can play an important role in improving energy efficiency in wireless networks, because from the green perspective, spectrum is a natural resource which should not be wasted but be shared. In this article, we propose two energy-efficient and time-saving one-bit cooperative spectrum sensing schemes, which have two stages in the spectrum sensing process. If the signal-to-noise ratio is high or no primary user exists, only one stage of coarse spectrum sensing is needed, by which the sensing time and energy are saved. Otherwise, the second stage of fine spectrum sensing will be performed to increase the spectrum sensing accuracy. Furthermore, only one-bit decision is sent by each secondary user to minimize the overhead. The second proposed algorithm fully utilizes the local decisions of the coarse detection, and its energy consumption is further reduced with its sensing performance close to the first one. Plenty of simulation is performed, and the results show that the sensing time and energy consumption are both reduced significantly in the proposed schemes.

Original languageEnglish
Article number120
Number of pages13
JournalEurasip Journal On Wireless Communications And Networking
Volume2013
DOIs
Publication statusPublished - 3 May 2013

Keywords

  • Cognitive radio
  • Cooperative spectrum sensing
  • Energy efficiency
  • WIRELESS COMMUNICATIONS
  • OPTIMIZATION
  • SIGNALS
  • ISSUES

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