基于单载波频域均衡的直接序列扩频自适应抗干扰技术

doi:10.11959/j.issn.1000-436x.2022213

Abstract

Abstract:

To solve the performance limitation of direct sequence spread spectrum system in complex multipath environment, an adaptive anti-jamming spread spectrum framework that organically combines single carrier frequency domain equalization (SCFDE) and direct sequence spread spectrum (DSSS) technologies was proposed.The frequency multipath fading was overcame by frequency domain equalization, and the transmission rates and high reliability was reconfigured by deploying variable spread factors.Moreover, the inherent fast Fourier transform process was made full use at the receiver to realize the adjoint detection and analysis of interference intensity, interference type and other information, etc.Then, the frequency domain bearing point online was optimized and selected to improve the adaptability to the interference, especially blocking interference.The simulation results show that the proposed direct spread spectrum waveform based on SCFDE has good communication performance in both Gaussian and multipath environments, and the notch of some frequency bands has little impact on the communication performance, which verifies the effectiveness of anti-jamming by adaptive optimizing information frequency domain bearers.

Key words: direct sequence spread spectrum, frequency domain equalization, adaptive, anti-jamming

CLC Number:

TN929.5

Fanglin GU, Yuzhen HUANG, Ying ZHAO, Haitao ZHAO, Jibo WEI. Adaptive anti-jamming technologies based on direct sequence spread spectrum and single carrier frequency domain equalization[J]. Journal on Communications, 2022, 43(11): 26-34.

Figures/Tables 16

TH	p
$\frac{1}{λ}$	63.20%
$\frac{2}{λ}$	86.50%
$\frac{3}{λ}$	95.10%
$\frac{4}{λ}$	98.20%
$\frac{5}{λ}$	99.30%

参数	取值
信道带宽/MHz	12.8
FFT/IFFT点数	2 048
扩频倍数	16、32、64、128
数据块符号	128、64、32、16
调制方式	QPSK
信道编码	Turbo
编码效率	$\frac{1}{3}$

References 11

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[10]	宫丰奎, 文妮, 李果 ,等. 基于CAZAC序列的低复杂度抗频偏同步算法[J]. 通信学报, 2021,42(2): 64-71.
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参数	取值
信道类型	IEEE 802.11g
采样频率/MHz	51.2
最大多普勒频移f_d/Hz	10、100
多径信道的平均时延/ns	20

Adaptive anti-jamming technologies based on direct sequence spread spectrum and single carrier frequency domain equalization

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Figures/Tables 16

References 11

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有效带宽/kHz	扩频倍数	数据块符号	FFT点数	扩频处理增益/dB	接收机灵敏度/dBm
100	128	16	2 048	21	-118
200	64	32	2 048	18	-115
400	32	64	2 048	15	-112
800	16	128	2 048	12	-109

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