Abstract: This study examines PAPR (Peak-to-Average Power Ratio) reduction using TR (Tone Reservation) for NC-OQAM/OFDM (Non-Contiguous Offset Quadrature Amplitude Modulation based Orthogonal Frequency Division Multiplexing) transmissions which are used in DSA (Dynamic Spectrum Access) networks such as CR (Cognitive Radio). In the TR method, scaling of time-domain peak reduction kernel signal affects only reserved tones in a given frequency domain according to Fourier transform principles. Since, it does not interfere with PUs (Primary Users), it can be an optimal approach in CR network environment. In this study, a method was considered to reduce PAPR for NC-OQAM/OFDM based CR system by reserving some tones among tones available to SU (Secondary User) for NC-OQAM/OFDM based CR systems.