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A Constellation Diagram Type Recognition Method for MQAM Signals

A technology of type identification and constellation diagram, applied in modulation type identification, digital transmission system, multi-carrier system, etc.

Active Publication Date: 2020-03-31
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] To sum up, the problem existing in the existing technology is that most scholars’ research on the identification of MQAM signals is limited to the identification of the modulation order (that is, the modulation mode), and does not involve the identification of the constellation diagram type. Therefore, in MQAM Blind demodulation of signals requires some prior information

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  • A Constellation Diagram Type Recognition Method for MQAM Signals
  • A Constellation Diagram Type Recognition Method for MQAM Signals
  • A Constellation Diagram Type Recognition Method for MQAM Signals

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Embodiment Construction

[0028] 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.

[0029] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] Such as figure 1As shown, the constellation diagram type identification method of the MQAM signal provided by the embodiment of the present invention includes the following steps:

[0031] 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;

[0032] S102: Construct a cost function based on the improved Rado...

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Abstract

The invention belongs to the technical field of the communication signal analysis, and discloses a constellation diagram type recognition method of a MQAM signal. The method comprises the following steps: firstly performing a down-conversion processing on the received MQAM signal to recover a baseband signal, obtaining a constellation diagram and normalizing, and estimating the probability density function of the constellation diagram; constructing a cost function based on the improved Radon conversion, and performing angular correction on the probability density function of the constellation diagram; and finally constructing the feature function of the constellation diagram probability density function; comparing the in-ring density and the in-circle density of the feature function with the judgment threshold to recognize the constellation diagram type of the MQAM signal. By using the recognition method disclosed by the invention, the recognition of different constellation diagram types of the MQAM signal can be realized.

Description

technical field [0001] The invention belongs to the field of communication signal analysis technology, digital television network and digital microwave system, and in particular relates to a constellation diagram type identification method of MQAM signal. 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 (Wu Tianlin. MIL-STD-188-110C high-order QAM signal demodu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/38H04L27/34H04L27/00
CPCH04L27/0012H04L27/3483H04L27/38
Inventor 刘明骞郑诗斐曲楠
Owner XIDIAN UNIV