Another application for trellis shaping: PAR reduction for DMT (OFDM)

A bound for the possible reduction of the peak-to-average ratio (PAR) dependent on the rate as well as possible practical procedures are presented. The idea of trellis shaping, originally used to minimize average transmit power in single-carrier systems, is applied to the problem of PAR reduction in multicarrier transmission. Its impact, as a function of code rate, as well as design practicability is considered using metrics in both the time and frequency domains.