基于时频分析的多载波2FSK技术在LPLC通信中的应用  

Multi-carrier 2FSK Technology Based on Time-frequency Analysis for LPLC Communication

作　　者：徐艺文[1] 陈忠辉[1] 王卫星[1] 

机构地区：[1]福州大学物理与信息工程学院,福建福州350108

出　　处：《四川大学学报（工程科学版）》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)

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.

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 

分 类 号：TN76[电子电信—电路与系统]