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A Modulation Recognition Method for Robust Communication Signals
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A communication signal and modulation recognition technology, applied in the direction of adjusting channel coding, digital transmission system, electrical components, etc., can solve the problems of heavy workload, achieve the effect of reducing workload, improving real-time performance, and reducing computational complexity
Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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[0005] In order to solve the problem that the traditional AMR algorithm needs to train multiple recognizers to ensure the effectiveness in a larger SNR range, that is, in the training stage, the recognizers need to be trained separately for different SNR environments, resulting in a huge workload The problem
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specific Embodiment approach 1
[0028] Specific implementation mode one: combine figure 1 Describe this embodiment, a robust communication signal modulation identification method, including the following steps:
[0029] Step 1: Obtain the communication signal sample s(t), perform Wigner-Ville transformation on the communication signal sample s(t), and obtain the time-frequency-energy three-dimensional distribution of the communication signal sample s(t), that is, WVD distributed;
[0030] The WVD of a communication signal sample s(t) is defined as follows:
[0031]
[0032] Among them, τ represents the lag time, t represents the time, ω represents the angular frequency, and j is the basic unit of the imaginary part;
[0033] z(t) is the analytical signal of s(t), defined as:
[0034] z(t)=s(t)+jH[s(t)] (2)
[0035] And H[s(t)] represents the Hilbert transform of s(t), z * (t) represents the conjugate function of function z(t);
[0036] Step 2: According to the WVD distribution of the communication s...
specific Embodiment approach 2
[0048] Specific implementation mode two: the step two concrete steps described in this implementation mode are:
[0049] According to the WVD distribution of the communication signal sample s(t), a binary function is defined in the time-frequency-energy three-dimensional space (t, l, e)
[0050]
[0051] Among them, the reference point r=(t,l,e) T , t, l, e represent the time, frequency and energy of WVD distribution respectively;
[0052] The second-order stereo autocorrelation function in three-dimensional space is
[0053] Among them, α 1 , α 2 Respectively represent different displacement vectors relative to the reference point r, D s Indicates the integration area;
[0054] Since the order of the autocorrelation function N≤2, in the WVD space, α 1 、α 2 In a cube with the reference point r as the center and adjacent points to the reference point r, the second-order stereo autocorrelation function of the three-dimensional space of the communication signal sample s...
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Abstract
The invention discloses a robust communication signal modulation and recognition method and relates to communication signal modulation and recognition methods. The method aims at solving the problem that in order to guarantee validity within a large SNR range, a plurality of recognizers need to be trained through a traditional ARM algorithm, and in other words, the recognizers need to be trained individually for different SNR environments at a training stage and accordingly the workload is huge. The method includes the steps that Wigner-Ville conversion is performed on a communication signal sample s(t) to obtain WVD of the s(t); second-order three-dimensional autocorrelation characteristics are extracted, and a second-order three-dimensional autocorrelation characteristic set is established; selection is performed on the second-order three-dimensional autocorrelation characteristics to form a robust feature set; a first-class support vector unit is established through training, and an output function Yi(x) of the first-class support vector unit is calculated; the possibilities that a communication signal sample to be recognized sx(t) belongs to the various modulation modes included in the communication signal sample s(t) are calculated, and a modulation category with the largest possibility is selected as the final modulation and recognition result. The method is suitable for communication signal modulation and recognition.
Description
technical field [0001] The invention relates to a communication signal modulation identification method. Background technique [0002] With the development of software radio and cognitive radio technology, the research on automatic modulation recognition (Automation Modulation Recognition, AMR) of multi-system communication signals based on feature extraction and pattern recognition has made a lot of progress and achievements, but it still cannot meet the needs of communication signals. There are still many challenges for the practical application of modulation recognition. In particular, the poor promotion ability of AMR has always been an important bottleneck hindering its practical application. In order to solve the problem of poor generalization ability of AMR method and the need for real-time signal-to-noise ratio estimation, this project studies the multi-system communication signal modulation recognition mechanism and method with generalization ability from two aspec...
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