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

Abstract

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

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.

Figures/Tables 12

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	$K M lb M + K L M + M L lb M N + \frac{{(P - 1)}^{2} + 2}{2} M N$

References 16

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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

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

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