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高的峰值平均功率比(Peak-to-Average Power Ratio,PAPR)是光正交频分复用(Optical Orthogonal Frequency Division Multiplexing,O-OFDM)系统的一个主要缺点,选择性映射(Selective Mapping,SLM)法能有效降低高PAPR出现的概率,但它的计算复杂度较高。一些低复杂度的SLM方案能够有效地降低复杂度,但同时也降低了PAPR的抑制性能。为了平衡这两个因素,将低复杂度SLM方案与次优选择的思想相结合,文章提出了一种联合改进的PAPR抑制方案。在低复杂度方案中,通过将一个复频域信号分为两个实信号,再利用快速傅里叶变换(Fast Fourier Transform,FFT)的平移和反折性质将其重建成新的信号,以得到更多的备选信号,如此便能降低计算复杂度。然后,再结合次优选择的思想,选择PAPR最小的一路以得到最优的PAPR抑制性能。仿真结果验证了该方案的有效性。
The high peak-to-average power ratio (PAPR) is a major disadvantage of O Orthogonal Frequency Division Multiplexing (O-OFDM) systems. Selective Mapping (SLM) ) Method can effectively reduce the probability of high PAPR, but its computational complexity is high. Some SLM schemes with low complexity can effectively reduce the complexity, but also reduce PAPR suppression performance. In order to balance these two factors, the low complexity SLM scheme is combined with the idea of suboptimal choice. In this paper, we propose a joint improved PAPR suppression scheme. In the low-complexity scheme, a complex frequency domain signal is divided into two real signals and reconstructed into new signals by using the translation and refraction properties of Fast Fourier Transform (FFT) Get more alternative signals, so you can reduce the computational complexity. Then, combined with the idea of suboptimal selection, we choose the path with the smallest PAPR to get the optimal PAPR rejection performance. Simulation results verify the effectiveness of this scheme.