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。
The traditional binary frequency shift keying （2FSK） technology cannot adapt to the attenuation characteristic of low-vohage 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.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2013年第1期158-163,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
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)
关键词
频移键控
离散短时傅立叶变换
电力线载波通信
信噪比估计
高阶矩
frequency shift keying
discrete short time Fourier transform
power line carrier communication
signal-to-noise ratio estimation
high-order moments
