PAPR Reduction Schemes for Lifting Scheme based Orthogonal Wavelet Packet Multiplexing System

Abstract

Lifting scheme based orthogonal wavelet packet multiplexing (LOWPM) system can increase computation ef- ficiency and save storage space, but as a new multicarrier modulation system, it also has the problem of high peak to aver- age power ratio (PAPR). In order to reduce computational complexity and improve the effect of PAPR suppression for Partial Transmit Sequence (PTS) technology, PAPR reduction schemes based on the technology of pruning wavelet packet modulation and the improved threshold search for PTS are put forward in the paper, through proper pruning of the full-tree structure of wavelet packet modulation in the PTS to reduce the number of nodes in the system, and finally im- prove the effect of PAPR reduction, on the other hand through improving threshold search to increase processing effi- cience. Simulation results show that the proposed algorithm compared with the original algorithm has corresponding per- formance improvement, and on the condition that not to affect the original bit error rate of system, can better reduce PAPR, while decrease the computational complexity.