An Improved PAPR Suppression Algorithm based on Channel Coding in OFDM System

A specific LDPC check matrix structure is used to form multi-channel alternative signal to solve the problem that traditional block codes inhibiting PAPR scheme is not suitable for a large number of sub-carriers and LDPC code is applied to the field of optimization of peak-to-average ratio. A rapid construction method of LDPC check matrix and fast encoding process using matrix are analyzed in detail. Simulation results show that performance of LDPC code is better than Turbo code on the PAPR suppression. In addition, quasi-cyclic LDPC code has a slight advantage on PAPR reduction compared with quasi-cyclic LDPC code, but the proposed method has lower computational complexity.