GFDM系统中基于随机滤波器分配的降低PAPR算法

doi:10.11959/j.issn.1000-0801.2016239

电信科学 ›› 2016, Vol. 32 ›› Issue (9): 36-43.doi: 10.11959/j.issn.1000-0801.2016239

GFDM系统中基于随机滤波器分配的降低PAPR算法

张苗,谢显中,吴垒,雷维嘉

重庆邮电大学个人通信研究所，重庆 400065

出版日期:2016-09-15 发布日期:2016-10-20
基金资助:
国家自然科学基金资助项目;国家自然科学基金资助项目;国家自然科学基金资助项目;重庆市教委科学技术研究项目资助课题;重庆市教委科学技术研究项目资助课题;长江学者和创新团队发展计划基金资助项目;重庆市科委重点实验室专项经费(CSTC)资助项目

Algorithm based on randomly assigning filters to reduce PAPR in GFDM system

Miao ZHANG,Xianzhong XIE,Lei WU,Weijia LEI

Institute of Personal Communications,Chongqing University of Posts and Telecommunications,Chongqing 400065,China

Online:2016-09-15 Published:2016-10-20
Supported by:
The National Natural Science Foundation of China;The National Natural Science Foundation of China;The National Natural Science Foundation of China;The Research Project of Chongqing Education Commission;The Research Project of Chongqing Education Commission;The Program for Changjiang Scholars and Innovative Research Team in University;The Special Fund of Chongqing Key Laboratory(CSTC)

摘要/Abstract

摘要：

广义频分复用(GFDM)作为5G 的备选波形，具有很多OFDM 所没有的优点，但是依然具有较高的峰值平均功率比(PAPR)。从不同滤波器的相频特性不同入手，提出了一种新的降低GFDM 系统PAPR 的算法(RAF-GFDM)。该方法根据GFDM系统可以灵活选择滤波器结构的特点，通过对每路子载波随机分配不同的滤波器，调整信号叠加时的相位一致性，且不引起信号的畸变，从而有效抑制PAPR。理论分析和仿真结果证实，提出的算法在降低PAPR时没有增加额外的计算成本，且对误比特率(BER)几乎没有影响，因此具有更高的实际应用价值。

关键词: 广义频分复用, RAF-GFDM, 峰值平均功率比, 随机分配滤波器, 误比特率

Abstract:

As an alternative of the fifth generation mobile communication system waveforms,generalized frequency division multiplexing(GFDM)which has more advantages over OFDM has been trusted into the limelight.Nevertheless,GFDM still suffers from a high peak to average power ratio(PAPR).Considering that different filters have their own phase-frequency characteristics,a new algorithm based on randomly assigning filters to reduce PAPR in GFDM(RAF-GFDM)was proposed.According to the feature of GFDM system that the filter structure could be selected flexibly,different filters were assigned to subcarriers randomly to adjust the phase congruency due to signals superimposition.Additionally,this method can suppress PAPR effectively without causing signal distortion.Theoretical analysis and simulation results demonstrate that the proposed algorithm does not bring additional calculation costs while reducing PAPR and almost has no effect on the bit error rate(BER),and it may provide a higher application value.

Key words: GFDM, RAF-GFDM, PAPR, randomlyassignfilter, BER

张苗,谢显中,吴垒,雷维嘉. GFDM系统中基于随机滤波器分配的降低PAPR算法[J]. 电信科学, 2016, 32(9): 36-43.

Miao ZHANG,Xianzhong XIE,Lei WU,Weijia LEI. Algorithm based on randomly assigning filters to reduce PAPR in GFDM system[J]. Telecommunications Science, 2016, 32(9): 36-43.

图/表 12

图1

图2

图3

表1

不同调制类型发送端运算复杂度比较"

调制类型	复杂度
OFDM	MNlbN
传统GFDM	KMlbM+KLM+MNlbMN
RAF-GFDM	KMlbN+KLM+MNlbMN
clipped-GFDM	KMlbM+KLM+MNlbMN
SLM-GFDM	Q(KMlbM+KLM+MNlbMN)
PCT-GFDM	$K M lb M + K L M + M L lb M N + \frac{{(P - 1)}^{2} + 2}{2} M N$

表1

表2

图4

图

图7

图

图9

图10

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参数类型	参数	数值
子载波数	K	128
时隙数	M	5
成型滤波器	g	{RC、RRC}
滚降系数(roll-off)	α	{0.1、0.5、0.9}
调制方式	μ	2(QAM)
重叠子载波数	L	2
限幅率	CR	1 dB
压缩指令	P	30
计算次数(SLM)	Q	8

GFDM系统中基于随机滤波器分配的降低PAPR算法

Algorithm based on randomly assigning filters to reduce PAPR in GFDM system

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