Directional Spectrum Sensing for Cognitive Radio Using ESPAR Arrays with a Single RF Chain

Rongrong Qian*, Mathini Sellathurai, Tharmalingam Ratnarajah

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)


In this paper, we propose to use the electronically steerable parasitic array radiator (ESPAR) antenna, which relies on a single radio frequency (RF) front end coupled with a number of parasitic elements to steer beams in prescribed directions in the angular domain on a time division basis, to identify the directional spectrum sensing opportunities for cognitive radios. In particular, we propose a two stage spectrum sensing: First ESPAR signal measurements from different directional beam-patterns are fed as input to the generalized likelihood ratio test (GLRT) algorithm to detect the existence of primary user signals. If signal existence is detected by the GLRT, then the directional measurements are used to obtain the direction of arrival (DoA) using a multiple signal classification (MUSIC) algorithm. We show that the DoA estimation performance using the ESPAR is comparable to that of the traditional uniform linear array when the signal-to-noise ratio (SNR) is larger than -15dB.

Original languageEnglish
Title of host publicationEuropean Conference on Networks and Communications (EuCNC), 2014
Number of pages5
ISBN (Print) 978-1-4799-5280-9
Publication statusPublished - 2014
Event23rd European Conference on Networks and Communications - Bologna, Italy
Duration: 23 Jun 201426 Jun 2014


Conference23rd European Conference on Networks and Communications
Abbreviated titleEuCNC’2014


  • Cognitive radio
  • spectrum sensing


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