非线性功放条件下的恒包络OFDM系统性能

doi:10.11959/j.issn.1000-0801.2016213

电信科学 ›› 2016, Vol. 32 ›› Issue (9): 120-124.doi: 10.11959/j.issn.1000-0801.2016213

非线性功放条件下的恒包络OFDM系统性能

王清波

中国铁建电气化局集团有限公司，北京 100043

出版日期:2016-09-15 发布日期:2016-10-20

Performance of constant envelope OFDM system with nonlinear power amplifier

Qingbo WANG

China Railway Construction Electrification Bureau Group Co.,Ltd.,Beijing 100043,China

Online:2016-09-15 Published:2016-10-20

摘要/Abstract

摘要：

正交频分复用技术具有较高的频谱效率和好的抗频率选择性衰落性能，被广泛应用于无线通信系统中。但是OFDM信号具有较高的峰均比，当系统采用非线性功放时，OFDM系统需要较大的输入功率回退以避免信号失真。为了研究非线性功放条件下的系统性能，分析了恒包络OFDM系统的实现方式，并以误码率为指标，在加性高斯白噪声信道和多径衰落信道场景下对比了恒包络OFDM系统与采用传统迭代限幅滤波PAPR抑制技术的OFDM系统的性能。

关键词: 非线性功放, 恒包络OFDM, 峰均比

Abstract:

Orthogonal frequency division multiplexing technology is widely used in wireless communication system due to its high spectral efficiency and good resistance ability to frequency selective fading.But it has high peak-to-average power ratio.Therefore,OFDM system needs large input power back-off to avoid signal distortion when using nonlinear power amplifier.In order to study the performance of the system under the condition of nonlinear power amplifier,the implementation of constant envelope OFDM was analyzed.Taking bit error rate as an index,the performance comparison between CE-OFDM system and OFDM system using traditional iterative limiting filter PAPR suppression technology were given under additive white Gaussian noise channel and multipath fading channel.

Key words: nonlinearpoweramplifier, constantenvelopeOFDM, PAPR

王清波. 非线性功放条件下的恒包络OFDM系统性能[J]. 电信科学, 2016, 32(9): 120-124.

Qingbo WANG. Performance of constant envelope OFDM system with nonlinear power amplifier[J]. Telecommunications Science, 2016, 32(9): 120-124.

图/表 6

图1

图2

表1

仿真参数假设"

类别	参数名称	符号	参数值
功放参数	功放增益	g₀	1
	功放饱和点/dB	A_sat	0
	SSPA(AM/AM参数)	p	2
	TWTA(AM/PM参数)	α_φ、β_φ	$\frac{π}{12}$ 、 $\frac{1}{4}$
CE-OFDM	调制类型	QPSK	QPSK
系统参数	信号幅度	A	1
	调制指数	h	0.3、0.5、0.7
	调制符号数	N	31
	符号长度(不包含前缀)/μs	T_B	64
	IDFT点数	N_idft	1 024
	采样频率/MHz	F_sa	16
	循环前缀	N_cp	16
	过采样因子	C_os	16
OFDM	目标PAPR	T_PAPR	3、5
系统参数	迭代次数	迭代次数	16

表1

表2

图3

图4

多径序号	时延/ns	平均功率/dB
1	0	0
2	110	-9.7
3	190	-19.2
4	410	-22.8

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非线性功放条件下的恒包络OFDM系统性能

Performance of constant envelope OFDM system with nonlinear power amplifier

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