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In Tone Reservation (TR) based OFDM systems, the Peak to Average Power Ratio (PAPR) reduction performance mainly depends on the selection of the Peak Reduction Tone (PRT) set and the optimal target clipping level. Finding the optimal PRT set requires an exhaustive search of all combinations of possible PRT sets, which is a Non-Deterministic polynomial-time (NP-hard) problem, and this search is infeasible for the number of tones used in practical systems. The existing selection methods, such as the consecutive PRT set, equally spaced PRT set and random PRT set, perform poorly compared to the optimal PRT set or incur high computational complexity.
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