电信科学 ›› 2011, Vol. 27 ›› Issue (4): 68-72.doi: 10.3969/j.issn.1000-0801.2011.04.019

• 研究与开发 • 上一篇    下一篇

FRFT与PTS联合降低OFDM系统峰均功率比的方法

申勇,达新宇,曾武,谢铁城   

  1. 空军工程大学电讯工程学院 西安 710077
  • 出版日期:2011-04-15 发布日期:2011-04-15
  • 基金资助:
    国家自然科学基金资助项目;陕西省自然科学基金资助项目

A Union Algorithm of FRFT and PTS to Reduce PAPR in OFDM System

Yong Shen,Xinyu Da,Wu Zeng,Tiecheng Xie   

  1. Telecommunication Engineering Institute,Air Force Engineering University,Xi’an 710077,China
  • Online:2011-04-15 Published:2011-04-15

摘要:

针对OFDM系统的高PAPR,提出了将FRFT与PTS相结合的方法解决这一问题。首先利用FRFT代替FFT,使得系统的PAPR在适当的阶次下有了一定的下降。为更加有效地降低系统PAPR,将FRFT与PTS法相结合应用到OFDM中,并根据FRFT的酉性,简化了最优阶次的搜索算法,寻找出当系统阶次为0.006时其PAPR性能达到最优。仿真结果表明,当CCDF=10-4时,最优阶次下的OFDM系统将其PAPR降低了约7 dB,比使用传统PTS法时降低了约4 dB。

关键词: 正交频分复用, 分数阶傅里叶变换, 峰值平均功率比, 部分传输序列

Abstract:

Concerning that the main drawback of OFDM system is high PAPR,a new scheme of combining FRFT and PTS is proposed.By replacing FFT with FRFT,the OFDM system reduces its PAPR to some extent.In order to reduce the PAPR much more effectively,a union algorithm of FRFT and PTS is given.Meanwhile,the optimal order of the system,which is 0.006,is selected based on the search algorithm simplified according to the unitarity of FRFT.The simulation results show that when CCDF=10-4,the OFDM system under optimal order can reduce its PAPR by 7 dB,which is 4 dB better than the performance of traditional PTS.

Key words: OFDM, FRFT, PAPR, PTS

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