An LLR-based Cognitive Transmission Strategy for Higher Spectrum Reutilization
Paper in proceedings, 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 and Antenna Systems, Communication Systems

Erik Ström

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Erik Agrell

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

IEEE GLOBECOM 2011 - Cognitive Radio and Networks Symposium

6133865

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

Probability Theory and Statistics

DOI

10.1109/GLOCOM.2011.6133865

ISBN

9781424492688

More information

Latest update

3/29/2018