Space-time metrics for spectrum sensing

Rahul Tandra, Anant Sahai, Venugopal V. Veeravalli

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

Abstract

Cognitive radio systems must robustly sense spectrum holes if they want to use spectrum opportunistically. A traditional sensitivity-based time-domain perspective on this is relatively straightforward and such sensitivity based sensors are easy to certify. However, the problem is more subtle than it first appears. To really understand the question of what should be the right level of sensitivity for a sensor?, especially for multi-user sensing algorithms, one is forced to think more deeply about the spatial dimension of sensing and the role of fading. In this paper we propose a framework to model the joint space-time dimension of spectrum sensing. This framework naturally gives us reasonable approximate metrics that capture the two desirable features of a spectrum sensor: safety to primary users and performance for the cognitive radios. It is the tradeoff between these two that is fundamental. Furthermore, this framework helps us to quantify the tradeoff between space and time. The single-radio energy detector is used to illustrate the tension between the performance in time and the performance in space for a fixed value of protection to the primary user.

Original languageEnglish (US)
Title of host publication2010 IEEE Symposium on New Frontiers in Dynamic Spectrum, DySPAN 2010
DOIs
StatePublished - 2010
Event2010 IEEE Symposium on New Frontiers in Dynamic Spectrum, DySPAN 2010 - Singapore, Singapore
Duration: Apr 6 2010Apr 9 2010

Publication series

Name2010 IEEE Symposium on New Frontiers in Dynamic Spectrum, DySPAN 2010

Other

Other2010 IEEE Symposium on New Frontiers in Dynamic Spectrum, DySPAN 2010
Country/TerritorySingapore
CitySingapore
Period4/6/104/9/10

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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