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一种基于位同步的复杂调制样式识别方法
解辉,马俊涛,姚智刚,吕萌,尹园威
0
(陆军工程大学石家庄校区 电子与光学工程系,石家庄 050003)
摘要:
针对卫星数字化视频广播第二代标准(Digital Video Broadcasting-Satellite -Second Generation,DVB-S2)中的多进制幅度移相键控(Multiple Amplitude and Phase-Shift Keying,MAPSK)和多进制正交幅度调制(Multiple Quadrature Amplitude Modulation,MQAM)信号的调制识别,提出了基于位同步的识别方法。首先利用信号星座图特征对信号包络进行位同步,然后统计信号码元的幅度值个数及其幅度值分布提取统计特征参数,最后利用特征参数完成识别。仿真结果表明,所提算法在载波频率等参数未知的条件下,能够有效对信号进行调制识别。
关键词:  DVB-S2  MAPSK  MQAM  调制识别  位同步
DOI:
基金项目:国防科技基金资助项目(2004022)
A complex modulation pattern recognition method based on bit synchronization
XIE Hui,MA Juntao,YAO Zhigang,LYU Meng,YIN Yuanwei
(Department of Electronic and Optics Engineering,Army Engineering University Shijiazhuang Campus,Shijiazhuang 050003,China)
Abstract:
For modulation recognition of multiple amplitude and phase-shift keying(MAPSK) and multiple quadrature amplitude modulation(MQAM) signals in digital video broadcasting-satellite-second generation(DVB-S2) standard,a method based on bit synchronization is proposed.Firstly,the signal constellation features are used to do bit synchronization for the signal envelope.Then,the number and distribution of amplitude values of signal number elements are counted,and the statistical characteristic parameters are extracted.Finally,the recognition is completed by using the characteristic parameters.Simulation results show that the proposed algorithm is effective in modulation recognition of signals under unknown carrier frequency and other parameter conditions.
Key words:  DVB-S2  MAPSK  MQAM  modulation recognition  bit synchronization
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