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针对光正交频分复用(OFDM)系统中峰值平均功率比(PAPR)较高的缺点,重点研究了基于部分序列传输法(PTS)的峰均比抑制技术,提出一种改进的加强迭代PTS搜索技术(EIA-PTS),该技术能够降低原PTS的计算复杂度。仿真表明:原PTS方法随着相应参数的增加,迭代次数呈指数型增长,而EIA-PTS技术的迭代次数基本保持平稳且低于原PTS方法。在此基础上,又将EIA-PTS与削波(Clipping)技术相结合,提出了峰均比EIA-PTS-Clipping联合抑制技术。与EIA-PTS技术相比,该技术进一步提升了系统PAPR的抑制性能,能在系统误码率(BER)性能与PAPR抑制效果之间取得更好的折衷,具有较高的利用价值。
Aiming at the shortcoming of high Peak-to-Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) system, the peak-to-average ratio suppression technique based on partial sequence transmission (PTS) PTS search technology (EIA-PTS), the technology can reduce the computational complexity of the original PTS. The simulation results show that the original PTS method increases exponentially with the increase of corresponding parameters, while the number of iterations of EIA-PTS technique remains stable and is lower than the original PTS method. On this basis, the combination of EIA-PTS and Clipping technology is proposed, and the peak-to-average ratio EIA-PTS-Clipping combination suppression technology is proposed. Compared with the EIA-PTS technology, this technology further enhances the system PAPR rejection performance, and achieves a better compromise between the system BER performance and the PAPR rejection efficiency.