一种改进的基于FFT/IFFT预留子载波的PAPR抑制算法

广西师范大学学报（自然科学版） ›› 2014, Vol. 32 ›› Issue (3): 6-11.

一种改进的基于FFT/IFFT预留子载波的PAPR抑制算法

贺冬冬, 李传起

广西师范大学电子工程学院,广西桂林541004

收稿日期:2014-06-10 出版日期:2014-09-25 发布日期:2018-09-25
通讯作者: 李传起(1964—),男,安徽六安人,广西师范大学教授,博士。E-mail:lcq@gxnu.edu.cn
基金资助:
广西高校自然科学基金重点项目(201202ZD010); 桂林市科学研究与技术开发计划课题(20120104-18)

An Improved Tone Reservation Algorithm Based on FFT/IFFT for PAPR Reduction

HE Dong-dong, LI Chuan-qi

College of Electronic Engineering, Guangxi Normal University, Guilin Guangxi 541004, China

Received:2014-06-10 Online:2014-09-25 Published:2018-09-25

摘要/Abstract

摘要： 在正交频分复用(OFDM)系统中高峰均功率比(PAPR)将会引起信号的畸变,使系统的误码性能严重下降。预留子载波算法(TR)能降低高峰均功率比(PAPR),但是具有较高的复杂度,基于FFT/IFFT的预留子载波法能很好地降低其复杂度,但PAPR抑制效果还有待提高,并且放大系数较大时会导致误码率性能发生一定程度的恶化。为了更有效地抑制OFDM系统的PAPR,本文提出了一种改进的基于FFT/IFFT预留子载波的PAPR抑制算法,该算法通过用不同的修正相位序列乘以预留子载波上的削峰信号,与数据信号相加后得到多组备选信号,再从中选择一组PAPR最小的信号进行发送。仿真结果表明,在不增加计算复杂度的情况下,与原算法相比,改进算法能够获得4 dB左右的PAPR性能增益。

关键词: 正交频分复用, 峰均功率比, 预留子载波, 修正相位序列

Abstract: In OFDM systems, signals with a large PAPR may bring serious distortions, resulting in dramatic reduction of system BER performance. Tone reservation scheme can reduce the PAPR, but has a high computational complexity, Tone reservation method based on FFT/IFFT can reduce computational complexity, but can’t suppress the PAPR effectively and the lager amplification factor deteriorates BER performance. An improved tone reservation method based on FFT/IFFT is proposed to restrain the high PAPR. The reserved subcarrier’s peak cancelling signal is multiplied by different correction phase sequences and the signal with minimum PAPR among these alternative signals is selected to transmit. Simulation results show that, compared with the original algorithm, the proposed method can provide about 4dB PAPR performance gains with comparable computational complexity.

Key words: OFDM, PAPR, tone reservation, correction phase sequence

中图分类号:

TN929.5

贺冬冬, 李传起. 一种改进的基于FFT/IFFT预留子载波的PAPR抑制算法[J]. 广西师范大学学报（自然科学版）, 2014, 32(3): 6-11.

HE Dong-dong, LI Chuan-qi. An Improved Tone Reservation Algorithm Based on FFT/IFFT for PAPR Reduction[J]. Journal of Guangxi Normal University(Natural Science Edition), 2014, 32(3): 6-11.

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