摘要
调制方式识别是构成认知无线电通用接收机和智能调制解调器的重要技术基础,只有正确识别出其他通信系统的调制方式、占用频段、传输带宽等信息,才能合理分配自身的通信频段,采取合理的调制方式进行信号传输。通信信号的识别首先通过认知无线电技术从无线环境中感知对方信号频率并进行截取;其次,对接收的信号进行时域和变换域分析,尤其是时域中的特征参数,包括信号的载波频率、信噪比(Signal to Noise Ratio,SNR)、信元速度等瞬时参数值;最后,通过识别算法区分信号调制类型,接收机根据识别出的信息来调整自身的通信机制,实现与发送方的正常通信。
Modulation recognition is an important technical basis for the general receiver and intelligent modem of cognitive radio.Only by correctly recognizing the modulation mode,occupied frequency band,transmission bandwidth and other information of other communication systems can we reasonably allocate our own communication frequency band and adopt a reasonable modulation mode for signal transmission.Firstly,the frequency of the other party's signal is sensed from the wireless environment by cognitive radio technology and intercepted;Secondly,the received signal is analyzed in time domain and transform domain,especially the characteristic parameters in time domain,including instantaneous parameters such as carrier frequency,Signal to Noise Ratio(SNR)and cell speed.Finally,the signal modulation types are distinguished by the identification algorithm,and the receiver adjusts its communication mechanism according to the identified information to realize normal communication with the sender.
作者
王青龙
韩春昊
王春霞
刘杨美荷
WANG Qinglong;HAN Chunhao;WANG Chunxia;LIU Yangmeihe(The Sixth Research Institute of China Electronic Information Industry Group Inc.,Beijing 100083,China)
出处
《电声技术》
2024年第1期142-145,共4页
Audio Engineering
关键词
调制解调
信号识别
数字通信
参数评估
modulation
signal recognition
digital communication
parameter estimation
