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In this letter, a low complexity joint peak to average power ratio (PAPR) reduction scheme is proposed for orthogonal frequency division multiplexing systems based on Luby transform (LT) codes. In the encoding process of LT codes, a predetermined threshold is introduced to control PAPR and reduce complexity. Moreover, we use the number of IFFT operations to model and formulate the theoretical algorithm complexity. Simulation results show that the proposed scheme can effectively reduce PAPR with a huge complexity reduction. Compared with the existing scheme, a maximum complexity reduction of 81% can be obtained concerning the total number of IFFT operations. Regarding the IFFT operations per degree, experimental curves are also consistent with the mathematical analysis.
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Bi et al. (2017) studied this question.
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