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PRACTICAL IMPLEMENTATION OF A COGNITIVE RADIO SYST
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Cognitive radio for dynamic spectrum access enables opportunistic use of the radio-frequency (RF) spectrum, allowing unlicensed users to utilize licensed bands under the condition that they interfere as little as possible with the licensees. A cognitive radio transmits on bands detected as being free, leaving them whenever a primary user is sensed. This work focuses on the practical implementation of a cognitive radio for dynamic spectrum access. A power detector is chosen to sense the spectrum. The Receiver Operating Characteristic (ROC) of the detector is obtained experimentally. After sensing, the cognitive radio will transmit on one of the free channels. Detection and transmission are implemented in parallel at the cognitive transmitter. There is a tradeoff between transmission rate of the cognitive radio and interference created to the licensed user. This thesis also presents the implementation of a cognitive receiver, the counterpart t
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