Trellis Shaping for PAR Reduction in OFDM Systems

The application of trellis shaping was recently proposed to reduce the peak-to-average power ratio (PAR) of orthogonal frequency division multiplexing signals. In this paper, we review the trellis shaping schemes presented in the literature and we introduce modifications such as a new decoding metric and the use of sequential decoding, which improve PAR reduction and/or reduce complexity of trellis shaping. Based on implementation onisuggestions, we conduct a complexity and performance comparison for the different schemes. One interesting result of this work is that trellis shaping with time-domain metrics is superior to trellis shaping with frequency-domain metrics.