Detecting and analyzing method for multi system frequency shift key control signal
Title：
Detecting and analyzing method for multi system frequency shift key control signal
Application Number：
 200610114085
Application Date：
 2006/10/27
Announcement Date：
 2007/04/11
Pub. Date：
Publication Number：
 1946069
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 H04L 27/10, H04L 27/14, H04L 27/156, H04B 17/00
Applicant(s)：
 Tsinghua univ.
Inventor(s)：
 Zou Hongxing, Yu Lijie, Wang Pu
Key Words：
 multi system frequency shift key, control signal, detecting and analyzing
Abstract：
 This invention relates to automatic identification to communication signals and analysis technology aiming at testing and analyzing multi-bit frequency shift key controlled signals characterizing in comparing the mean value of the absolute value of the variance rate sequence of the normalized instant frequencies with the set threshold value to judge MFSK signal, when analyzing, Smooth filtration is used in reducing shake of the MFSK signal transient frequency then the entropy principle is used in analyzing the histogram for the distribution of transient frequencies to estimate the state number of code elements and frequency sphere with an equal probability distribution principle then to use the equal frequency distance to get more accurate code element state number, frequency sphere and central frequency.
Claim：
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PCT：
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