An LLR-based Cognitive Transmission Strategy for Higher Spectrum Reutilization
Paper in proceeding, 2011
Reutilization of the spectrum licensed to services with low occupancy is of great interest for cognitive radios (CRs). To achieve this goal, we introduce a simple hidden Markov model which captures the primary users activity, signal uncertainties, and noise. For evaluating the performance of any CR, two new criteria are presented entitled spectrum utilization ratio (UR) and interference ratio (IR). Based on this model and new measures, a new a-posterior log-likelihood-ratio based CR is designed and implemented. Its performance is compared with standard energy-detection based spectrum-sensing CR. We demonstrate more than 300% increase in UR for up to 1% allowed interference at the SNR of -5dB.
Cognitive radio
hidden Markov model
interference ratio
spectrum utilization
spectrum sensing
Author
Kasra Haghighi
Chalmers, Signals and Systems, Communication, Antennas and Optical Networks
Erik Ström
Chalmers, Signals and Systems, Communication, Antennas and Optical Networks
Erik Agrell
Chalmers, Signals and Systems, Communication, Antennas and Optical Networks
IEEE GLOBECOM 2011 - Cognitive Radio and Networks Symposium
6133865
9781424492688 (ISBN)
Areas of Advance
Information and Communication Technology
Subject Categories (SSIF 2011)
Telecommunications
Probability Theory and Statistics
DOI
10.1109/GLOCOM.2011.6133865
ISBN
9781424492688