Spline-based spectrum cartography for cognitive radios

Gonzalo Mateos, Juan Andrés Bazerque, Georgios B. Giannakis

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

27 Scopus citations


A cooperative approach to the sensing task of wireless cognitive radio (CR) networks is introduced based on a spatial model of the power spectrum density (PSD). The model entails a basis expansion of the PSD in frequency, weighted by unknown spatial functions that are estimated from CR measurements. A novel model estimator is developed using a least-squares (LS) criterion regularized with a smoothing penalty. The estimator yields a finitely-parameterized two-dimensional surface spanned by thin-plate splines, which approximates the distribution of power in space. An online PSD tracker is also developed for slowly time-varying power spectra. Different from existing approaches to interference spectrum cartography, the novel sensing scheme neither requires knowledge of second-order spatial statistics, nor it relies on stationarity assumptions.

Original languageEnglish (US)
Title of host publicationConference Record - 43rd Asilomar Conference on Signals, Systems and Computers
Number of pages5
StatePublished - Dec 1 2009
Event43rd Asilomar Conference on Signals, Systems and Computers - Pacific Grove, CA, United States
Duration: Nov 1 2009Nov 4 2009

Publication series

NameConference Record - Asilomar Conference on Signals, Systems and Computers
ISSN (Print)1058-6393


Other43rd Asilomar Conference on Signals, Systems and Computers
Country/TerritoryUnited States
CityPacific Grove, CA


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