摘要
信号调制样式识别广泛应用于软件无线电和通信信号的侦察与检测,其中基于决策论的识别方法是实际应用中的主要方法。信号特征提取是识别过程的关键部分。信号的瞬时相位特征与其它特征相比最容易受噪声影响。相位插补技术主要用于解决因弱信号段而产生的相位信息缺失的问题。为了不丢弃弱信号段,软件上可以使用外推的方法根据非弱信号段相位推导出弱信号段的相位值,并插入到缺失的相位信息中。文中对OOK(通断键控)信号在表示符号零时无相位值的问题,应用相位插补技术加以解决并给出了仿真应用实例。
In software radio and signal detection areas,the automatic identification of digital modulation has been widely used. Decision - theory approach is one of the most important approaches. Feature extraction is the key part of identification. The instant phase feature of signal, to be affected, is easily by noise. Interpolation technique is used to solve the problem of phase information missing generated by weak sequence signal. In order to recover the information of weak signal segment, we can use extrapolation to deduce the phase value of weak signal segment according to the normal segment. Then we can insert the recovered information to the correct position of phase segment. The paper presents an example of applying the interpolation technique to solve the problem that the OOK signal have no phase value when we use it to transmit the symbol zero, and then offers a practical simulation case.
出处
《计算机仿真》
CSCD
2005年第12期297-299,共3页
Computer Simulation
关键词
调制识别
特征提取
软件无线电
Modulation identification
Feature extract
Software radio
