Novel ACE Scheme for PAPR Reduction of High Broadband OFDM Systems

Abstract

The high broadband Orthogonal Frequency Division Multiplexing (OFDM) system is characterized by high-order constellation and a large of sub-carriers. In order to overcome the major drawback of high Peak-to-Average Power Ratio (PAPR) of OFDM signal, traditional Active Constellation Extension (ACE) techniques maybe pay more price, such as increasing the iteration numbers, thus, costing the more system resources. To address this challenge, a novel Pre-distortion ACE (PD-ACE) scheme is proposed in this paper. By defining a special expandable region for internal constellation and extending the original constellation points, PD-ACE can significantly reduce the PAPR level with only one iteration, thereby, not only increasing the convergence speed, but also decreasing the complexity of system implementation. Simulation results show that, at the expense of acceptable BER performance, the proposed scheme exhibits a better performance for PAPR reduction with low computation complexity compared with traditional methods.