电讯技术2017，Vol.57Issue(8)：896-902,7.DOI:10.3969/j.issn.1001-893x.2017.08.008
一种改进的BPSK/QPSK信号调制识别算法
An Improved Modulation Recognition Algorithm for BPSK/QPSK Signals
摘要
Abstract
A modulation recognition algorithm based on the feature of order statistics is proposed for binary phase shift keying/quadrature phase shift keying( BPSK/QPSK) signals. The spectrum of squaring trans-formation of the observed signal is calculated by using discrete Fourier transform( DFT) . Consequently,the modified spectrum is obtained by removing the maximum value of the magnitude spectrum. The maximum value of the modified spectrum is defined as the recognition feature. By comparing the recognition feature with a threshold which is set based on the constant false alarm rate( CFAR) criterion,BPSK or QPSK signal can be identified. Computer simulation results show that the proposed algorithm has a good performance to discrminate the BPSK or QPSK signal under moderate signal-to-noise ratio( SNR) . The average recogni-tion accuracy is greater than 90% when the SNR is above 1 dB.关键词
BPSK/QPSK信号/调制识别/顺序统计量/恒虚警准则Key words
BPSK/QPSK signal/modulation recognition/order statistic/constant false alarm rate(CFAR) criterion分类
信息技术与安全科学引用本文复制引用
杨莉,胡国兵..一种改进的BPSK/QPSK信号调制识别算法[J].电讯技术,2017,57(8):896-902,7.基金项目
江苏省自然科学基金资助项目(BK20161104) （BK20161104）
江苏省六大人才高峰(DX022) （DX022）
金陵科技学院高层次人才引进项目(jit-b-2016-30) （jit-b-2016-30）
