In this paper, a peak to average power ratio (PAPR) reduction scheme with low complexity and high performance for orthogonal frequency division multiplexing (OFDM) signals is proposed. The proposed scheme is a hybrid PAPR scheme that employs a two-stage cascade structure. The first stage is a post-IFFT stage that can construct a set of high-order quadrature amplitude modulation (QAM) sequences from QPSK or BPSK sequences with the smallest possible number of IFFTs. The second stage is based on an optimal Class-III selected mapping (SLM) scheme which consists of a bank of parallel blocks. Each of these blocks generates more candidate sequences from each of QAM sequences by passing it through a set of parallel sub-blocks that perform circular convolution with perfect sequences and circular shifting with optimum shift values. Simulation results show that the proposed scheme can outperform existing schemes in terms of PAPR reduction with lower complexity.

中文翻译：

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使用完美序列的 OFDM 系统混合 PAPR 降低方案

本文提出了一种低复杂度、高性能的正交频分复用(OFDM)信号峰均功率比(PAPR)降低方案。所提出的方案是采用两级级联结构的混合PAPR方案。第一阶段是后 IFFT 阶段，它可以从 QPSK 或 BPSK 序列中构造一组高阶正交幅度调制 (QAM) 序列，其中 IFFT 的数量可能最少。第二阶段基于最佳的 III 类选择映射 (SLM) 方案，该方案由一组并行块组成。这些块中的每一个都通过一组并行子块从每个 QAM 序列生成更多候选序列，这些子块执行具有完美序列的循环卷积和具有最佳移位值的循环移位。