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Recognition method of M-ary orthogonal amplitude modulation

A technology of quadrature amplitude modulation and identification method, applied in the field of communication, can solve the problems of complex calculation and low identification rate, and achieve the effect of improving the accuracy and reducing the amount of calculation

Inactive Publication Date: 2012-06-27
XIDIAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the low signal-to-noise ratio and Rayleigh channel in the existing MQAM class intra-signal identification field, the identification rate is low, and the calculation is complicated, and a multi-ary quadrature amplitude modulation identification method is proposed. The first-order moment, the fourth-order moment, and the sixth-order moment are combined into a new eigenvector to distinguish the method of the MQAM class signal, so as to realize the identification of the MQAM class signal under the condition of Rayleigh channel and low signal-to-noise ratio, and improve wireless communication. Accuracy and Validity of Transmissions

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  • Recognition method of M-ary orthogonal amplitude modulation
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  • Recognition method of M-ary orthogonal amplitude modulation

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Embodiment Construction

[0024] See figure 1 , The implementation steps of the identification of the multi-ary quadrature amplitude modulation of the present invention are as follows:

[0025] Step 1. Set the received MQAM signal model after passing through the Rayleigh fading channel as:

[0026]

[0027] Where: a(t) and Are the influencing factors of the channel, a(t) obeys the Rayleigh distribution, Obey the uniform distribution between 0 and 2π, f d Is the Doppler factor, w(t) is the mean is zero, and the variance is σ g 2 The complex Gaussian white noise, and s(t) is the transmitted signal:

[0028] s ( t ) = N p X k c k e j 2 π f c t g ( t - kT s )

[0029] Where N p Is the average power of the received signal, c k Is the equivalent baseband symbol sequence of the received signal, T s Is the symbol period, f c Is the carrier frequency, g(t-kT s ) Is the shaped pulse signal g(t) after kT s Shaped pulse signal after delay.

[0030] S...

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Abstract

The invention discloses a recognition method of M-ary orthogonal amplitude modulation, which is mainly used for solving the problems of complicated computational complexity and low recognition rate of the existing recognition way of MQAM within-class signal modulation. The implementation process is as follows: firstly carrying out over-sampling on received signals y(t) for obtaining a sampling sequence y(n), thereby changing continuous signals to discrete signals; calculating values of two-order moment, four-order moment and six-order moment of a received sampling signal y(n); utilizing the values of the two-order moment, the four-order moment and the six-order moment for calculating the combined moment m23; taking a solid part of the combined moment m23 as a feature vector m23 of the received sampled signal; calculating theoretical values m' of the QAM feature vectors of all the orders; calculating the decision threshold of the modulation way through the theoretical values m' of the QAM feature vectors of all the orders; and determining the modulation way of the received signals according to the feature vector m23 of the received sampling signal and the decision threshold of the modulation way. The recognition rate of the method for recognizing the MQAM within-class signals under the environment of a Rayleigh fading channel and low signal to noise ratio can achieve 100% above5dB, thereby being higher than the existing other methods.

Description

Technical field [0001] The invention belongs to the field of communication technology, and relates to a recognition method for multi-ary quadrature amplitude modulation MQAM signals under conditions of Rayleigh fading channel and low signal-to-noise ratio, which should be in automatic pattern recognition AMC. Background technique [0002] Automatic pattern recognition refers to a technology that automatically recognizes the modulation type of the signal by observing and analyzing the data sampled from the received signal under the fading channel. AMC is becoming more and more important for both military and civilian use. For example, in electronic information warfare, signal spectrum monitoring and management, and software radio, it is necessary to determine the modulation mode of the communication signal under the premise of unknown modulation information, and estimate the corresponding modulation Parameters can be demodulated. At present, there are relatively few researches on...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34H04L27/38
Inventor 李兵兵黄敏兰冰李艳玲
Owner XIDIAN UNIV
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