基于改进变分模态分解的电力线宽带载波通信干扰耦合协同抑制方法

doi:10.11959/j.issn.1000-0801.2023084

摘要/Abstract

摘要：

电力线宽带载波通信干扰耦合加重了子载波间的频域拖尾，降低了抑制方法的敏感性，通信质量较差，对此，提出了基于改进变分模态分解的电力线宽带载波通信干扰耦合协同抑制方法。以电力线宽带载波通信的信道特性为基础，建立了存在多径传播和多普勒效应的通信信道模型，模拟发出通信信号，利用改进变分模态分解算法预处理原始信号，将抑制问题转化为变分问题，同时以非约束性变分问题的离散形式表示信号，对变分问题不断更新，完成对信号的分离处理，实现对通信干扰的协同抑制。实验结果表明，所提方法在应用过程中，误比特率低、频率偏移小，抑制过程的敏感性得到了提高，具有实际应用价值。

关键词: 变分模态分解, 电力线带宽, 载波通信, 干扰, 耦合, 协同抑制

Abstract:

The interference coupling of power line broadband carrier communication aggravates the frequency domain tailing between subcarriers, reduces the sensitivity of suppression methods, and the communication quality is poor.Therefore, a cooperative suppression method of interference coupling of power line broadband carrier communication based on improved variational modal decomposition was proposed.Based on the channel characteristics of power line broadband carrier communication, a communication channel model with multipath propagation and Doppler effect was established, the communication signal was simulated, the original signal was preprocessed by using the improved variational modal decomposition algorithm, and the suppression problem was transformed into a variational problem.At the same time, the signal was expressed in the discrete form of unconstrained variational problem.The variational problem was continuously updated to complete the separation and processing of the signal, and realize the cooperative suppression of communication interference.The experimental results show that the proposed method has low bit error rate, small frequency offset, and practical application value.

Key words: variational modal decomposition, power line bandwidth, carrier communication, interference, coupling, cooperative suppression

中图分类号:

TM73

董丹丹, 孙宁. 基于改进变分模态分解的电力线宽带载波通信干扰耦合协同抑制方法[J]. 电信科学, 2023, 39(5): 129-135.

Dandan DONG, Ning SUN. Interference coupling cooperative suppression method for wideband carrier communication based on improved variational mode decomposition[J]. Telecommunications Science, 2023, 39(5): 129-135.

图/表 4

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编号	相关参数	参数值
1	子载波数	64
2	FFT点数	128
3	信道多径数	8
4	最大多普勒频移	50 Hz
5	载波频率	900 MHz
6	有效距离理论值	1 km
7	子载波间隔	15 kHz
8	循环前缀	16
9	调制方式	BPSK
10	相关编码	1-D