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中文摘要：
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。
英文摘要：
The research has focused on improving the peak-to-average-power-ratio（PAPR）reduction technology based on the partial transmission sequences（PTS）method in terms of the defect of the high PAPR for optical orthogonal frequency division multiplexing（OFDM）systems.Furthermore,an improved enhanced-iterative-algorithm-PTS（EIA-PTS）technology is presented,and the presented EIA-PTS technology,compared with the original PTS（O-PTS）,can reduce the computational complexity.The simulation results show that the computational complexity of the O-PTS method grows exponentially with the increase of the number of both the subblocks and the phase factors while the computational complexity of the EIA-PTS technology basically keeps stable and is lower than that of the O-PTS method.A new improved EIA-PTS-Clipping combined PAPR reduction technology that combines the EIA-PTS technology with the clipping technology,based on the presented EIA-PTS technology,is proposed.The simulation analysis shows the proposed EIA-PTS-Clipping combined PAPR reduction technology,compared with the previous proposed EIA-PTS technology, can further improve the PAPR reduction performance and has a higher application value because it can have a better tradeoff between the bit error rate（BER）performance and the PAPR reduction effect for optical OFDM systems.
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