1. Channel Sensing for Cognitive Radio
James Xu, Fakhrul Alam (Supervisor)
What is Channel Sensing?
What is Cognitive Radio
A set of techniques that allows a Cognitive Radio to sense which communication channels are free
A communication system which has traditional hardware replaced by software
Software parts offer flexibility
Channel Sensing Techniques
Energy detection
Why do we need Cognitive Radio
Over 90% of the communication channels have been allocated to licensed users
License rate is high, but utilization rate is low.
Cyclostationary feature extraction
Cognitive Radio allows us to use the “holes” in licensed space that are currently unused
Research Equipment
National Instruments PXI-5661 Vector signal analyzer
LabVIEW 8.6
Agilent 33120A signal generator
USRP (Universal Software Radio Peripheral) FPGA
HP Oscilloscope
Simple Demo – FM Receiver in LabVIEW
Real time Adaptive Energy Detection in LabVIEW