Modulation order recognition method for MQAM signal
A technology of modulation order and identification method, which is applied in the direction of modulation carrier system, digital transmission system, electrical components, etc., can solve the problems of circular QAM signal modulation order identification failure, etc., and achieve good identification effect
Active Publication Date: 2018-01-19
XIDIAN UNIV
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[0003] To sum up, the problem existing in the prior art is that most current QAM signal order identification methods are only limited to square and cross-shaped QAM signals, and the identification of circular QAM signal modulation order will fail.
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[0040] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0041] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0042] Such as figure 1 As shown, the modulation order identification method of the MQAM signal provided by the embodiment of the present invention includes the following steps:
[0043] S101: Perform down-conversion processing on the received MQAM signal to recover the baseband signal, obtain and normalize the constellation diagram, and estimate the probability density function of the constellation diagram by using the grid method;
[0044] S102: Perform image processing on the top ...
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The invention belongs to the technical field of communication signal analysis, and discloses a modulation order recognition method for an MQAM signal. The method comprises the steps: carrying out thedown-conversion processing of a received MQAM signal, restoring a baseband signal, obtaining a constellation diagram, carrying out the normalization, and estimating a probability density function of the constellation diagram through a grid method; carrying out the image processing of the top view of the estimated probability density function of the constellation diagram through gray processing andimproved binarization, and obtaining a simplified probability density function of the constellation diagram; carrying out the processing of the simplified probability density function of the constellation diagram through a multi-radius subtraction clustering and self-correcting clustering effectiveness function, and recognizing the modulation orders of MQAM signals of different types of constellations. The method is good in recognition effect for MQAM signals in different shapes.
Description
technical field [0001] The invention belongs to the technical field of communication signal analysis, and in particular relates to a method for identifying the modulation order of an MQAM signal, which can be used in satellite space communication systems, digital television networks and digital microwave systems. Background technique [0002] QAM signal has high spectrum utilization rate and strong noise tolerance ability, and is widely used in satellite space communication, digital TV network high-speed data transmission, digital microwave system, VDSL and other fields. At present, the digital cable TV standards in Japan, the United States and Europe all use QAM modulation. In the development of communication technology, QAM signals have derived many new constellation diagram types. In the military standard MIL-STD-188-110C Appendix D issued by the US Department of Defense at the end of 2011, a constellation map of circular QAM modulation is proposed. , referred to as 110C...
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IPC IPC(8): H04L27/38H04L27/34H04L27/00
Inventor 李兵兵曲楠刘明骞
Owner XIDIAN UNIV