A new trellis shaping design for OFDM

A novel peak-to-average power reduction method based on trellis shaping is proposed for OFDM systems. The trellis shaping decoder is designed to control the transmitted data sequence based on minimization of the autocorrelation sidelobe components. The branch metric of the decoder is devised such that the Viterbi algorithm is applicable. The overall performance depends considerably on the type of signal mapping, and as an example, two types of mapping, referred to as the type-I and type-II, are proposed. While the former achieves significant peak-to-average power reduction without any average power reduction capability, the latter can also reduce the average power similarly to the original trellis shaping. The bit-error probability of the system over an AWGN channel is evaluated by simulation, confirming the effectiveness of the proposed scheme.