Multiple-Candidate Separation for PTS-Based OFDM Systems by Turbo Decoding

Partial transmit sequence (PTS) is a well-known peak-to-average power ratio (PAPR) reduction scheme based on the concept of multiple candidates. In this paper, we propose multiple-candidate separation at the receiver by turbo decoding. Both blind and semi-blind methods are proposed and applied to both the phase-rotation-based PTS scheme and cyclical-shift-based PTS scheme. The blind method in general achieves better error performance at the cost of higher complexity compared to the semi-blind method. Compared to the conventional method, both methods can provide better error performance. The proposed blind method can achieve similar error performance compared to using the perfect side information.