In cognitive radio networks, the identification of a primary user (PU) with the help of spectrum sensing is very important for a secondary user (SU), such that interference free transmission can be performed. In recent times, the cooperative spectrum sensing that improves the reliability of the decisions made about the... [Read More]

Time-division-multiple-access-based cognitive radio networks allow each licensed primary user to transmit its packets exclusively. The available idle slots present an opportunity to the unlicensed secondary users (SUs) to access the licensed channel for their own transmission. The different SUs contending to access the channel during idle time slot may result... [Read More]