Group sparse total least-squares for cognitive spectrum sensing

Emiliano Dall'Anese, Juan Andres Bazerque, Hao Zhu, Georgios B. Giannakis

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

2 Scopus citations

Abstract

The present paper develops a collaborative scheme whereby cognitive radios cooperate to localize active primary transmitters and reconstruct the power spectral density (PSD) maps (one per frequency band) portraying the power distribution across space. The sensing scheme relies on a parsimonious linear system model that accounts for the narrow-band nature of transmit-PSDs compared to the large swath of sensed frequencies, and for the group sparsity emerging when adopting a spatial grid of candidate primary user locations. Combining the merits of Lasso, group Lasso, and total least-squares (TLS), the proposed group sparse (GS) TLS approach yields hierarchically-sparse PSD estimates, and copes with model uncertainty induced by channel randomness and grid mismatch effects. Taking advantage of a novel low-complexity solver for the GS-Lasso, a block coordinate descent scheme is developed to solve the formulated GS-TLS problem. Simulations demonstrate the superior localization and PSD-estimation performance of GS-TLS compared to approaches that do not account for model uncertainties.

Original languageEnglish (US)
Title of host publication2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2011
Pages96-100
Number of pages5
DOIs
StatePublished - Sep 16 2011
Event2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2011 - San Francisco, CA, United States
Duration: Jun 26 2011Jun 29 2011

Publication series

NameIEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC

Other

Other2011 IEEE 12th International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2011
Country/TerritoryUnited States
CitySan Francisco, CA
Period6/26/116/29/11

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