Selection Scheme of the Optimal Tone Set in TR Method

In tone reservation (TR) scheme, it is known that the randomly generated set of peak reduction tones (PRT’s) performs better than the contiguous PRT set and interleaved PRT set in the PAPR reduction of orthogonal frequency division multiplexing (OFDM). It is known that finding the optimal PRT set corresponds to the secondary peak minimization problem in TR scheme. But, the problem is NP-hard because it must be optimized over all possible discrete sets. Thus, it cannot be solved for practical values of N . In this paper, a new search algorithm for the optimal PRT set is proposed based on the fact that the minimization problem of the secondary peak can be related with the minimization of the variance. From the simulation results, it is shown that the PRT set obtained by the proposed algorithm has the best PAPR reduction performance for OFDM signals.