Improved Tone Reservation PAPR Reduction Algorithm in NC-OFDM/OQAM System

摘要

Non-continuous orthogonal frequency division multiplexing with offset quadrature amplitude modulation (NC-OFDM/OQAM) is often referred to overcome the issues associated with spectrum distribution. The corresponding peak to average power ratio (PAPR) emerged as a difficult task for the hardware implementation which seriously restricts the practicability of NC-OFDM/OQAM. To solve this problem, an improved PAPR reduction algorithm based on the tone reservation technique is proposed. According to the results of spectrum sensing, the bands are divided into two categories based on whether or not there are primary users (PU). Secondary users (SU) choose different sub-carrier numbers and amplitudes of the reserved sub-carriers in those bands separately. There by, SU get a substantial PAPR reduction while avoiding the interference to the PU and increasing the spectrum utilization efficiency. Theoretical analysis and simulation results show that the proposed algorithm supports a good PAPR reduction performance and efficient use of spectrum as well.