利用改进时频分析算法检测TWACS调制信号  

Detecting TWACS modulated signals using improved time-frequency analysis algorithm

作　　者：赵永平[1] 杨硕[1] 许鹏[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《哈尔滨工业大学学报》2007年第3期471-473,480,共4页Journal of Harbin Institute of Technology

摘　　要：在双向工频自动通信系统(TWACS)应用中,传统的时域检测方法由于提取的信号特征有限,在强噪声条件下无法进一步提高检测的正确率.为此,从频域滤波的角度给出了一种新的改进时频分析算法,该算法具有较高的时频分辨率和交叉项抑制能力,并且有很高的计算效率,可满足TWACS通讯的实时性要求.采用改进时频分析算法对实际电网信号分析的结果表明:该方法能够高效、准确地实现TWACS调制信号的检测.can not be due to the In Two Way Automation Communication System （TWACS） applications, the detecting accuracy improved in the environment with strong noise using the traditional time-domain detection algorithm characteristic limitation of the detected signal. A new improved time-frequency analysis algorithm is of the frequency-domain filtering. This algorithm has a high time-frequency resolution and can reduce or even completely remove the cross-term. More importantly, the algorithm has an excellent com- putation efficiency to meet the requirement of the real-time working of the TWACS. After detecting and analyzing the actual signal from the power distribution network, the results shows that the algorithm can detect the TWACS modulated signals efficiently and correctly.

关 键 词：TWACS 时频分析 频域滤波 交叉项抑制 

分 类 号：TN915[电子电信—通信与信息系统]