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投稿时间：2012-06-20 修订日期：2012-12-05
投稿时间：2012-06-20 修订日期：2012-12-05
中文摘要: 为解决传统二进制频移键控（2FSK）技术不适应低压电力线（LPLC）信道频率选择性衰落特性的问题，结合离散短时傅立叶变换（DSTFT）和高阶矩理论，提出一种新的可用于时频分析的信噪比估计算法，在此基础上实现了基于时频分析的多载波2FSK信号的数字化解调。仿真结果表明信噪比估计精度可满足LPLC通信的实际需求，且在相同噪声干扰情况下，多载波系统的误码率明显低于单载波系统。
Abstract:The traditional binary frequency shift keying (2FSK) technology cannot adapt to the attenuation characteristic of low-voltage power line carrier (LPLC) channel.In order to solve this problem, by using discrete short time Fourier transform and high-order moments theory,a novel signal-to-noise estimation algorithm,which can be used in time-frequency analysis,was proposed. Based on it,a multi-carrier binary frequency shift keying technique based on time-frequency analysis was implemented.Simulation results showed that the precision of the SNR estimation could meet the need of the LPLC communication system in practice and the multi-carrier system gains lower error rate than the single-carrier system while they are interfered by the same noise.
keywords: frequency shift keying discrete short time Fourier transform power line carrier communication signal-to-noise ratio estimation high-order moments
文章编号：201200469 中图分类号： 文献标志码：
基金项目:国家自然科学基金资助项目（60873186;61170147）；福建省教育厅科技项目（JA12024)；厦门科技计划资助项目（3502Z20123013）
| Author Name | Affiliation |
| Xu Yiwen | School of Physics and Info. Eng.,Fuzhou Univ. |
| Chen Zhonghui | School of Physics and Info. Eng.,Fuzhou Univ. |
| Wang Weixing | School of Physics and Info. Eng.,Fuzhou Univ. |
作者简介:
引用文本：
徐艺文,陈忠辉,王卫星.基于时频分析的多载波2FSK技术在LPLC通信中的应用[J].工程科学与技术,2013,45(1):158-163.
Xu Yiwen,Chen Zhonghui,Wang Weixing.Multi-carrier 2FSK Technology Based on Time-frequency Analysis for LPLC Communication[J].Advanced Engineering Sciences,2013,45(1):158-163.
引用文本：
徐艺文,陈忠辉,王卫星.基于时频分析的多载波2FSK技术在LPLC通信中的应用[J].工程科学与技术,2013,45(1):158-163.
Xu Yiwen,Chen Zhonghui,Wang Weixing.Multi-carrier 2FSK Technology Based on Time-frequency Analysis for LPLC Communication[J].Advanced Engineering Sciences,2013,45(1):158-163.