Cognitive Radio Networks: Spectrum Management
According to Federal Communication Commission (FCC), more than 70% of spectrum is not properly utilised.
Cognitive radio is the efficient technique which is used to utilise the radio frequency spectrum. Using this technique both the
licensed and unlicensed user can utilise the radio spectrum. Licensed user are primary users or legitimate users while the
unlicensed one are secondary users .Using Spectrum sharing technique primary user allocates the radio spectrum to
secondary user without degrading its own performance.
Keywords - Cognitive radio, Primary user, Secondary user, Licensed user